Commit Graph

201239 Commits

Author SHA1 Message Date
Anatolij Gustschin 12b15e8328 of/spi: call of_register_spi_devices() from spi core code
Move of_register_spi_devices() call from drivers to
spi_register_master(). Also change the function to use
the struct device_node pointer from master spi device
instead of passing it as function argument.

Signed-off-by: Anatolij Gustschin <agust@denx.de>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-30 00:03:59 -06:00
Grant Likely 559e2b7ee7 of: Provide default of_node_to_nid() implementation.
of_node_to_nid() is only relevant in a few architectures.  Don't force
everyone to implement it anyway.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-30 00:03:58 -06:00
Grant Likely c660122538 of/device: Make of_device_make_bus_id() usable by other code.
The AMBA bus should also use of_device_make_bus_id() when populating device
out of device tree data.  This patch makes the function non-static, and
adds a suitable prototype in of_device.h

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-30 00:03:58 -06:00
Grant Likely d2f718398a of/irq: Fix endian issues in parsing interrupt specifiers
This patch fixes some instances where interrupt specifiers are
dereferenced directly instead of doing a be32_to_cpu() conversion first.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-24 16:51:52 -06:00
Grant Likely 9a6b2e588c of: Fix phandle endian issues
The flat tree code wasn't fixing the endianness on phandle values when
unflattening the tree, and the code in drivers/of wasn't always doing a
be32_to_cpu before trying to dereference the phandle values.  This patch
fixes them.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-24 16:51:52 -06:00
Stuart Yoder 883c2cfc8b of/flattree: fix of_flat_dt_is_compatible() to match the full compatible string
With the current string comparison, a device tree compatible of "foo-bar"
would match as compatible with a driver looking for "foo".  This patch
fixes the function to use the of_compat_cmp() macro so that it does the
right thing on all platforms (If sparc ever uses this code, it will still
want the strncasecmp() behaviour).

Signed-off-by: Stuart Yoder <stuart.yoder@freescale.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-24 16:51:51 -06:00
Jonas Bonn c0dd394ca5 of: remove of_default_bus_ids
This list used was by only two platforms with all other platforms defining an
own list of valid bus id's to pass to of_platform_bus_probe.  This patch:

i)   copies the default list to the two platforms that depended on it (powerpc)
ii)  remove the usage of of_default_bus_ids in of_platform_bus_probe
iii) removes the definition of the list from all architectures that defined it

Passing a NULL 'matches' parameter to of_platform_bus_probe is still valid; the
function returns no error in that case as the NULL value is equivalent to an
empty list.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
[grant.likely@secretlab.ca: added __initdata annotations, warn on and return error on missing match table, and fix whitespace errors]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-24 09:58:22 -06:00
Jonas Bonn c608558407 of: make of_find_device_by_node generic
There's no need for this function to be architecture specific and all four
architectures defining it had the same definition.  The function has been
moved to drivers/of/platform.c.

Signed-off-by: Jonas Bonn <jonas@southpole.se>
[grant.likely@secretlab.ca: moved to drivers/of/platform.c, simplified code, and added kerneldoc comment]
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>
2010-07-24 09:58:22 -06:00
Grant Likely de48e369e8 microblaze: remove references to of_device and to_of_device
of_device is just a #define alias to platform_device.  This patch
replaces all references to it with platform_device.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-24 09:58:22 -06:00
Grant Likely cd4cd7306a sparc: remove references to of_device and to_of_device
of_device is just a #define alias to platform_device.  This patch
replaces all references to it with platform_device.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>
2010-07-24 09:58:22 -06:00
Grant Likely a454dc5059 powerpc: remove references to of_device and to_of_device
of_device is just a #define alias to platform_device.  This patch
replaces all references to it with platform_device.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-24 09:58:21 -06:00
Grant Likely 94a0cb1fc6 of/device: Replace of_device with platform_device in includes and core code
of_device is currently just an #define alias to platform_device until it
gets removed entirely.  This patch removes references to it from the
include directories and the core drivers/of code.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>
2010-07-24 09:58:21 -06:00
Grant Likely c1b6d380b7 of/device: Protect against binding of_platform_drivers to non-OF devices
There is an unlikely chance of this situation is occurring, but it is
easy to protect against.  If a matching entry cannot be found in the
of_match_table, then don't bind the driver.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2010-07-24 09:57:53 -06:00
Grant Likely 2959604296 of: remove asm/of_device.h
It is mostly unused now.  Sparc has a few defines left in it, but they
can be moved to other headers.  Removing this header means that new
architectures adding CONFIG_OF support don't need to also add this
header file.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>
2010-07-24 09:57:52 -06:00
Grant Likely 129ac799ad of: remove asm/of_platform.h
Only thing left in it is of_instantiate_rtc() which can be moved to
asm/prom.h on PowerPC and is unused in microblaze.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>
2010-07-24 09:57:52 -06:00
Grant Likely 1ab1d63a85 of/platform: remove all of_bus_type and of_platform_bus_type references
Both of_bus_type and of_platform_bus_type are just #define aliases
for the platform bus.  This patch removes all references to them and
switches to the of_register_platform_driver()/of_unregister_platform_driver()
API for registering.

Subsequent patches will convert each user of of_register_platform_driver()
into plain platform_drivers without the of_platform_driver shim.  At which
point the of_register_platform_driver()/of_unregister_platform_driver()
functions can be removed.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>
2010-07-24 09:57:52 -06:00
Grant Likely eca3930163 of: Merge of_platform_bus_type with platform_bus_type
of_platform_bus was being used in the same manner as the platform_bus.
The only difference being that of_platform_bus devices are generated
from data in the device tree, and platform_bus devices are usually
statically allocated in platform code.  Having them separate causes
the problem of device drivers having to be registered twice if it
was possible for the same device to appear on either bus.

This patch removes of_platform_bus_type and registers all of_platform
bus devices and drivers on the platform bus instead.  A previous patch
made the of_device structure an alias for the platform_device structure,
and a shim is used to adapt of_platform_drivers to the platform bus.

After all of of_platform_bus drivers are converted to be normal platform
drivers, the shim code can be removed.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: David S. Miller <davem@davemloft.net>
2010-07-24 09:57:51 -06:00
Grant Likely 05212157e9 drivercore/of: Add OF style matching to platform bus
As part of the merge between platform bus and of_platform bus, add the
ability to do of-style matching to the platform bus.

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
CC: Michal Simek <monstr@monstr.eu>
CC: Grant Likely <grant.likely@secretlab.ca>
CC: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: Stephen Rothwell <sfr@canb.auug.org.au>
CC: linux-kernel@vger.kernel.org
CC: microblaze-uclinux@itee.uq.edu.au
CC: linuxppc-dev@ozlabs.org
CC: devicetree-discuss@lists.ozlabs.org
2010-07-24 09:57:51 -06:00
Grant Likely 4e4f62bf73 Merge commit 'v2.6.35-rc6' into devicetree/next
Conflicts:
	arch/sparc/kernel/prom_64.c
2010-07-24 09:49:13 -06:00
Linus Torvalds b37fa16e78 Linux 2.6.35-rc6 2010-07-22 12:13:38 -07:00
Linus Torvalds 27efd7e2e6 Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: synaptics - relax capability ID checks on newer hardware
  Input: twl40300-keypad - fix handling of "all ground" rows
  Input: gamecon - reference correct pad in gc_psx_command()
  Input: gamecon - reference correct input device in NES mode
  Input: w90p910_keypad - change platfrom driver name to 'nuc900-kpi'
  Input: i8042 - add Gigabyte Spring Peak to dmi_noloop_table
  Input: qt2160 - rename kconfig symbol name
2010-07-22 11:46:15 -07:00
Linus Torvalds 84d4db0e22 Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/radeon/kms: add quirk to make HP DV5000 laptop resume
  drm/radeon/kms: fix RADEON_INFO_CRTC_FROM_ID info ioctl
  Fix ttm_page_alloc.c build breakage
  drm/radeon/kms: fix legacy LVDS dpms sequence
  drm/radeon/kms: drop taking lock around crtc lookup.
2010-07-22 11:45:57 -07:00
Linus Torvalds 38ea6e62d3 Merge git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  crypto: talitos - fix bug in sg_copy_end_to_buffer
2010-07-22 11:45:23 -07:00
Linus Torvalds 2851785deb Merge branch 'x86/auditsyscall' of git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland
* 'x86/auditsyscall' of git://git.kernel.org/pub/scm/linux/kernel/git/frob/linux-2.6-roland:
  x86: auditsyscall: fix fastpath return value after reschedule
2010-07-22 11:45:02 -07:00
Linus Torvalds e916beab22 Merge branch 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb
* 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb:
  sysrq,kdb: Use __handle_sysrq() for kdb's sysrq function
  debug_core,kdb: fix kgdb_connected bit set in the wrong place
  Fix merge regression from external kdb to upstream kdb
  repair gdbstub to match the gdbserial protocol specification
  kdb: break out of kdb_ll() when command is terminated
2010-07-22 11:44:26 -07:00
David Howells 4c0c03ca54 CIFS: Fix a malicious redirect problem in the DNS lookup code
Fix the security problem in the CIFS filesystem DNS lookup code in which a
malicious redirect could be installed by a random user by simply adding a
result record into one of their keyrings with add_key() and then invoking a
CIFS CFS lookup [CVE-2010-2524].

This is done by creating an internal keyring specifically for the caching of
DNS lookups.  To enforce the use of this keyring, the module init routine
creates a set of override credentials with the keyring installed as the thread
keyring and instructs request_key() to only install lookup result keys in that
keyring.

The override is then applied around the call to request_key().

This has some additional benefits when a kernel service uses this module to
request a key:

 (1) The result keys are owned by root, not the user that caused the lookup.

 (2) The result keys don't pop up in the user's keyrings.

 (3) The result keys don't come out of the quota of the user that caused the
     lookup.

The keyring can be viewed as root by doing cat /proc/keys:

2a0ca6c3 I-----     1 perm 1f030000     0     0 keyring   .dns_resolver: 1/4

It can then be listed with 'keyctl list' by root.

	# keyctl list 0x2a0ca6c3
	1 key in keyring:
	726766307: --alswrv     0     0 dns_resolver: foo.bar.com

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-and-Tested-by: Jeff Layton <jlayton@redhat.com>
Acked-by: Steve French <smfrench@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-07-22 09:42:40 -07:00
Alex Deucher 52fa2bbc8e drm/radeon/kms: add quirk to make HP DV5000 laptop resume
Fixes:
https://bugs.freedesktop.org/show_bug.cgi?id=29062

Reported-by:  Andres Cimmarusti <acimmarusti@gmail.com>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-07-22 14:13:52 +10:00
Dmitry Torokhov 3619b8fead Input: synaptics - relax capability ID checks on newer hardware
Older firmwares fixed the middle byte of the Synaptics capabilities
query to 0x47, but starting with firmware 7.5 the middle byte
represents submodel ID, sometimes also called "dash number".

Reported-and-tested-by: Miroslav Šulc <fordfrog@gmail.com>
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-07-21 18:39:03 -07:00
Roland McGrath 0327559151 x86: auditsyscall: fix fastpath return value after reschedule
In the CONFIG_AUDITSYSCALL fast-path for x86 64-bit system calls,
we can pass a bad return value and/or error indication for the
system call to audit_syscall_exit().  This happens when
TIF_NEED_RESCHED was set as the system call returned, so we went
out to schedule() and came back to the exit-audit fast-path.  The
fix is to reload the user return value register from the pt_regs
before using it for audit_syscall_exit().

Both the 32-bit kernel's fast path and the 64-bit kernel's 32-bit
system call fast paths work slightly differently, so that they
always leave the fast path entirely to reschedule and don't return
there, so they don't have the analogous bugs.

Reported-by: Alexander Viro <aviro@redhat.com>
Signed-off-by: Roland McGrath <roland@redhat.com>
2010-07-21 17:44:12 -07:00
Jason Wessel edd63cb6b9 sysrq,kdb: Use __handle_sysrq() for kdb's sysrq function
The kdb code should not toggle the sysrq state in case an end user
wants to try and resume the normal kernel execution.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
2010-07-21 19:27:07 -05:00
Jason Wessel b0679c63db debug_core,kdb: fix kgdb_connected bit set in the wrong place
Immediately following an exit from the kdb shell the kgdb_connected
variable should be set to zero, unless there are breakpoints planted.
If the kgdb_connected variable is not zeroed out with kdb, it is
impossible to turn off kdb.

This patch is merely a work around for now, the real fix will check
for the breakpoints.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2010-07-21 19:27:07 -05:00
Jason Wessel 9e8b624fca Fix merge regression from external kdb to upstream kdb
In the process of merging kdb to the mainline, the kdb lsmod command
stopped printing the base load address of kernel modules.  This is
needed for using kdb in conjunction with external tools such as gdb.

Simply restore the functionality by adding a kdb_printf for the base
load address of the kernel modules.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2010-07-21 19:27:06 -05:00
Jason Wessel fb82c0ff27 repair gdbstub to match the gdbserial protocol specification
The gdbserial protocol handler should return an empty packet instead
of an error string when ever it responds to a command it does not
implement.

The problem cases come from a debugger client sending
qTBuffer, qTStatus, qSearch, qSupported.

The incorrect response from the gdbstub leads the debugger clients to
not function correctly.  Recent versions of gdb will not detach correctly as a result of this behavior.

Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
Signed-off-by: Dongdong Deng <dongdong.deng@windriver.com>
2010-07-21 19:27:05 -05:00
Martin Hicks 1396a21ba0 kdb: break out of kdb_ll() when command is terminated
Without this patch the "ll" linked-list traversal command won't
terminate when you hit q/Q.

Signed-off-by: Martin Hicks <mort@sgi.com>
Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
2010-07-21 19:27:05 -05:00
Alex Deucher 0baf2d8fe4 drm/radeon/kms: fix RADEON_INFO_CRTC_FROM_ID info ioctl
Return the crtc_id, not the counter value.  They are not
necessarily the same.

Cc: Jerome Glisse <glisse@freedesktop.org>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-07-22 10:03:55 +10:00
Luck, Tony d667865114 Fix ttm_page_alloc.c build breakage
The commit 1e8655f873
    drm/ttm: Fix build on architectures without AGP

looks at TTM_HAS_AGP before it has been set in ttm_bo_driver.h

Move the conditional inclusion of <asm/agp.h> *after* we have included
ttm_bo_driver.h

Signed-of-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-07-22 10:02:32 +10:00
Alex Deucher 15cb02c0a0 drm/radeon/kms: fix legacy LVDS dpms sequence
Add delay after turning off the LVDS encoder.

Fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=16389

Tested-by: Jan Kreuzer <kontrollator@gmx.de>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-07-22 10:01:40 +10:00
Dave Airlie 29508eb66b drm/radeon/kms: drop taking lock around crtc lookup.
We only add/remove crtcs at driver load, you cannot remove when
the GPU is running a CS packet since the fd is open, when
GPU hotplugging on radeons actually is needed all this locking
needs a review and I've started re-working kms core locking to deal
with this better. But for now avoid long delays in CS processing when
hotplug detect is happening in a different thread.

this fixes a regression introduced with hotplug detection.

Signed-off-by: Dave Airlie <airlied@redhat.com>
2010-07-22 09:57:13 +10:00
Linus Torvalds cd5b8f8755 Merge branch 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6
* 'urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/brodo/pcmcia-2.6:
  pcmcia: fix 'driver ... did not release config properly' warning
2010-07-21 09:31:15 -07:00
Linus Torvalds 052a1cdbfa Merge branch 'shrinker' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/xfsdev
* 'shrinker' of git://git.kernel.org/pub/scm/linux/kernel/git/dgc/xfsdev:
  mm: add context argument to shrinker callback to remaining shrinkers
2010-07-21 09:30:59 -07:00
Linus Torvalds 84b37df419 Merge branch 'fix/asoc' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6
* 'fix/asoc' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound-2.6:
  ASoC: Select wm_hubs automatically for WM8994
  ASoC: Remove duplicate AUX definition from WM8776
  ASoC:: remove a redundant snd_soc_unregister_codec call in wm8988_register
  ASoC: wm8727: add a missing return in wm8727_platform_probe
  ASoC: fsi: fixup wrong value setting order of TDM
  ASoC: fsi: fixup clock inversion operation
2010-07-21 09:29:39 -07:00
Linus Torvalds 95977d0ef2 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6
* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc-2.6:
  math-emu: correct test for downshifting fraction in _FP_FROM_INT()
  perf: Add DWARF register lookup for sparc
  MAINTAINERS: Add SBUS driver path to sparc entry.
  drivers/sbus: Remove unnecessary casts of private_data
  sparc: remove homegrown L1_CACHE_ALIGN macro
  sparc64: fix the build error due to smp_kgdb_capture_client()
  sparc64: Fix maybe_change_configuration() PCR setting.
  arch/sparc/kernel: Eliminate what looks like a NULL pointer dereference
  sparc64: Update defconfig.
  sunsu: Fix use after free in su_remove().
  sunserial: Don't call add_preferred_console() when console= is specified.
  sparc32: Kill none_mask, it's bogus.
2010-07-21 09:28:50 -07:00
Linus Torvalds a4ce96ac35 Fix up trivial spelling errors ('taht' -> 'that')
Pointed out by Lucas who found the new one in a comment in
setup_percpu.c. And then I fixed the others that I grepped
for.

Reported-by: Lucas <canolucas@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-07-21 09:25:42 -07:00
Patrick McHardy 418c527873 pcmcia: fix 'driver ... did not release config properly' warning
Up to 2.6.34 pcmcia_release_irq() reset p_dev->_irq to 0 after releasing
the irq.  The IRQ is now released in pcmcia_disable_device(), however
p_dev->_irq is not reset, triggering a warning in pcmcia_device_remove().

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
2010-07-21 13:52:36 +02:00
Dave Chinner 567c7b0ede mm: add context argument to shrinker callback to remaining shrinkers
Add the shrinkers missed in the first conversion of the API in
commit 7f8275d0d6 ("mm: add context argument to
shrinker callback").

Signed-off-by: Dave Chinner <dchinner@redhat.com>
2010-07-21 15:33:01 +10:00
Dmitry Torokhov 3fea60261e Input: twl40300-keypad - fix handling of "all ground" rows
The Nokia RX51 board code (arch/arm/mach-omap2/board-rx51-peripherals.c)
defines a key map for the matrix keypad keyboard. The hardware seems to
use all of the 8 rows and 8 columns of the keypad, although not all
possible locations are used.

The TWL4030 supports keypads with at most 8 rows and 8 columns. Most keys
are defined with a row and column number between 0 and 7, except

        KEY(0xff, 2, KEY_F9),
        KEY(0xff, 4, KEY_F10),
        KEY(0xff, 5, KEY_F11),

which represent keycodes that should be emitted when entire row is
connected to the ground.  since the driver handles this case as if we
had an extra column in the key matrix. Unfortunately we do not allocate
enough space and end up owerwriting some random memory.

Reported-and-tested-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-07-20 20:29:48 -07:00
Dmitry Torokhov c25f7b763c Input: gamecon - reference correct pad in gc_psx_command()
Otherwise we won't see any events from the gamepad.
Addresses https://bugzilla.kernel.org/show_bug.cgi?id=16408

Reported-and-tested-by: Eugene Yudin <eugene.yudin@gmail.com>
Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-07-20 20:29:32 -07:00
Dmitry Torokhov 7b5d3312fb Input: gamecon - reference correct input device in NES mode
We moved input devices from 'struct gc' to individial pads (struct
gc-pad), but gc_nes_process_packet() was still trying to use old
ones and crashing.

Cc: stable@kernel.org
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
2010-07-20 20:29:11 -07:00
Mikael Pettersson f8324e20f8 math-emu: correct test for downshifting fraction in _FP_FROM_INT()
The kernel's math-emu code contains a macro _FP_FROM_INT() which is
used to convert an integer to a raw normalized floating-point value.
It does this basically in three steps:

1. Compute the exponent from the number of leading zero bits.
2. Downshift large fractions to put the MSB in the right position
   for normalized fractions.
3. Upshift small fractions to put the MSB in the right position.

There is an boundary error in step 2, causing a fraction with its
MSB exactly one bit above the normalized MSB position to not be
downshifted.  This results in a non-normalized raw float, which when
packed becomes a massively inaccurate representation for that input.

The impact of this depends on a number of arch-specific factors,
but it is known to have broken emulation of FXTOD instructions
on UltraSPARC III, which was originally reported as GCC bug 44631
<http://gcc.gnu.org/bugzilla/show_bug.cgi?id=44631>.

Any arch which uses math-emu to emulate conversions from integers to
same-size floats may be affected.

The fix is simple: the exponent comparison used to determine if the
fraction should be downshifted must be "<=" not "<".

I'm sending a kernel module to test this as a reply to this message.
There are also SPARC user-space test cases in the GCC bug entry.

Signed-off-by: Mikael Pettersson <mikpe@it.uu.se>
Signed-off-by: David S. Miller <davem@davemloft.net>
2010-07-20 18:45:14 -07:00
Linus Torvalds f4b23cc2d5 Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
* 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6:
  drm/r600: fix possible NULL pointer derefernce
  drm/radeon/kms: add quirk for ASUS HD 3600 board
  include/linux/vgaarb.h: add missing part of include guard
  drm/nouveau: Fix crashes during fbcon init on single head cards.
  drm/nouveau: fix pcirom vbios shadow breakage from acpi rom patch
  drm/radeon/kms: fix shared ddc harder
  drm/i915: enable low power render writes on GEN3 hardware.
  drm/i915: Define MI_ARB_STATE bits
  vmwgfx: return -EFAULT if copy_to_user fails
  fb: handle allocation failure in alloc_apertures()
  drm: radeon: check kzalloc() result
  drm/ttm: Fix build on architectures without AGP
  drm/radeon/kms: fix gtt MC base alignment on rs4xx/rs690/rs740 asics
  drm/radeon/kms: fix possible mis-detection of sideport on rs690/rs740
  drm/radeon/kms: fix legacy tv-out pal mode
2010-07-20 18:29:25 -07:00