Commit Graph

19 Commits

Author SHA1 Message Date
Al Viro 2843114699 [PATCH] misc arm pt_regs fixes
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-10-08 12:32:36 -07:00
David Howells 7d12e780e0 IRQ: Maintain regs pointer globally rather than passing to IRQ handlers
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells <dhowells@redhat.com>
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
2006-10-05 15:10:12 +01:00
Dirk Opfer 519854876c [PATCH] Fix dm9000 release_resource
dm9000_release_board calls release_resource with the platform resource
instead of the requested resource:

db->addr_res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
db->addr_req = request_mem_region(db->addr_res->start, i, pdev->name);

dm9000_release_board:

if (db->addr_res != NULL) {
release_resource(db->addr_res);
kfree(db->addr_req);

With this behavior the kernel will crash on the second removal. The
attached patch fix this problem.

Signed-off-by: Dirk Opfer <Dirk@Opfer-Online.de>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-09-11 09:08:38 -04:00
Kevin Hao 2fd0e33f4f [PATCH] net: Add netconsole support to dm9000 driver
Add netconsole support to dm9000 driver.

Cc: Jeff Garzik <jeff@garzik.org>
Cc: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-08-19 17:44:29 -04:00
Thomas Gleixner 1fb9df5d30 [PATCH] irq-flags: drivers/net: Use the new IRQF_ constants
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Jeff Garzik <jeff@garzik.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2006-07-02 13:58:51 -07:00
Ben Dooks 5d22a312b7 [PATCH] DM9000 - minor code cleanups
Ensure the driver's module owner field is
initialised for when this is being built and
loaded as a module.

Also change make the dm9000_tx_done function
static, as it is not exported elsewhere.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-06-26 22:01:53 -04:00
Ben Dooks 19af5a8b2b [PATCH] DM9000 - do no re-init spin lock
The DM9000 initialisation sequence for the
hardware re-initialise the board spin-lock,
which is in my view wrong.

This patch removes the extra spin lock
initialisation

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-06-26 22:01:53 -04:00
Ben Dooks 5b55dda6f4 [PATCH] DM9000 - check for MAC left in by bootloader
The DM9000 driver does not deal with the case
where there is no serial EEPROM to store the
configuration, and the bootloader has placed
an MAC address into the device already.

If there is no valid MAC in the EEPROM, read
the one already in the chip and check to see
if that one is valid.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-06-26 22:01:53 -04:00
Ben Dooks b4ed03ff12 [PATCH] DM9000 - better checks for platform resources
The current DM9000 driver cannot cope if it
is given more than 3 resources (for example, if
it is being passed an wake-up irq that it is
not using yet).

Check that we have been given at-least one IRQ
resource.

Also fix the minor type-casting for the case
of 2 resources.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
2006-06-26 22:01:53 -04:00
Linus Torvalds 5643f000c1 Merge master.kernel.org:/home/rmk/linux-2.6-drvmodel 2005-11-11 09:24:26 -08:00
Russell King 3ae5eaec1d [DRIVER MODEL] Convert platform drivers to use struct platform_driver
This allows us to eliminate the casts in the drivers, and eventually
remove the use of the device_driver function pointer methods for
platform device drivers.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-11-09 22:32:44 +00:00
Olaf Hering 733482e445 [PATCH] changing CONFIG_LOCALVERSION rebuilds too much, for no good reason
This patch removes almost all inclusions of linux/version.h.  The 3
#defines are unused in most of the touched files.

A few drivers use the simple KERNEL_VERSION(a,b,c) macro, which is
unfortunatly in linux/version.h.

There are also lots of #ifdef for long obsolete kernels, this was not
touched.  In a few places, the linux/version.h include was move to where
the LINUX_VERSION_CODE was used.

quilt vi `find * -type f -name "*.[ch]"|xargs grep -El '(UTS_RELEASE|LINUX_VERSION_CODE|KERNEL_VERSION|linux/version.h)'|grep -Ev '(/(boot|coda|drm)/|~$)'`

search pattern:
/UTS_RELEASE\|LINUX_VERSION_CODE\|KERNEL_VERSION\|linux\/\(utsname\|version\).h

Signed-off-by: Olaf Hering <olh@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-11-09 07:55:57 -08:00
Russell King d052d1beff Create platform_device.h to contain all the platform device details.
Convert everyone who uses platform_bus_type to include
linux/platform_device.h.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-29 19:07:23 +01:00
Russell King 9480e307cd [PATCH] DRIVER MODEL: Get rid of the obsolete tri-level suspend/resume callbacks
In PM v1, all devices were called at SUSPEND_DISABLE level.  Then
all devices were called at SUSPEND_SAVE_STATE level, and finally
SUSPEND_POWER_DOWN level.  However, with PM v2, to maintain
compatibility for platform devices, I arranged for the PM v2
suspend/resume callbacks to call the old PM v1 suspend/resume
callbacks three times with each level in order so that existing
drivers continued to work.

Since this is obsolete infrastructure which is no longer necessary,
we can remove it.  Here's an (untested) patch to do exactly that.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
2005-10-28 09:52:56 -07:00
viro@ftp.linux.org.uk 43fece7b8b [PATCH] missed s/u32/pm_message_t/ (dm9000)
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-09-06 22:17:12 -04:00
Ben Dooks 2ae2d77cfa [PATCH] DM9000 - incorrect ioctl() handling
The DM9000 driver is responding to ioctl() calls it should not be. This
can cause problems with the wireless tools incorrectly indentifying the
device as wireless capable, and crashing under certain operations.

This patch also moves the version printk() to the init call, so that
you only get it once for multiple devices, and to show it is loaded
if there are no defined dm9000s

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-08-18 16:59:14 -04:00
Ben Dooks 9ef9ac51cc [PATCH] DM9000 - spinlock fixes
Fix DM9000 driver usage of spinlocks, which mainly came to light
when running a kernel with spinlock debugging. These come down to:

1) Un-initialised spin lock

2) Several cases of using  spin_xxx(lock) and not spin_xxx(&lock)

3) move the locking around the phy reg for read/write to only
   keep the lock when actually reading or writing to the phy.

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
2005-08-18 16:59:14 -04:00
Sascha Hauer 5f6b5517bf [PATCH] DM9000 network driver bugfix
This patch fixes two bugs in the dm9000 network driver:

- Don't read one byte too much in 8bit mode.
- release correct resource

Signed-off-by: Jochen Karrer <j.karrer@lightmaze.com>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Cc: Jeff Garzik <jgarzik@pobox.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
2005-06-26 18:37:26 -04:00
Sascha Hauer a1365275e7 [PATCH] DM9000 network driver
This patch adds support for the davicom dm9000 network driver.  The dm9000
is found on some embedded arm boards such as the pimx1 or the scb9328.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Andrew Morton <akpm@osdl.org>

diff -puN /dev/null drivers/net/dm9000.c
2005-05-15 18:31:07 -04:00