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David Woodhouse 5854d9c8d1 Fix handling of the HP/Acer 'DMAR at zero' BIOS error for machines with <4GiB RAM. 
Commit 86cf898e1d ("intel-iommu: Check for
'DMAR at zero' BIOS error earlier.") was supposed to work by pretending
not to detect an IOMMU if it was actually being reported by the BIOS at
physical address zero.

However, the intel_iommu_init() function is called unconditionally, as
are the corresponding functions for other IOMMU hardware.

So the patch only worked if you have RAM above the 4GiB boundary. It
caused swiotlb to be initialised when no IOMMU was detected during early
boot, and thus the later IOMMU init would refuse to run.

But if you have less RAM than that, swiotlb wouldn't get set up and the
IOMMU _would_ still end up being initialised, even though we never
claimed to detect it.

This patch also sets the dmar_disabled flag when the error is detected
during the initial detection phase -- so that the later call to
intel_iommu_init() will return without doing anything, regardless of
whether swiotlb is used or not.

Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
 		2009-11-19 13:42:02 -08:00
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accessibility
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acpi Merge branch 'bugzilla-13449' into release 2009-11-06 01:45:11 -05:00
amba
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ata sata_via: Remove redundant device ID for VIA VT8261 2009-11-03 14:27:06 -05:00
atm
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auxdisplay
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base PM: Remove some debug messages producing too much noise 2009-11-03 11:18:18 +01:00
block loop: fix NULL dereference if mount fails 2009-10-29 07:39:27 -07:00
bluetooth fix memory leak in fixed btusb_close 2009-11-14 12:57:08 -08:00
cdrom
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char Merge branch 'agp-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/agp-2.6 2009-11-18 17:08:16 -08:00
clocksource
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connector
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cpufreq [CPUFREQ] Fix stale cpufreq_cpu_governor pointer 2009-11-17 23:15:04 -05:00
cpuidle cpuidle: always return with interrupts enabled 2009-10-29 07:39:31 -07:00
crypto
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dca
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dio
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dma
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edac amd64_edac: fix CECCs reporting 2009-11-04 14:04:06 +01:00
eisa
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firewire Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee1394/linux1394-2.6 2009-10-14 15:36:19 -07:00
firmware
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gpio gpiolib: fix device_create() result check 2009-11-12 07:26:00 -08:00
gpu Merge branch 'hostprogs-wmissing-prototypes' of git://git.kernel.org/pub/scm/linux/kernel/git/josh/linux-misc 2009-11-17 09:14:49 -08:00
hid Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid 2009-10-13 10:10:33 -07:00
hwmon hwmon: (adt7475) Fix sysfs file names 2009-11-16 12:45:40 +01:00
i2c i2c-piix4: Modify code name SB900 to Hudson-2 2009-11-07 13:10:46 +01:00
ide Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide-2.6 2009-11-09 09:50:55 -08:00
idle
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ieee1394
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ieee802154
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infiniband
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input Input: lifebook - fix settings for CF-72 2009-11-16 22:27:12 -08:00
isdn Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-11-18 14:54:45 -08:00
leds leds-gpio: fix possible crash on OF device unbinding 2009-11-16 11:50:42 +00:00
lguest
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macintosh powerpc/pmac: Fix issues with sleep on some powerbooks 2009-10-14 16:58:35 +11:00
mca
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md md/raid5: Allow dirty-degraded arrays to be assembled when only party is degraded. 2009-11-13 17:47:00 +11:00
media V4L/DVB (13314): saa7134: set ts_force_val for the Hauppauge WinTV HVR-1150 2009-11-07 12:55:15 -02:00
memstick
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message
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mfd mfd: Do not dereference null pointer in twl4030 error path 2009-10-27 00:20:33 +01:00
misc sgi-gru: decrapfiy options_write() function 2009-11-05 10:48:30 -08:00
mmc mmci-omap: free irq resource 2009-11-12 07:25:57 -08:00
mtd ARM: Fix warning in sa1100-flash.c 2009-11-16 16:13:35 +00:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 2009-11-18 14:54:45 -08:00
nubus
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of of: Remove nested function 2009-10-15 09:58:27 -06:00
oprofile
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parisc
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parport
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pci Fix handling of the HP/Acer 'DMAR at zero' BIOS error for machines with <4GiB RAM. 2009-11-19 13:42:02 -08:00
pcmcia PM / yenta: Split resume into early and late parts (rev. 4) 2009-11-03 10:54:58 +01:00
platform eeepc-laptop: don't enable camera at startup if it's already on. 2009-11-03 10:24:19 -05:00
pnp
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power
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pps pps: events reporting fix up 2009-11-12 07:26:01 -08:00
ps3
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rapidio
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regulator dereferencing freed memory regulator_fixed_voltage_remove() 2009-11-16 12:40:25 +00:00
rtc ARM: 5787/1: U300 COH 901 331 fixes 2009-11-16 16:15:49 +00:00
s390 [S390] sclp: undo quiesce handler override on resume 2009-11-13 15:45:03 +01:00
sbus
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scsi [SCSI] bfa: declare MODULE_FIRMWARE 2009-11-11 12:21:06 -05:00
serial serial: add support for the Lava Quattro PCI quad-port 16550A card 2009-11-12 07:25:57 -08:00
sfi
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sh
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sn
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spi spi: error status should be negative 2009-11-17 17:40:32 -08:00
ssb ssb-pcmcia: Fix 32bit register access in early bus scanning 2009-11-10 16:21:12 -05:00
staging Staging: fix wireless drivers depends 2009-10-30 14:47:44 -07:00
tc
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telephony
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thermal acpi: thermal: Add EOL to the trip_point_N_type strings 2009-11-05 17:33:24 -05:00
uio uio: pm_runtime_disable is needed if failed 2009-11-13 11:36:00 +09:00
usb Merge git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb-2.6 2009-11-18 07:37:51 -08:00
uwb
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video drivers/video/da8xx-fb.c: fix error return 2009-11-17 17:40:33 -08:00
virtio virtio: order used ring after used index read 2009-10-29 08:50:37 +10:30
vlynq
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w1
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watchdog [WATCHDOG] SBC-FITPC2 watchdog driver registration fix 2009-11-10 15:06:52 +00:00
xen
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zorro
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Kconfig
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Makefile
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