Youquan,Song 46256f83d0 PCI: AER: fix aer inject result in kernel oops ... If the BIOS does not export _OSC to allow OS take over the PCIe AER, the pcie aer driver will not initialize the aer service. However, the aer_inject driver does not check this scenario, which results in a kernel oops when injecting an aer error into OS. For example: BUG: unable to handle kernel NULL pointer dereference at 0000000000000350 IP: [<ffffffff812e08f7>] _spin_lock_irqsave+0xc/0x23 PGD 155c41067 PUD 157fe0067 PMD 0 Oops: 0002 [#1] SMP Pid: 5119, comm: aer-inject Not tainted 2.6.32-rc8-mce #2 RIP: 0010:[<ffffffff812e08f7>] [<ffffffff812e08f7>] _spin_lock_irqsave+0xc/0x23 RSP: 0018:ffff880157f81e28 EFLAGS: 00010096 RAX: 0000000000000296 RBX: 0000000000000000 RCX: 0000000000000100 RDX: 0000000000010000 RSI: 0000000000000246 RDI: 0000000000000350 RBP: ffff880157f81e28 R08: 0000000000000004 R09: ffff880157f81dac R10: ffff88015a666f60 R11: ffff88015a666f40 R12: ffff88015758cc00 R13: 0000000000000350 R14: 0000000000000000 R15: 0000000000000100 FS: 00007f4d4a66e6f0(0000) GS:ffff8800282e0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 0000000000000350 CR3: 000000015661a000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process aer-inject (pid: 5119, threadinfo ffff880157f80000, task ffff8801585f4340) Stack: ffff880157f81e78 ffffffff811b1615 ffff880157f81e78 ffffffff81222823 Call Trace: [<ffffffff811b1615>] aer_irq+0x38/0x117 [<ffffffff81222823>] ? device_for_each_child+0x5f/0x6f [<ffffffffa00967bf>] aer_inject_write+0x409/0x45e [aer_inject] [<ffffffff810eb80e>] vfs_write+0xae/0x16a [<ffffffff810eb98e>] sys_write+0x47/0x6e [<ffffffff8100ba2b>] system_call_fastpath+0x16/0x1b RIP [<ffffffff812e08f7>] _spin_lock_irqsave+0xc/0x23 RSP <ffff880157f81e28> CR2: 0000000000000350 So check the _OSC before assuming that AER is available to the OS. Signed-off-by: Youquan, Song <youquan.song@intel.com> Acked-by: Ying, Huang <ying.huang@intel.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>		2010-01-04 08:31:46 -08:00
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aer_inject.c	PCI: AER: fix aer inject result in kernel oops	2010-01-04 08:31:46 -08:00
aerdrv_acpi.c	PCI: change PCI nomenclature in drivers/pci/ (comment changes)	2009-12-16 13:37:53 -08:00
aerdrv_core.c	PCI: change PCI nomenclature in drivers/pci/ (comment changes)	2009-12-16 13:37:53 -08:00
aerdrv_errprint.c	PCI: change PCI nomenclature in drivers/pci/ (non-comment changes)	2009-12-16 13:37:54 -08:00
aerdrv.c	PCI: change PCI nomenclature in drivers/pci/ (comment changes)	2009-12-16 13:37:53 -08:00
aerdrv.h	PCI: pcie, aer: report all error before recovery	2009-09-09 13:50:13 -07:00
ecrc.c	PCIe AER: use pci_is_pcie()	2009-11-24 15:25:17 -08:00
Kconfig	PCI AER: software error injection	2009-06-16 14:30:14 -07:00
Kconfig.debug	PCI: change PCI nomenclature in drivers/pci/ (non-comment changes)	2009-12-16 13:37:54 -08:00
Makefile	PCI AER: software error injection	2009-06-16 14:30:14 -07:00