From 46256f83d0d066f99ffde547f27473dfd2a78009 Mon Sep 17 00:00:00 2001 From: "Youquan,Song" Date: Fri, 11 Dec 2009 18:42:35 -0500 Subject: [PATCH] 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: [] _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:[] [] _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: [] aer_irq+0x38/0x117 [] ? device_for_each_child+0x5f/0x6f [] aer_inject_write+0x409/0x45e [aer_inject] [] vfs_write+0xae/0x16a [] sys_write+0x47/0x6e [] system_call_fastpath+0x16/0x1b RIP [] _spin_lock_irqsave+0xc/0x23 RSP CR2: 0000000000000350 So check the _OSC before assuming that AER is available to the OS. Signed-off-by: Youquan, Song Acked-by: Ying, Huang Signed-off-by: Jesse Barnes --- drivers/pci/pcie/aer/aer_inject.c | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff --git a/drivers/pci/pcie/aer/aer_inject.c b/drivers/pci/pcie/aer/aer_inject.c index 797d47809f7a..dd7155a037e7 100644 --- a/drivers/pci/pcie/aer/aer_inject.c +++ b/drivers/pci/pcie/aer/aer_inject.c @@ -413,8 +413,14 @@ static int aer_inject(struct aer_error_inj *einj) if (ret) goto out_put; - if (find_aer_device(rpdev, &edev)) + if (find_aer_device(rpdev, &edev)) { + if (!get_service_data(edev)) { + printk(KERN_WARNING "AER service is not initialized\n"); + ret = -EINVAL; + goto out_put; + } aer_irq(-1, edev); + } else ret = -EINVAL; out_put: -- 2.20.1