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vgaarb: fix signal handling in vga_get()

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commit 9f5bd30818c42c6c36a51f93b4df75a2ea2bd85e upstream.

There are few defects in vga_get() related to signal hadning:

  - we shouldn't check for pending signals for TASK_UNINTERRUPTIBLE
    case;

  - if we found pending signal we must remove ourself from wait queue
    and change task state back to running;

  - -ERESTARTSYS is more appropriate, I guess.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Reviewed-by: David Herrmann <dh.herrmann@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Zefan Li <lizefan@huawei.com>
This commit is contained in:
Kirill A. Shutemov 2015-11-30 04:17:31 +02:00 committed by Zefan Li
parent 10c6ff6e59
commit 1405c2b764
1 changed files with 4 additions and 2 deletions
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6
drivers/gpu/vga/vgaarb.c
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@ -381,8 +381,10 @@ int vga_get(struct pci_dev *pdev, unsigned int rsrc, int interruptible)
set_current_state(interruptible ?
TASK_INTERRUPTIBLE :
TASK_UNINTERRUPTIBLE);
if (signal_pending(current)) {
rc = -EINTR;
if (interruptible && signal_pending(current)) {
__set_current_state(TASK_RUNNING);
remove_wait_queue(&vga_wait_queue, &wait);
rc = -ERESTARTSYS;
break;
}
schedule();