[PATCH 3.4 078/125] vgaarb: fix signal handling in vga_get()

From	lizf@kernel.org
Newsgroups	linux.kernel
Subject	[PATCH 3.4 078/125] vgaarb: fix signal handling in vga_get()
Date	2016-10-12 15:10 +0200
Message-ID	<srrse-4OM-55@gated-at.bofh.it> (permalink)
References	<srqZb-4nM-3@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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From: "Kirill A. Shutemov" <kirill@shutemov.name>

3.4.113-rc1 review patch.  If anyone has any objections, please let me know.

------------------


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>
---
 drivers/gpu/vga/vgaarb.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 111d956..6a46d6e 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -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();
-- 
1.9.1

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[PATCH 3.4 078/125] vgaarb: fix signal handling in vga_get() lizf@kernel.org - 2016-10-12 15:10 +0200

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