linux-kernel - [PATCH 3.4 078/125] vgaarb: fix signal handling in vga

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Message-Id: <1476275641-4697-78-git-send-email-lizf@kernel.org>
Date:   Wed, 12 Oct 2016 20:33:14 +0800
From:   lizf@...nel.org
To:     stable@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org,
        "Kirill A. Shutemov" <kirill@...temov.name>,
        Dave Airlie <airlied@...hat.com>, Zefan Li <lizefan@...wei.com>
Subject: [PATCH 3.4 078/125] vgaarb: fix signal handling in vga_get()

From: "Kirill A. Shutemov" <kirill@...temov.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@...temov.name>
Reviewed-by: David Herrmann <dh.herrmann@...il.com>
Signed-off-by: Dave Airlie <airlied@...hat.com>
Signed-off-by: Zefan Li <lizefan@...wei.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