This is a note to let you know that I've just added the patch titled
drm/vmwgfx: Fix an incorrect lock check
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
drm-vmwgfx-fix-an-incorrect-lock-check.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fb89ac5102ae2875d685c847e6b5dbc141622d43 Mon Sep 17 00:00:00 2001
From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Date: Fri, 8 Jan 2016 20:29:39 +0100
Subject: drm/vmwgfx: Fix an incorrect lock check
From: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
commit fb89ac5102ae2875d685c847e6b5dbc141622d43 upstream.
With CONFIG_SMP=n and CONFIG_DEBUG_SPINLOCK=y the vmwgfx kernel module
would unconditionally throw a bug when checking for a held spinlock
in the command buffer code. Fix this by using a lockdep check.
Reported-and-tested-by: Tetsuo Handa <penguin-kernel@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Thomas Hellstrom <thellstrom@xxxxxxxxxx>
Reviewed-by: Sinclair Yeh <syeh@xxxxxxxxxx>
Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_cmdbuf.c
@@ -247,7 +247,7 @@ static void __vmw_cmdbuf_header_free(str
{
struct vmw_cmdbuf_man *man = header->man;
- BUG_ON(!spin_is_locked(&man->lock));
+ lockdep_assert_held_once(&man->lock);
if (header->inline_space) {
vmw_cmdbuf_header_inline_free(header);
Patches currently in stable-queue which might be from thellstrom@xxxxxxxxxx are
queue-4.4/drm-vmwgfx-respect-nomodeset.patch
queue-4.4/drm-vmwgfx-fix-an-incorrect-lock-check.patch
queue-4.4/drm-vmwgfx-fix-a-width-pitch-mismatch-on-framebuffer-updates.patch
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