4.4-stable review patch. If anyone has any objections, please let me know.
------------------
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);
--
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