[PATCH] drm: Fix a possible sleep-in-atomic bug in show_leaks

[Jia-Ju Bai]

The driver may sleep under a spinlock.
The function call path is:
drm_vma_offset_manager_destroy (acquire the spinlock)
  drm_mm_takedown
    show_leaks
      kmalloc(GFP_KERNEL) --> may sleep

To fix it, GFP_KERNEL is replaced with GFP_ATOMIC.

This bug is found by my static analysis tool(DSAC) and checked by my code review.

Signed-off-by: Jia-Ju Bai <baijiaju1990 at gmail.com>
---
 drivers/gpu/drm/drm_mm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_mm.c b/drivers/gpu/drm/drm_mm.c
index 61a1c8e..5b9965d 100644
--- a/drivers/gpu/drm/drm_mm.c
+++ b/drivers/gpu/drm/drm_mm.c
@@ -127,7 +127,7 @@ static void show_leaks(struct drm_mm *mm)
 	unsigned long entries[STACKDEPTH];
 	char *buf;
 
-	buf = kmalloc(BUFSZ, GFP_KERNEL);
+	buf = kmalloc(BUFSZ, GFP_ATOMIC);
 	if (!buf)
 		return;
 
-- 
1.7.9.5