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drm/stm: ltdc: fix late dereference check 

In ltdc_crtc_set_crc_source(), struct drm_crtc was dereferenced in a
container_of() before the pointer check. This could cause a kernel panic.

Fix this smatch warning:
drivers/gpu/drm/stm/ltdc.c:1124 ltdc_crtc_set_crc_source() warn: variable dereferenced before check 'crtc' (see line 1119)

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/lkml/202212241802.zeLFZCXB-lkp@intel.com/
Reported-by: Dan Carpenter <error27@gmail.com>
Closes: https://lore.kernel.org/lkml/202212241802.zeLFZCXB-lkp@intel.com/
Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Acked-by: Philippe Cornu <philippe.cornu@foss.st.com>
Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230515123818.93971-1-raphael.gallais-pou@foss.st.com
This commit is contained in:
Raphael Gallais-Pou 2023-05-15 14:38:18 +02:00 committed by Philippe Cornu
parent 34235f54b0
commit 898a9e3f56
1 changed files with 3 additions and 1 deletions
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4
drivers/gpu/drm/stm/ltdc.c
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@ -1145,7 +1145,7 @@ static void ltdc_crtc_disable_vblank(struct drm_crtc *crtc)
static int ltdc_crtc_set_crc_source(struct drm_crtc *crtc, const char *source)
{
struct ltdc_device *ldev = crtc_to_ltdc(crtc);
struct ltdc_device *ldev;
int ret;
DRM_DEBUG_DRIVER("\n");
@ -1153,6 +1153,8 @@ static int ltdc_crtc_set_crc_source(struct drm_crtc *crtc, const char *source)
if (!crtc)
return -ENODEV;
ldev = crtc_to_ltdc(crtc);
if (source && strcmp(source, "auto") == 0) {
ldev->crc_active = true;
ret = regmap_set_bits(ldev->regmap, LTDC_GCR, GCR_CRCEN);