[Intel-gfx] [PATCH] i915/perf: Fix NULL deref bugs with drm_dbg() calls

[Harshit Mogalapalli]

When i915 perf interface is not available dereferencing it will lead to
NULL dereferences.

Fix this by using DRM_DEBUG() which the scenario before the commit in
the Fixes tag.

Fixes: 2fec539112e8 ("i915/perf: Replace DRM_DEBUG with driver specific drm_dbg 
call")
Signed-off-by: Harshit Mogalapalli <harshit.m.mogalapa...@oracle.com>
---
This is found using smatch(static analysis tool), only compile tested.
---
 drivers/gpu/drm/i915/i915_perf.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 2f3ecd7d4804..bb48c96b7950 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -4228,8 +4228,7 @@ int i915_perf_open_ioctl(struct drm_device *dev, void 
*data,
        int ret;
 
        if (!perf->i915) {
-               drm_dbg(&perf->i915->drm,
-                       "i915 perf interface not available for this system\n");
+               DRM_DEBUG("i915 perf interface not available for this 
system\n");
                return -ENOTSUPP;
        }
 
@@ -4608,8 +4607,7 @@ int i915_perf_add_config_ioctl(struct drm_device *dev, 
void *data,
        int err, id;
 
        if (!perf->i915) {
-               drm_dbg(&perf->i915->drm,
-                       "i915 perf interface not available for this system\n");
+               DRM_DEBUG("i915 perf interface not available for this 
system\n");
                return -ENOTSUPP;
        }
 
@@ -4774,8 +4772,7 @@ int i915_perf_remove_config_ioctl(struct drm_device *dev, 
void *data,
        int ret;
 
        if (!perf->i915) {
-               drm_dbg(&perf->i915->drm,
-                       "i915 perf interface not available for this system\n");
+               DRM_DEBUG("i915 perf interface not available for this 
system\n");
                return -ENOTSUPP;
        }
 
-- 
2.39.3