From: John Harrison John.C.Harrison@Intel.com
If the GuC has failed to load for any reason and then the user pokes the debugfs GuC log interface, a BUG and/or null pointer deref can occur. Don't let that happen.
Signed-off-by: John Harrison John.C.Harrison@Intel.com Reviewed-by: Lucas De Marchi lucas.demarchi@intel.com --- drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c index 46026c2c1722..8fd068049376 100644 --- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c +++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log_debugfs.c @@ -31,7 +31,7 @@ static int guc_log_level_get(void *data, u64 *val) { struct intel_guc_log *log = data;
- if (!intel_guc_is_used(log_to_guc(log))) + if (!log->vma) return -ENODEV;
*val = intel_guc_log_get_level(log); @@ -43,7 +43,7 @@ static int guc_log_level_set(void *data, u64 val) { struct intel_guc_log *log = data;
- if (!intel_guc_is_used(log_to_guc(log))) + if (!log->vma) return -ENODEV;
return intel_guc_log_set_level(log, val);