The 'debug_data' variable gets printed in debug statements without a prior initialization in the function hubbub1_verify_allow_pstate_change_high, as reported when building with gcc 9.1.0:
warning: ‘debug_data’ may be used uninitialized in this function [-Wmaybe-uninitialized] 290 | printk##once(KERN_##level "[" DRM_NAME "] " fmt, ##__VA_ARGS__) | ^~~~~~ dc/dcn10/dcn10_hubbub.c:134:15: note: ‘debug_data’ was declared here 134 | unsigned int debug_data;
Note that initialize debug_data with 0, in this case, is safe because we have a loop in a few lines below that will initialize this variable with the proper value.
Signed-off-by: Rodrigo Siqueira Rodrigo.Siqueira@amd.com --- drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c index a780057e2dbc..b6967a7e6c7b 100644 --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hubbub.c @@ -133,7 +133,7 @@ bool hubbub1_verify_allow_pstate_change_high( static unsigned int max_sampled_pstate_wait_us; /* data collection */ static bool forced_pstate_allow; /* help with revert wa */
- unsigned int debug_data; + unsigned int debug_data = 0; unsigned int i;
if (forced_pstate_allow) {