[PATCH] drm/tegra: hdmi: sor: Fix error: variable ‘j’ set but not used

[PATCH] drm/tegra: hdmi: sor: Fix error: variable ‘j’ set but not used

[Brahmajit Das]

The variable j is set, however never used in or outside the loop, thus
resulting in dead code.
Building with GCC 16 results in a build error due to
-Werror=unused-but-set-variable= enabled by default.
This patch clean up the dead code and fixes the build error.

Example build log:
drivers/gpu/drm/tegra/sor.c:1867:19: error: variable ‘j’ set but not used [-Werror=unused-but-set-variable=]
 1867 |         size_t i, j;
      |                   ^

Signed-off-by: Brahmajit Das <listout@listout.xyz>
---
 drivers/gpu/drm/tegra/hdmi.c | 4 ++--
 drivers/gpu/drm/tegra/sor.c  | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
index 8cd2969e7d4b..c4820f5e7658 100644
--- a/drivers/gpu/drm/tegra/hdmi.c
+++ b/drivers/gpu/drm/tegra/hdmi.c
@@ -658,7 +658,7 @@ static void tegra_hdmi_write_infopack(struct tegra_hdmi *hdmi, const void *data,
 {
 	const u8 *ptr = data;
 	unsigned long offset;
-	size_t i, j;
+	size_t i;
 	u32 value;
 
 	switch (ptr[0]) {
@@ -691,7 +691,7 @@ static void tegra_hdmi_write_infopack(struct tegra_hdmi *hdmi, const void *data,
 	 * - subpack_low: bytes 0 - 3
 	 * - subpack_high: bytes 4 - 6 (with byte 7 padded to 0x00)
 	 */
-	for (i = 3, j = 0; i < size; i += 7, j += 8) {
+	for (i = 3; i < size; i += 7) {
 		size_t rem = size - i, num = min_t(size_t, rem, 4);
 
 		value = tegra_hdmi_subpack(&ptr[i], num);
diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
index 21f3dfdcc5c9..bc7dd562cf6b 100644
--- a/drivers/gpu/drm/tegra/sor.c
+++ b/drivers/gpu/drm/tegra/sor.c
@@ -1864,7 +1864,7 @@ static void tegra_sor_hdmi_write_infopack(struct tegra_sor *sor,
 {
 	const u8 *ptr = data;
 	unsigned long offset;
-	size_t i, j;
+	size_t i;
 	u32 value;
 
 	switch (ptr[0]) {
@@ -1897,7 +1897,7 @@ static void tegra_sor_hdmi_write_infopack(struct tegra_sor *sor,
 	 * - subpack_low: bytes 0 - 3
 	 * - subpack_high: bytes 4 - 6 (with byte 7 padded to 0x00)
 	 */
-	for (i = 3, j = 0; i < size; i += 7, j += 8) {
+	for (i = 3; i < size; i += 7) {
 		size_t rem = size - i, num = min_t(size_t, rem, 4);
 
 		value = tegra_sor_hdmi_subpack(&ptr[i], num);
-- 
2.51.0

Re: [PATCH] drm/tegra: hdmi: sor: Fix error: variable ‘j’ set but not used

[Mikko Perttunen]

On Tuesday, September 2, 2025 6:20 AM Brahmajit Das wrote:
> The variable j is set, however never used in or outside the loop, thus
> resulting in dead code.
> Building with GCC 16 results in a build error due to
> -Werror=unused-but-set-variable= enabled by default.
> This patch clean up the dead code and fixes the build error.
> 
> Example build log:
> drivers/gpu/drm/tegra/sor.c:1867:19: error: variable ‘j’ set but not used [-Werror=unused-but-set-variable=]
>  1867 |         size_t i, j;
>       |                   ^
> 
> Signed-off-by: Brahmajit Das <listout@listout.xyz>
> ---
>  drivers/gpu/drm/tegra/hdmi.c | 4 ++--
>  drivers/gpu/drm/tegra/sor.c  | 4 ++--
>  2 files changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/tegra/hdmi.c b/drivers/gpu/drm/tegra/hdmi.c
> index 8cd2969e7d4b..c4820f5e7658 100644
> --- a/drivers/gpu/drm/tegra/hdmi.c
> +++ b/drivers/gpu/drm/tegra/hdmi.c
> @@ -658,7 +658,7 @@ static void tegra_hdmi_write_infopack(struct tegra_hdmi *hdmi, const void *data,
>  {
>  	const u8 *ptr = data;
>  	unsigned long offset;
> -	size_t i, j;
> +	size_t i;
>  	u32 value;
>  
>  	switch (ptr[0]) {
> @@ -691,7 +691,7 @@ static void tegra_hdmi_write_infopack(struct tegra_hdmi *hdmi, const void *data,
>  	 * - subpack_low: bytes 0 - 3
>  	 * - subpack_high: bytes 4 - 6 (with byte 7 padded to 0x00)
>  	 */
> -	for (i = 3, j = 0; i < size; i += 7, j += 8) {
> +	for (i = 3; i < size; i += 7) {
>  		size_t rem = size - i, num = min_t(size_t, rem, 4);
>  
>  		value = tegra_hdmi_subpack(&ptr[i], num);
> diff --git a/drivers/gpu/drm/tegra/sor.c b/drivers/gpu/drm/tegra/sor.c
> index 21f3dfdcc5c9..bc7dd562cf6b 100644
> --- a/drivers/gpu/drm/tegra/sor.c
> +++ b/drivers/gpu/drm/tegra/sor.c
> @@ -1864,7 +1864,7 @@ static void tegra_sor_hdmi_write_infopack(struct tegra_sor *sor,
>  {
>  	const u8 *ptr = data;
>  	unsigned long offset;
> -	size_t i, j;
> +	size_t i;
>  	u32 value;
>  
>  	switch (ptr[0]) {
> @@ -1897,7 +1897,7 @@ static void tegra_sor_hdmi_write_infopack(struct tegra_sor *sor,
>  	 * - subpack_low: bytes 0 - 3
>  	 * - subpack_high: bytes 4 - 6 (with byte 7 padded to 0x00)
>  	 */
> -	for (i = 3, j = 0; i < size; i += 7, j += 8) {
> +	for (i = 3; i < size; i += 7) {
>  		size_t rem = size - i, num = min_t(size_t, rem, 4);
>  
>  		value = tegra_sor_hdmi_subpack(&ptr[i], num);
> 

Reviewed-by: Mikko Perttunen <mperttunen@nvidia.com>