[PATCH v3 0/2] media: Fix CI warnings for 6.19

[PATCH v3 0/2] media: Fix CI warnings for 6.19

[Ricardo Ribalda]

New kernel version, new warnings.

This series only introduces a new patch:
media: iris: Document difference in size during allocation

The other one has been already sent to linux-media or linux-next ML,
but they have not found their way into the tree.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
Changes in v3:
- Fix fps calculation (Thanks Dikshita)
- Link to v2: https://lore.kernel.org/r/20251216-warnings-6-19-v2-0-12075e3dece7@chromium.org

Changes in v2:
- Remove already-landed patches
- Use ->inst in Document difference (Thanks Laurent)
- Simplify division (Thanks Dimitry)
- Link to v1: https://lore.kernel.org/r/20251203-warnings-6-19-v1-0-25308e136bca@chromium.org

---
Ricardo Ribalda (2):
      media: iris: Document difference in size during allocation
      media: iris: Fix fps calculation

 drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c |  7 ++++++-
 drivers/media/platform/qcom/iris/iris_venc.c             | 15 +++++----------
 2 files changed, 11 insertions(+), 11 deletions(-)
---
base-commit: b70886ff5833cf499e77af77d2324ce8f68b60ce
change-id: 20251202-warnings-6-19-960d9b686cff

Best regards,
-- 
Ricardo Ribalda <ribalda@chromium.org>

[PATCH v3 1/2] media: iris: Document difference in size during allocation

[Ricardo Ribalda]

As we get ready for kzalloc checking for invalid sizes, let's add
documentation for the cases where the size is different but valid.

This patch fixes this cocci warning:
./platform/qcom/iris/iris_hfi_gen2_command.c:1215:9-25: WARNING: casting value returned by memory allocation function to (struct iris_inst *) is useless.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
index f9129553209922fda548ca320494ae6ae797854c..c120ea3594fb5d0f40d6b9a7c67ffc28c42109f0 100644
--- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
+++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
@@ -1212,5 +1212,10 @@ void iris_hfi_gen2_command_ops_init(struct iris_core *core)
 
 struct iris_inst *iris_hfi_gen2_get_instance(void)
 {
-	return (struct iris_inst *)kzalloc(sizeof(struct iris_inst_hfi_gen2), GFP_KERNEL);
+	struct iris_inst_hfi_gen2 *out;
+
+	/* The allocation is intentionally larger than struct iris_inst. */
+	out = kzalloc(sizeof(*out), GFP_KERNEL);
+
+	return &out->inst;
 }

-- 
2.52.0.358.g0dd7633a29-goog

[PATCH v3 2/2] media: iris: Fix fps calculation

[Ricardo Ribalda]

iris_venc_s_param() uses do_div to divide two 64 bits operators, this is
wrong. Luckily for us, both of the operators fit in 32 bits, so we can use
a normal division.

Now that we are at it, mark the fps smaller than 1 as invalid, the code
does not seem to handle them properly.

The following cocci warning is fixed with this patch:
./platform/qcom/iris/iris_venc.c:378:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_u64 instead

Fixes: 4ff586ff28e3 ("media: iris: Add support for G/S_PARM for encoder video device")
Reviewed-by: Dikshita Agarwal <dikshita.agarwal@oss.qualcomm.com>
Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
---
 drivers/media/platform/qcom/iris/iris_venc.c | 15 +++++----------
 1 file changed, 5 insertions(+), 10 deletions(-)

diff --git a/drivers/media/platform/qcom/iris/iris_venc.c b/drivers/media/platform/qcom/iris/iris_venc.c
index 5830eba93c68b27fa9db87bac63a691eaca338d2..0ed5018f9fe3326f5bcc1678e854589c65e8a954 100644
--- a/drivers/media/platform/qcom/iris/iris_venc.c
+++ b/drivers/media/platform/qcom/iris/iris_venc.c
@@ -382,8 +382,7 @@ int iris_venc_s_param(struct iris_inst *inst, struct v4l2_streamparm *s_parm)
 	struct v4l2_fract *timeperframe = NULL;
 	u32 default_rate = DEFAULT_FPS;
 	bool is_frame_rate = false;
-	u64 us_per_frame, fps;
-	u32 max_rate;
+	u32 fps, max_rate;
 
 	int ret = 0;
 
@@ -405,23 +404,19 @@ int iris_venc_s_param(struct iris_inst *inst, struct v4l2_streamparm *s_parm)
 			timeperframe->denominator = default_rate;
 	}
 
-	us_per_frame = timeperframe->numerator * (u64)USEC_PER_SEC;
-	do_div(us_per_frame, timeperframe->denominator);
-
-	if (!us_per_frame)
+	fps = timeperframe->denominator / timeperframe->numerator;
+	if (!fps)
 		return -EINVAL;
 
-	fps = (u64)USEC_PER_SEC;
-	do_div(fps, us_per_frame);
 	if (fps > max_rate) {
 		ret = -ENOMEM;
 		goto reset_rate;
 	}
 
 	if (is_frame_rate)
-		inst->frame_rate = (u32)fps;
+		inst->frame_rate = fps;
 	else
-		inst->operating_rate = (u32)fps;
+		inst->operating_rate = fps;
 
 	if ((s_parm->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE && vb2_is_streaming(src_q)) ||
 	    (s_parm->type == V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE && vb2_is_streaming(dst_q))) {

-- 
2.52.0.358.g0dd7633a29-goog

Re: [PATCH v3 1/2] media: iris: Document difference in size during allocation

[Bryan O'Donoghue]

On 23/12/2025 10:02, Ricardo Ribalda wrote:
> As we get ready for kzalloc checking for invalid sizes, let's add
> documentation for the cases where the size is different but valid.
> 
> This patch fixes this cocci warning:
> ./platform/qcom/iris/iris_hfi_gen2_command.c:1215:9-25: WARNING: casting value returned by memory allocation function to (struct iris_inst *) is useless.
> 
> Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
> ---
>   drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c | 7 ++++++-
>   1 file changed, 6 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c b/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
> index f9129553209922fda548ca320494ae6ae797854c..c120ea3594fb5d0f40d6b9a7c67ffc28c42109f0 100644
> --- a/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
> +++ b/drivers/media/platform/qcom/iris/iris_hfi_gen2_command.c
> @@ -1212,5 +1212,10 @@ void iris_hfi_gen2_command_ops_init(struct iris_core *core)
> 
>   struct iris_inst *iris_hfi_gen2_get_instance(void)
>   {
> -	return (struct iris_inst *)kzalloc(sizeof(struct iris_inst_hfi_gen2), GFP_KERNEL);
> +	struct iris_inst_hfi_gen2 *out;
> +
> +	/* The allocation is intentionally larger than struct iris_inst. */
> +	out = kzalloc(sizeof(*out), GFP_KERNEL);
> +
> +	return &out->inst;
>   }
> 
> --
> 2.52.0.358.g0dd7633a29-goog
> 
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>

---
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