On 29/04/2024 17:05, Ricardo Ribalda wrote: > Unless the fps is smaller than 0.000232829 fps, this fits in a 32 bit > number. Make that explicit. > > Found by cocci: > drivers/media/platform/qcom/venus/vdec.c:488:1-7: WARNING: do_div() does a 64-by-32 division, please consider using div64_u64 instead. > > Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@xxxxxxxxxx> > Signed-off-by: Ricardo Ribalda <ribalda@xxxxxxxxxxxx> > --- > drivers/media/platform/qcom/venus/vdec.c | 7 ++----- > 1 file changed, 2 insertions(+), 5 deletions(-) > > diff --git a/drivers/media/platform/qcom/venus/vdec.c b/drivers/media/platform/qcom/venus/vdec.c > index 29130a9441e7..2b2874aedb2d 100644 > --- a/drivers/media/platform/qcom/venus/vdec.c > +++ b/drivers/media/platform/qcom/venus/vdec.c > @@ -464,7 +464,7 @@ static int vdec_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a) > struct venus_inst *inst = to_inst(file); > struct v4l2_captureparm *cap = &a->parm.capture; > struct v4l2_fract *timeperframe = &cap->timeperframe; > - u64 us_per_frame, fps; > + u64 us_per_frame; > > if (a->type != V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE && > a->type != V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) > @@ -484,10 +484,7 @@ static int vdec_s_parm(struct file *file, void *fh, struct v4l2_streamparm *a) > if (!us_per_frame) > return -EINVAL; > > - fps = (u64)USEC_PER_SEC; > - do_div(fps, us_per_frame); > - > - inst->fps = fps; > + inst->fps = USEC_PER_SEC / (u32)us_per_frame; What happens if us_per_frame > USEC_PER_SEC? inst->fps is now 0, and I wonder what issues that may cause. I will drop this patch from the PR, as it is probably wise to return an error if us_per_frame > USEC_PER_SEC. The same issue is present with the venc patch (24/26), but that wasn't included in the PR anyway. Regards, Hans > inst->timeperframe = *timeperframe; > > return 0; >
