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SubjectRe: [PATCH] media: stkwebcam: move stk_camera_read_reg() scratch buffer to struct stk_camera
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On 4/26/22 10:38 PM, Hans Verkuil wrote:
> Hi Tom,
>
> On 12/03/2022 18:30, trix@redhat.com wrote:
>> From: Tom Rix <trix@redhat.com>
>>
>> In stk_camera_read_reg() a single byte buffer is alloc-ed and
>> freed on every function call. Since the size is known,
>> move the buffer to the struct stk_camera where it will be alloc-ed
>> and freed once.
> I read the replies to this patch, but I am not certain if you still want
> this patch to be merged, or will make a v2. I have no problem applying this
> patch as-is, but I just want to have confirmation that there won't be a v2.

Merged as-is is fine.

Thanks

Tom


>
> Regards,
>
> Hans
>
>> Signed-off-by: Tom Rix <trix@redhat.com>
>> ---
>> drivers/media/usb/stkwebcam/stk-webcam.c | 11 ++---------
>> drivers/media/usb/stkwebcam/stk-webcam.h | 2 ++
>> 2 files changed, 4 insertions(+), 9 deletions(-)
>>
>> diff --git a/drivers/media/usb/stkwebcam/stk-webcam.c b/drivers/media/usb/stkwebcam/stk-webcam.c
>> index 5b822214ccc5c..787edb3d47c23 100644
>> --- a/drivers/media/usb/stkwebcam/stk-webcam.c
>> +++ b/drivers/media/usb/stkwebcam/stk-webcam.c
>> @@ -150,25 +150,18 @@ int stk_camera_write_reg(struct stk_camera *dev, u16 index, u8 value)
>> int stk_camera_read_reg(struct stk_camera *dev, u16 index, u8 *value)
>> {
>> struct usb_device *udev = dev->udev;
>> - unsigned char *buf;
>> int ret;
>>
>> - buf = kmalloc(sizeof(u8), GFP_KERNEL);
>> - if (!buf)
>> - return -ENOMEM;
>> -
>> ret = usb_control_msg(udev, usb_rcvctrlpipe(udev, 0),
>> 0x00,
>> USB_DIR_IN | USB_TYPE_VENDOR | USB_RECIP_DEVICE,
>> 0x00,
>> index,
>> - buf,
>> + &dev->read_reg_scratch,
>> sizeof(u8),
>> 500);
>> if (ret >= 0)
>> - *value = *buf;
>> -
>> - kfree(buf);
>> + *value = dev->read_reg_scratch;
>>
>> if (ret < 0)
>> return ret;
>> diff --git a/drivers/media/usb/stkwebcam/stk-webcam.h b/drivers/media/usb/stkwebcam/stk-webcam.h
>> index 14519e5308b18..136decffe9ced 100644
>> --- a/drivers/media/usb/stkwebcam/stk-webcam.h
>> +++ b/drivers/media/usb/stkwebcam/stk-webcam.h
>> @@ -105,6 +105,8 @@ struct stk_camera {
>> struct list_head sio_avail;
>> struct list_head sio_full;
>> unsigned sequence;
>> +
>> + u8 read_reg_scratch;
>> };
>>
>> #define vdev_to_camera(d) container_of(d, struct stk_camera, vdev)

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