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smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 Received: by smtp.kernel.org (Postfix) with ESMTPSA id 57AF4C4CEEB; Mon, 2 Jun 2025 07:32:10 +0000 (UTC) Message-ID: <5b2c5e93-3e5d-497e-aef5-89f3474be2c7@xs4all.nl> Date: Mon, 2 Jun 2025 09:32:08 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/3] media: uvcvideo: Refactor uvc_queue_streamon To: Ricardo Ribalda , Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org References: <20250522-uvc-fop-v1-0-3bfe7a00f31d@chromium.org> <20250522-uvc-fop-v1-1-3bfe7a00f31d@chromium.org> Content-Language: en-US, nl From: Hans Verkuil Autocrypt: addr=hverkuil@xs4all.nl; keydata= xsFNBFQ84W0BEAC7EF1iL4s3tY8cRTVkJT/297h0Hz0ypA+ByVM4CdU9sN6ua/YoFlr9k0K4 BFUlg7JzJoUuRbKxkYb8mmqOe722j7N3HO8+ofnio5cAP5W0WwDpM0kM84BeHU0aPSTsWiGR yw55SOK2JBSq7hueotWLfJLobMWhQii0Zd83hGT9SIt9uHaHjgwmtTH7MSTIiaY6N14nw2Ud C6Uykc1va0Wqqc2ov5ihgk/2k2SKa02ookQI3e79laOrbZl5BOXNKR9LguuOZdX4XYR3Zi6/ BsJ7pVCK9xkiVf8svlEl94IHb+sa1KrlgGv3fn5xgzDw8Z222TfFceDL/2EzUyTdWc4GaPMC E/c1B4UOle6ZHg02+I8tZicjzj5+yffv1lB5A1btG+AmoZrgf0X2O1B96fqgHx8w9PIpVERN YsmkfxvhfP3MO3oHh8UY1OLKdlKamMneCLk2up1Zlli347KMjHAVjBAiy8qOguKF9k7HOjif JCLYTkggrRiEiE1xg4tblBNj8WGyKH+u/hwwwBqCd/Px2HvhAsJQ7DwuuB3vBAp845BJYUU3 06kRihFqbO0vEt4QmcQDcbWINeZ2zX5TK7QQ91ldHdqJn6MhXulPKcM8tCkdD8YNXXKyKqNl UVqXnarz8m2JCbHgjEkUlAJCNd6m3pfESLZwSWsLYL49R5yxIwARAQABzSFIYW5zIFZlcmt1 aWwgPGh2ZXJrdWlsQHhzNGFsbC5ubD7CwZUEEwEKAD8CGwMGCwkIBwMCBhUIAgkKCwQWAgMB Ah4BAheAFiEEBSzee8IVBTtonxvKvS1hSGYUO0wFAmaU3GkFCRf7lXsACgkQvS1hSGYUO0wZ cw//cLMiaV+p2rCyzdpDjWon2XD6M646THYvqXLb9eVWicFlVG78kNtHrHyEWKPhN3OdWWjn kOzXseVR/nS6vZvqCaT3rwgh3ZMb0GvOQk1/7V8UbcIERy036AjQoZmKo5tEDIv48MSvqxjj H6wbKXbCyvnIwpGICLyb0xAwvvpTaJkwZjvGqeo5EL0Z+cQ8fCelfKNO5CFFP3FNd3dH8wU6 CHRtdZE03iIVEWpgCTjsG2zwsX/CKfPx0EKcrQajW3Tc50Jm0uuRUEKCVphlYORAPtFAF1dj Ly8zpN1bEXH+0FDXe/SHhzbvgS4sL0J4KQCCZ/GcbKh/vsDC1VLsGS5C7fKOhAtOkUPWRjF+ kOEEcTOROMMvSUVokO+gCdb9nA/e3WMgiTwWRumWy5eCEnCpM9+rfI2HzTeACrVgGEDkOTHW eaGHEy8nS9a25ejQzsBhi+T7MW53ZTIjklR7dFl/uuK+EJ6DLbDpVbwyYo2oeiwP+sf8/Rgv WfJv4wzfUo/JABwrsbfWfycVZwFWBzqq+TaKFkMPm017dkLdg4MzxvvTMP7nKfJxU1bQ2OOr xkPk5KDcz+aRYBvTqEXgYZ6OZtnOUFKD+uPlbWf68vuz/1iFbQYnNJkTxwWhiIMN7BULK74d Ek89MU7JlbYNSv0v21lRF+uDo0J6zyoTt0ZxSPzOwU0EVDzhbQEQANzLiI6gHkIhBQKeQaYs p2SSqF9c++9LOy5x6nbQ4s0X3oTKaMGfBZuiKkkU6NnHCSa0Az5ScRWLaRGu1PzjgcVwzl5O sDawR1BtOG/XoPRNB2351PRp++W8TWo2viYYY0uJHKFHML+ku9q0P+NkdTzFGJLP+hn7x0RT DMbhKTHO3H2xJz5TXNE9zTJuIfGAz3ShDpijvzYieY330BzZYfpgvCllDVM5E4XgfF4F/N90 wWKu50fMA01ufwu+99GEwTFVG2az5T9SXd7vfSgRSkzXy7hcnxj4IhOfM6Ts85/BjMeIpeqy TDdsuetBgX9DMMWxMWl7BLeiMzMGrfkJ4tvlof0sVjurXibTibZyfyGR2ricg8iTbHyFaAzX 2uFVoZaPxrp7udDfQ96sfz0hesF9Zi8d7NnNnMYbUmUtaS083L/l2EDKvCIkhSjd48XF+aO8 VhrCfbXWpGRaLcY/gxi2TXRYG9xCa7PINgz9SyO34sL6TeFPSZn4bPQV5O1j85Dj4jBecB1k z2arzwlWWKMZUbR04HTeAuuvYvCKEMnfW3ABzdonh70QdqJbpQGfAF2p4/iCETKWuqefiOYn pR8PqoQA1DYv3t7y9DIN5Jw/8Oj5wOeEybw6vTMB0rrnx+JaXvxeHSlFzHiD6il/ChDDkJ9J /ejCHUQIl40wLSDRABEBAAHCwXwEGAEKACYCGwwWIQQFLN57whUFO2ifG8q9LWFIZhQ7TAUC ZpTcxwUJF/uV2gAKCRC9LWFIZhQ7TMlPD/9ppgrN4Z9gXta9IdS8a+0E7lj/dc0LnF9T6MMq aUC+CFffTiOoNDnfXh8sfsqTjAT50TsVpdlH6YyPlbU5FR8bC8wntrJ6ZRWDdHJiCDLqNA/l GVtIKP1YW8fA01thMcVUyQCdVUqnByMJiJQDzZYrX+E/YKUTh2RL5Ye0foAGE7SGzfZagI0D OZN92w59e1Jg3zBhYXQIjzBbhGIy7usBfvE882GdUbP29bKfTpcOKkJIgO6K+w82D/1d5TON SD146+UySmEnjYxHI8kBYaZJ4ubyYrDGgXT3jIBPq8i9iZP3JSeZ/0F9UIlX4KeMSG8ymgCR SqL1y9pl9R2ewCepCahEkTT7IieGUzJZz7fGUaxrSyexPE1+qNosfrUIu3yhRA6AIjhwPisl aSwDxLI6qWDEQeeWNQaYUSEIFQ5XkZxd/VN8JeMwGIAq17Hlym+JzjBkgkm1LV9LXw9D8MQL e8tSeEXX8BZIen6y/y+U2CedzEsMKGjy5WNmufiPOzB3q2JwFQCw8AoNic7soPN9CVCEgd2r XS+OUZb8VvEDVRSK5Yf79RveqHvmhAdNOVh70f5CvwR/bfX/Ei2Szxz47KhZXpn1lxmcds6b LYjTAZF0anym44vsvOEuQg3rqxj/7Hiz4A3HIkrpTWclV6ru1tuGp/ZJ7aY8bdvztP2KTw== In-Reply-To: <20250522-uvc-fop-v1-1-3bfe7a00f31d@chromium.org> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 22/05/2025 19:58, Ricardo Ribalda wrote: > Do uvc_pm_get before we call uvc_queue_streamon. Although the current > code is correct, uvc_ioctl_streamon is allways called after uvc_pm_get, allways -> always > this change makes the code more resiliant to future changes. I would add that this change also avoids calling streamoff, which is a rather ugly thing to do. > > Suggested-by: Laurent Pinchart > Signed-off-by: Ricardo Ribalda Reviewed-by: Hans Verkuil Regards, Hans > --- > drivers/media/usb/uvc/uvc_v4l2.c | 7 ++++--- > 1 file changed, 4 insertions(+), 3 deletions(-) > > diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c > index 668a4e9d772c6d91f045ca75e2744b3a6c69da6b..862b4e34e5b629cf324479a9bb59ebe8784ccd5d 100644 > --- a/drivers/media/usb/uvc/uvc_v4l2.c > +++ b/drivers/media/usb/uvc/uvc_v4l2.c > @@ -853,15 +853,16 @@ static int uvc_ioctl_streamon(struct file *file, void *fh, > if (handle->is_streaming) > return 0; > > - ret = uvc_queue_streamon(&stream->queue, type); > + ret = uvc_pm_get(stream->dev); > if (ret) > return ret; > > - ret = uvc_pm_get(stream->dev); > + ret = uvc_queue_streamon(&stream->queue, type); > if (ret) { > - uvc_queue_streamoff(&stream->queue, type); > + uvc_pm_put(stream->dev); > return ret; > } > + > handle->is_streaming = true; > > return 0; >