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Tue, 29 Sep 2026 23:11:07 +0200 (CEST) Message-ID: <1db4cc111dcfcdff0042841ff71ca0e0740e5072.camel@collabora.com> Subject: Re: [PATCH] media: mediatek: vcodec: destroy core workqueue on remove From: Nicolas Dufresne To: Guangshuo Li , Tiffany Lin , Andrew-CT Chen , Yunfei Dong , Mauro Carvalho Chehab , Matthias Brugger , AngeloGioacchino Del Regno , Fei Shao , Kees Cook , Chen-Yu Tsai , Hans Verkuil , Steve Cho , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org Cc: stable@vger.kernel.org Date: Tue, 29 Sep 2026 17:11:06 -0400 In-Reply-To: <20260915115753.2411047-1-lgs201920130244@gmail.com> References: <20260915115753.2411047-1-lgs201920130244@gmail.com> Autocrypt: addr=nicolas.dufresne@collabora.com; prefer-encrypt=mutual; keydata=mDMEaCN2ixYJKwYBBAHaRw8BAQdAM0EHepTful3JOIzcPv6ekHOenE1u0vDG1gdHFrChD /e0J05pY29sYXMgRHVmcmVzbmUgPG5pY29sYXNAbmR1ZnJlc25lLmNhPoicBBMWCgBEAhsDBQsJCA cCAiICBhUKCQgLAgQWAgMBAh4HAheABQkJZfd1FiEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrjo CGQEACgkQ2UGUUSlgcvQlQwD/RjpU1SZYcKG6pnfnQ8ivgtTkGDRUJ8gP3fK7+XUjRNIA/iXfhXMN abIWxO2oCXKf3TdD7aQ4070KO6zSxIcxgNQFtDFOaWNvbGFzIER1ZnJlc25lIDxuaWNvbGFzLmR1Z nJlc25lQGNvbGxhYm9yYS5jb20+iJkEExYKAEECGwMFCwkIBwICIgIGFQoJCAsCBBYCAwECHgcCF4 AWIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCaCyyxgUJCWX3dQAKCRDZQZRRKWBy9ARJAP96pFmLffZ smBUpkyVBfFAf+zq6BJt769R0al3kHvUKdgD9G7KAHuioxD2v6SX7idpIazjzx8b8rfzwTWyOQWHC AAS0LU5pY29sYXMgRHVmcmVzbmUgPG5pY29sYXMuZHVmcmVzbmVAZ21haWwuY29tPoiZBBMWCgBBF iEE7w1SgRXEw8IaBG8S2UGUUSlgcvQFAmibrGYCGwMFCQll93UFCwkIBwICIgIGFQoJCAsCBBYCAw ECHgcCF4AACgkQ2UGUUSlgcvRObgD/YnQjfi4+L8f4fI7p1pPMTwRTcaRdy6aqkKEmKsCArzQBAK8 bRLv9QjuqsE6oQZra/RB4widZPvphs78H0P6NmpIJ Organization: Collabora Canada Content-Type: multipart/signed; micalg="pgp-sha512"; protocol="application/pgp-signature"; boundary="=-rz/nb+3HJ76xRI+V+kAt" User-Agent: Evolution 3.60.2 (3.60.2-1.fc44) MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.9.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20260929_141115_187054_A95D2740 X-CRM114-Status: GOOD ( 17.81 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org --=-rz/nb+3HJ76xRI+V+kAt Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Le mardi 15 septembre 2026 =C3=A0 19:57 +0800, Guangshuo Li a =C3=A9crit=C2= =A0: > The decoder probe allocates core_workqueue for latency-based decoder > architectures. The probe failure paths destroy the workqueue, but the > normal remove path only destroys decode_workqueue. >=20 > As a result, removing a latency-based decoder leaves core_workqueue LAT is an abbreviation to for the core responsible for entropy decoding. I = don't know what it translate to, but its not "latency", I'll do the minor edit. I= t does reduce decoding latency though :-D > allocated after the device lifetime has ended. >=20 > Destroy core_workqueue during remove for latency-based decoder > architectures, matching the cleanup performed by the probe failure > paths. >=20 > This issue was found by manual code inspection. >=20 > Fixes: 365e4ba01df4 ("media: mtk-vcodec: Add work queue for core hardware= decode") > Cc: stable@vger.kernel.org > Signed-off-by: Guangshuo Li Reviewed-by: Nicolas Dufresne > --- > .../media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c | 2 ++ > 1 file changed, 2 insertions(+) >=20 > diff --git a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_de= c_drv.c b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv= .c > index e936ed8dffba..426d060d937c 100644 > --- a/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c > +++ b/drivers/media/platform/mediatek/vcodec/decoder/mtk_vcodec_dec_drv.c > @@ -570,6 +570,8 @@ static void mtk_vcodec_dec_remove(struct platform_dev= ice *pdev) > struct mtk_vcodec_dec_dev *dev =3D platform_get_drvdata(pdev); > =20 > destroy_workqueue(dev->decode_workqueue); > + if (IS_VDEC_LAT_ARCH(dev->vdec_pdata->hw_arch)) > + destroy_workqueue(dev->core_workqueue); > =20 > if (media_devnode_is_registered(dev->mdev_dec.devnode)) { > media_device_unregister(&dev->mdev_dec); --=-rz/nb+3HJ76xRI+V+kAt Content-Type: application/pgp-signature; name="signature.asc" Content-Description: This is a digitally signed message part Content-Transfer-Encoding: 7bit -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTvDVKBFcTDwhoEbxLZQZRRKWBy9AUCarwpagAKCRDZQZRRKWBy 9DH8AQDi1rdmJFjoheKwH20vfJzgzCvgVYU5PBPqraReB1W2sgEAnGKrT/vDeefh OzjBK1cPvD9/FeMAd3jcnge8XJbQnQc= =10sJ -----END PGP SIGNATURE----- --=-rz/nb+3HJ76xRI+V+kAt--