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[35.236.236.5]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-466be77cf7bsm371171cf.89.2024.11.27.04.14.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Nov 2024 04:14:56 -0800 (PST) From: Ricardo Ribalda Date: Wed, 27 Nov 2024 12:14:49 +0000 Subject: [PATCH v2 1/4] media: uvcvideo: Remove dangling pointers Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241127-uvc-fix-async-v2-1-510aab9570dd@chromium.org> References: <20241127-uvc-fix-async-v2-0-510aab9570dd@chromium.org> In-Reply-To: <20241127-uvc-fix-async-v2-0-510aab9570dd@chromium.org> To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab , Guennadi Liakhovetski Cc: Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda , stable@vger.kernel.org X-Mailer: b4 0.13.0 When an async control is written, we copy a pointer to the file handle that started the operation. That pointer will be used when the device is done. Which could be anytime in the future. If the user closes that file descriptor, its structure will be freed, and there will be one dangling pointer per pending async control, that the driver will try to use. Clean all the dangling pointers during release(). To avoid adding a performance penalty in the most common case (no async operation). A counter has been introduced with some logic to make sure that it is properly handled. Cc: stable@vger.kernel.org Fixes: e5225c820c05 ("media: uvcvideo: Send a control event when a Control Change interrupt arrives") Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_ctrl.c | 38 ++++++++++++++++++++++++++++++++++++-- drivers/media/usb/uvc/uvc_v4l2.c | 2 ++ drivers/media/usb/uvc/uvcvideo.h | 8 +++++++- 3 files changed, 45 insertions(+), 3 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 4fe26e82e3d1..b6af4ff92cbd 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1589,7 +1589,12 @@ void uvc_ctrl_status_event(struct uvc_video_chain *chain, mutex_lock(&chain->ctrl_mutex); handle = ctrl->handle; - ctrl->handle = NULL; + if (handle) { + ctrl->handle = NULL; + WARN_ON(!handle->pending_async_ctrls); + if (handle->pending_async_ctrls) + handle->pending_async_ctrls--; + } list_for_each_entry(mapping, &ctrl->info.mappings, list) { s32 value = __uvc_ctrl_get_value(mapping, data); @@ -2046,8 +2051,11 @@ int uvc_ctrl_set(struct uvc_fh *handle, mapping->set(mapping, value, uvc_ctrl_data(ctrl, UVC_CTRL_DATA_CURRENT)); - if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS) + if (ctrl->info.flags & UVC_CTRL_FLAG_ASYNCHRONOUS) { + if (!ctrl->handle) + handle->pending_async_ctrls++; ctrl->handle = handle; + } ctrl->dirty = 1; ctrl->modified = 1; @@ -2770,6 +2778,32 @@ int uvc_ctrl_init_device(struct uvc_device *dev) return 0; } +void uvc_ctrl_cleanup_fh(struct uvc_fh *handle) +{ + struct uvc_entity *entity; + + guard(mutex)(&handle->chain->ctrl_mutex); + + if (!handle->pending_async_ctrls) + return; + + list_for_each_entry(entity, &handle->chain->dev->entities, list) { + for (unsigned int i = 0; i < entity->ncontrols; ++i) { + struct uvc_control *ctrl = &entity->controls[i]; + + if (ctrl->handle != handle) + continue; + + ctrl->handle = NULL; + if (WARN_ON(!handle->pending_async_ctrls)) + continue; + handle->pending_async_ctrls--; + } + } + + WARN_ON(handle->pending_async_ctrls); +} + /* * Cleanup device controls. */ diff --git a/drivers/media/usb/uvc/uvc_v4l2.c b/drivers/media/usb/uvc/uvc_v4l2.c index 97c5407f6603..b425306a3b8c 100644 --- a/drivers/media/usb/uvc/uvc_v4l2.c +++ b/drivers/media/usb/uvc/uvc_v4l2.c @@ -652,6 +652,8 @@ static int uvc_v4l2_release(struct file *file) uvc_dbg(stream->dev, CALLS, "%s\n", __func__); + uvc_ctrl_cleanup_fh(handle); + /* Only free resources if this is a privileged handle. */ if (uvc_has_privileges(handle)) uvc_queue_release(&stream->queue); diff --git a/drivers/media/usb/uvc/uvcvideo.h b/drivers/media/usb/uvc/uvcvideo.h index 07f9921d83f2..c68659b70221 100644 --- a/drivers/media/usb/uvc/uvcvideo.h +++ b/drivers/media/usb/uvc/uvcvideo.h @@ -337,7 +337,10 @@ struct uvc_video_chain { struct uvc_entity *processing; /* Processing unit */ struct uvc_entity *selector; /* Selector unit */ - struct mutex ctrl_mutex; /* Protects ctrl.info */ + struct mutex ctrl_mutex; /* + * Protects ctrl.info and + * uvc_fh.pending_async_ctrls + */ struct v4l2_prio_state prio; /* V4L2 priority state */ u32 caps; /* V4L2 chain-wide caps */ @@ -612,6 +615,7 @@ struct uvc_fh { struct uvc_video_chain *chain; struct uvc_streaming *stream; enum uvc_handle_state state; + unsigned int pending_async_ctrls; }; struct uvc_driver { @@ -797,6 +801,8 @@ int uvc_ctrl_is_accessible(struct uvc_video_chain *chain, u32 v4l2_id, int uvc_xu_ctrl_query(struct uvc_video_chain *chain, struct uvc_xu_control_query *xqry); +void uvc_ctrl_cleanup_fh(struct uvc_fh *handle); + /* Utility functions */ struct usb_host_endpoint *uvc_find_endpoint(struct usb_host_interface *alts, u8 epaddr); From patchwork Wed Nov 27 12:14:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Ribalda X-Patchwork-Id: 13886958 Received: from mail-yb1-f181.google.com (mail-yb1-f181.google.com [209.85.219.181]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id B2BCC1FBCBF for ; Wed, 27 Nov 2024 12:14:59 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.181 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732709701; cv=none; b=V/03hckG6mjsRt4UAAcy96f14GiBb298yuvjYiLAfg2WO3oKFz1CGETMjvmOjJkWyVPdJLmoHxxYnGAoWHnjzi2wy8x0HMiWPQqZ901wJ+EzxVMZzKM9/UBi5FVzIc2G3U/FYlpVBpFt1qNFxMSv1drtQmi0qceYsjzfehRXd7E= ARC-Message-Signature: i=1; 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[35.236.236.5]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-466be77cf7bsm371171cf.89.2024.11.27.04.14.57 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Nov 2024 04:14:58 -0800 (PST) From: Ricardo Ribalda Date: Wed, 27 Nov 2024 12:14:50 +0000 Subject: [PATCH v2 2/4] media: uvcvideo: Do not set an async control owned by other fh Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241127-uvc-fix-async-v2-2-510aab9570dd@chromium.org> References: <20241127-uvc-fix-async-v2-0-510aab9570dd@chromium.org> In-Reply-To: <20241127-uvc-fix-async-v2-0-510aab9570dd@chromium.org> To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab , Guennadi Liakhovetski Cc: Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda , stable@vger.kernel.org X-Mailer: b4 0.13.0 If a file handle is waiting for a response from an async control, avoid that other file handle operate with it. Without this patch, the first file handle will never get the event associated with that operation, which can lead to endless loops in applications. Eg: If an application A wants to change the zoom and to know when the operation has completed: it will open the video node, subscribe to the zoom event, change the control and wait for zoom to finish. If before the zoom operation finishes, another application B changes the zoom, the first app A will loop forever. Cc: stable@vger.kernel.org Fixes: e5225c820c05 ("media: uvcvideo: Send a control event when a Control Change interrupt arrives") Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_ctrl.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index b6af4ff92cbd..3f8ae35cb3bc 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1955,6 +1955,10 @@ int uvc_ctrl_set(struct uvc_fh *handle, if (!(ctrl->info.flags & UVC_CTRL_FLAG_SET_CUR)) return -EACCES; + /* Other file handle is waiting a response from this async control. */ + if (ctrl->handle && ctrl->handle != handle) + return -EBUSY; + /* Clamp out of range values. */ switch (mapping->v4l2_type) { case V4L2_CTRL_TYPE_INTEGER: From patchwork Wed Nov 27 12:14:51 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Ribalda X-Patchwork-Id: 13886959 Received: from mail-qt1-f178.google.com (mail-qt1-f178.google.com [209.85.160.178]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 586D91FBE9E for ; Wed, 27 Nov 2024 12:15:01 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.178 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732709702; cv=none; b=AE4T7nvOQ/PUp670vZ/UM2RbJUoiGAN/b5h51caXZ8Ve+DJXrfjuSwjvsipJaMRv2pPxg4I2CZG3EGWRpjoJnQ6p4RTei6idhTiDVvA52l89UcgylMJe5gxTG5MYZh7BtVmoqUkxzkSjIcNAEfIot1yJ+YlBUpTgQ2yBAmkqGTA= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732709702; c=relaxed/simple; bh=qscvc4/+8WAanATzK91OtjUbi7ikSGl3avQzHX8sCU8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=PH+q2beqd+YnYqgncNr6dTrVD8ve+ImANBJCj+q+7kQlzb6+7tM6qWV2TH5yFGDwuagP0wXglJz4b/Zf/EZwVyOjNZ15Dd/ajZw96kMYeRAjMMb46xI/CvPv4pkDhQeIvPpySJHrlFHW6vJoBI+oK+t60kgN2+Z8p0rSK+r5meU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=NyzKEgCq; arc=none smtp.client-ip=209.85.160.178 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="NyzKEgCq" Received: by mail-qt1-f178.google.com with SMTP id d75a77b69052e-4668983b04eso30764821cf.1 for ; Wed, 27 Nov 2024 04:15:01 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1732709700; x=1733314500; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=lkd0hfrtGi6wFG+eppx3CwdzsgWeJcO0RuYZmaKBy34=; b=NyzKEgCq8Wq1LGDpojFYKQpXwY78+p1Smzh8OPbK8G3A0e24oBbEs5KACNH+gHCigf 3mdSo+7yWgpiR842B+/p0d7uqGRTAqUUnk7inw1M9PJ/7ahVbgqIRJqlFINF/bu1okuz mIN784VoxApKOZ8sZADAvdQ8acfofy8r8PoDg= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732709700; x=1733314500; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=lkd0hfrtGi6wFG+eppx3CwdzsgWeJcO0RuYZmaKBy34=; b=B/HIIvH+TA3bxLDuSg7C7yP2lzb1H0z9zHz1V5ml4/k7I8GTJdeRT7hZo9brMpf6PZ lLy7gqBnn0hMdx5EJYz6UdZ+wfQcFkc3L6ZhIBvzFw0tPaiWfAwzytPkjDMhnymykj8k bz6cYCoxhdQHU6bH3uv+kTQVaGAAVPjnl7MIwkXReH5Cmw9zd4rzkUmLRk/jD0l8HOFV t8rN9idoZgBjFr1gf/wk1GLhIIOblk7fT5cIizfJAJUWtDrJylXppDKbAkcoMhaKz3jS Kn18cnhQbAsvJXjmSQOVsJID2DI4jCRVf3HDFEW6PJuH+4GlGYdpf8mOZw9eC+DzfQkZ lBqQ== X-Forwarded-Encrypted: i=1; AJvYcCVz7mIFyvm/s6Ep6JR2Id6ew0Vw4UatrORIS/O+4qDAwOk432dxKJZmroSmxXQp2SZ2MLX2zMmwwAco8Q==@vger.kernel.org X-Gm-Message-State: AOJu0YwwhxzkMTu9VOp8qu+jsQy16GNF8r6+n9ijm425v+LqFxSc13jO njIKOKjJOkKPRqYcFrF2oT4yRVPdSc82JTt5+ee64oHT3q5wl/AwKCBPN9ydqg== X-Gm-Gg: ASbGnctf/JlPHeAXTvC3dhm2hwIn4kP858uB/D/nJRz7ROCWnnJ0G+XNZjFFXIN5//L nkftkg0umQfP33avSlDhhgZ1xmbZXIScQk0mIyQQx2BNE5ALuJJ4TtxyeLcS+ZK6DK4c0wpSc2G Ao9qqNTbF8rTKxL9sr8LN6w7rtdI6M4Za6gQzJkjFdZoEMjIO23Rplmg9JouAwcbnOuUz2HCmR8 fASYDtRdN4sJAIVetMgpl1MfDknrtnLzkQdAZ36Yoa+HxJIWfYWlzpCBdqMheAR7Mg/3lAycmxK fbgU4EfT4CdUHNSXrRNXm/HA X-Google-Smtp-Source: AGHT+IEJp12s0m0Yk1hs2ex6FW8MZF5oXzJGL5WHwF8YV678OPemZ9ffP4a8dvh2jsPCipIpLWswVw== X-Received: by 2002:a05:622a:14ce:b0:466:8543:b96f with SMTP id d75a77b69052e-466b34d362emr28958981cf.6.1732709700243; Wed, 27 Nov 2024 04:15:00 -0800 (PST) Received: from denia.c.googlers.com (5.236.236.35.bc.googleusercontent.com. [35.236.236.5]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-466be77cf7bsm371171cf.89.2024.11.27.04.14.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Nov 2024 04:14:59 -0800 (PST) From: Ricardo Ribalda Date: Wed, 27 Nov 2024 12:14:51 +0000 Subject: [PATCH v2 3/4] media: uvcvideo: Annotate lock requirements for uvc_ctrl_set Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241127-uvc-fix-async-v2-3-510aab9570dd@chromium.org> References: <20241127-uvc-fix-async-v2-0-510aab9570dd@chromium.org> In-Reply-To: <20241127-uvc-fix-async-v2-0-510aab9570dd@chromium.org> To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab , Guennadi Liakhovetski Cc: Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda X-Mailer: b4 0.13.0 Make it explicit that the function is always called with ctrl_mutex being held. Suggested-by: Laurent Pinchart Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_ctrl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 3f8ae35cb3bc..99ddc5e9dff8 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1946,6 +1946,8 @@ int uvc_ctrl_set(struct uvc_fh *handle, s32 max; int ret; + lockdep_assert_held(&chain->ctrl_mutex); + if (__uvc_query_v4l2_class(chain, xctrl->id, 0) >= 0) return -EACCES; From patchwork Wed Nov 27 12:14:52 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ricardo Ribalda X-Patchwork-Id: 13886960 Received: from mail-qt1-f176.google.com (mail-qt1-f176.google.com [209.85.160.176]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D7E51FC101 for ; Wed, 27 Nov 2024 12:15:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.160.176 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732709705; cv=none; b=Z6wOhmXYZy6bXBfVNnPYJP8nfZUhXUVaBL0NcinqpR6lWFfzA81AC08mLfiwD0AiDnPy45QjJCvbO4C1VwyFbcXfqWXdDHoixnqbBp8yAyGXXIUq0fH53Toh0sbs/wwkIQcZoM/CdQPtek8QkWNiaNe1BWxgxxGhtduH+mKbosE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1732709705; c=relaxed/simple; bh=yv3h2vzWiCSkYvOmOVZOnLbH4e+vqdmkttphrGsTdA8=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=X0cc/34E0yU9E/OiyjAef+epWPuKn+m5UxbmaIRWLLN9XHwCcUpGiEAGn79Vaw/8I+Gsq5DRYdAxYWhZ2Jl0a+4f1Y4Sb1fK2Bd9CInieUIsIspHQQ9c0yCKsAuEWocUytFLG1/0+RXeuvzh0XVpJ/z/NTeDECWK5xZBUMD+JXM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org; spf=pass smtp.mailfrom=chromium.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b=U+p2X9wP; arc=none smtp.client-ip=209.85.160.176 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=chromium.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=chromium.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=chromium.org header.i=@chromium.org header.b="U+p2X9wP" Received: by mail-qt1-f176.google.com with SMTP id d75a77b69052e-4668f208f10so27634591cf.3 for ; Wed, 27 Nov 2024 04:15:03 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; t=1732709702; x=1733314502; darn=vger.kernel.org; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=n6PMrA6yfmsQRKTdt+5BI8/0Y5GUPe75YZrlJGsNn64=; b=U+p2X9wPu/UMKCx3VFmxhdXB1oJWwXW2/deneWXnmYZIQkCbLIB31/26g5I7m49Vdd UivIN4yzh6Bak0ZPALYFBocZm8+pWe5XM1wATMbuQQ1I67HCA6eu3CINNvoMD/8o+i8/ ZxQOF+qi0w1t1pQMks7vO3NR3xMColOXr3MzM= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1732709702; x=1733314502; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=n6PMrA6yfmsQRKTdt+5BI8/0Y5GUPe75YZrlJGsNn64=; b=jXrxkOPM4ajkb7hSRoP57sL0OCUeb2Log4IYs70zGUVmNiabbSqP0D3CiaDyWJzlaC FwX/GKUZUHaJd7Le0l8noSshuFhfT2seVfJJ5/GfP5vMiM8n88vdSoY57SjgU222EZD6 MjLSx3sa5pf2AQhQQCpdJ/StBP98LX+jSN2lxxB8eoofnGVBTrR9MADqksD/IaO75wv5 DNU37mMk/88X41QtkgQwEuAdbDx8StgwTigWhTSacCel+EdGKU2ySggW9HfI+cYmd9Mc raQf8wt/qfDY9tR6lbhIG/eR5XEA5rR55N3+cy5w2Alr0rameZnu/e+qSfzTQPovFFxh WU8g== X-Forwarded-Encrypted: i=1; AJvYcCV/QY/aFYvLFQYlm//fvifc5QAZHWT/N0H3PwIObMv6zrrrUMvVHbltJYOV401ScHApV1McK9unBTzrNA==@vger.kernel.org X-Gm-Message-State: AOJu0YzM5eTXdeYnEG5RQyjbDhe2e1AnBG+hWOCra1Zb+FXpVwLvYKyC u9FkN+ploWPsG5ksmdfprVQ+UTzsCOk8a2kX/4l63LplN8ULQCySscS8GVYbOwb+HJtlpQKUxqc = X-Gm-Gg: ASbGncspSZm7ZNUbp8XMe+49cCClZkn9hvOFKuL5OWMMhk41ZTQ8qE2CF9QXyoT6zVV /w03ziTiL375qd5krAb/YEdkENlhuL46XFLpspzANJ7/VLqcExCENNf4QxOlyplZbJ1rVi/Fs1F KTbJFReN8muo0BHtqpp9aToJ8SDoQu5ojrwfxKw3Vz4OKDqvOdWZKbY4NRKueIZl69mbvXIixF2 B3IAjfesZ+m2Fw49p94i/GJLo+JKiseZbOa6inNVLr60wJcY65Dc+CrrrdHFWMnl2/Isw4ACttA Y55Hsngo2iW2nuAbXAY55OgV X-Google-Smtp-Source: AGHT+IHf6ueSfY60U0HfefcCmnZQ367u8xLsUq+kt1ZVbjF6qn5g8wIQB2Z8/Cf0NEGUz/Jw+SbagQ== X-Received: by 2002:ac8:594e:0:b0:460:ad52:ab0d with SMTP id d75a77b69052e-466b3516358mr37080091cf.16.1732709702235; Wed, 27 Nov 2024 04:15:02 -0800 (PST) Received: from denia.c.googlers.com (5.236.236.35.bc.googleusercontent.com. [35.236.236.5]) by smtp.gmail.com with ESMTPSA id d75a77b69052e-466be77cf7bsm371171cf.89.2024.11.27.04.15.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 27 Nov 2024 04:15:01 -0800 (PST) From: Ricardo Ribalda Date: Wed, 27 Nov 2024 12:14:52 +0000 Subject: [PATCH v2 4/4] media: uvcvideo: Remove redundant NULL assignment Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-Id: <20241127-uvc-fix-async-v2-4-510aab9570dd@chromium.org> References: <20241127-uvc-fix-async-v2-0-510aab9570dd@chromium.org> In-Reply-To: <20241127-uvc-fix-async-v2-0-510aab9570dd@chromium.org> To: Laurent Pinchart , Hans de Goede , Mauro Carvalho Chehab , Guennadi Liakhovetski Cc: Mauro Carvalho Chehab , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, Ricardo Ribalda X-Mailer: b4 0.13.0 ctrl->handle will only be different than NULL for controls that have mappings. This is because that assignment is only done inside uvc_ctrl_set() for mapped controls. Signed-off-by: Ricardo Ribalda --- drivers/media/usb/uvc/uvc_ctrl.c | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c index 99ddc5e9dff8..b9c9ff629ab6 100644 --- a/drivers/media/usb/uvc/uvc_ctrl.c +++ b/drivers/media/usb/uvc/uvc_ctrl.c @@ -1645,10 +1645,8 @@ bool uvc_ctrl_status_event_async(struct urb *urb, struct uvc_video_chain *chain, struct uvc_device *dev = chain->dev; struct uvc_ctrl_work *w = &dev->async_ctrl; - if (list_empty(&ctrl->info.mappings)) { - ctrl->handle = NULL; + if (list_empty(&ctrl->info.mappings)) return false; - } w->data = data; w->urb = urb;