Message ID | 20220920-resend-powersave-v3-5-c47856d8757e@chromium.org |
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State | New |
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charset="utf-8" Content-Transfer-Encoding: 8bit Message-Id: <20220920-resend-powersave-v3-5-c47856d8757e@chromium.org> References: <20220920-resend-powersave-v3-0-c47856d8757e@chromium.org> In-Reply-To: <20220920-resend-powersave-v3-0-c47856d8757e@chromium.org> To: Mauro Carvalho Chehab <mchehab@kernel.org> Cc: Tomasz Figa <tfiga@chromium.org>, Ricardo Ribalda <ribalda@chromium.org>, Guenter Roeck <linux@roeck-us.net>, Max Staudt <mstaudt@chromium.org>, linux-kernel@vger.kernel.org, Alan Stern <stern@rowland.harvard.edu>, Hans Verkuil <hverkuil-cisco@xs4all.nl>, Laurent Pinchart <laurent.pinchart@ideasonboard.com>, linux-media@vger.kernel.org X-Mailer: b4 0.11.0-dev-d93f8 X-Developer-Signature: v=1; a=openpgp-sha256; l=3480; i=ribalda@chromium.org; h=from:subject:message-id; bh=APLvTWouHG6W7Hdh3pI6r+3IhJhwMwT1aCPAKGfmTl4=; b=owEBbQKS/ZANAwAKAdE30T7POsSIAcsmYgBjWSLDhfVyWypDVPC0JJxEfV0bmc/qRHVqOY3owrR7 RZYSEmeJAjMEAAEKAB0WIQREDzjr+/4oCDLSsx7RN9E+zzrEiAUCY1kiwwAKCRDRN9E+zzrEiINUD/ 9Tq8I83z6Lg6tNvcsuCkWyM5/KaT/QDyXaNaM/rrVS8WeXY8HFa798+mQi9RaZ7fgEBZXOt6VLiM9g DTmY3weROqImFZ3xkflgoJNpufYIDbdhtEYuhajS6ME/n3M1K3+DN6+Ij4Mf5XyAGa7dhT0SZiZGji OPNSrwRSuPn7Sn5aNs3l6i4NTrHJ2a7CNBXrXXNFfRsrBrUykckaiCDdru0wzSWSQHSgBNbcKFXu93 EzhOYnqUcR+AYKn66FiMf3oIcyJvVgQuN8hWosQNaH9oXmwi87XJzEP899lLnyXaw7D00qnYfbIKrt qbxtxNu2NXpzVFMNZwNADeafFOdmwAQsucdcUDdtZGqf0qxFYqEAqRIx7BXrEIt6z7pfBJMjR5lq9h Lc5oechRzpecNIvq56tMKMAWNNa+dwb8r7BLReXhD+0itNp/Ya2ucpRpnd5lTCEQna9EbrbR5VCmHB iDjfncy5wAKf5VzHIwJRU7z0dYy2K03etVb7gs9BKCNQ1ICQ/+A81KwECyHhlvpsnSNVkDjothNkBo E9HuAIQjml1+iWhPoQcmeXAey2NGqW4x+oe9LuTvHby1YJd2Kt7wQrjezb2cwC/OltXzNhp2F7FCa9 u2xgAXXeXbhooW8l6NbYztriySHHRAZksfEM/iLDhz1VFLNpKvnVfuYoTZmA== X-Developer-Key: i=ribalda@chromium.org; 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Series |
media: uvcvideo: Implement granular power management
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Commit Message
Ricardo Ribalda
Oct. 26, 2022, 12:06 p.m. UTC
From: Guenter Roeck <linux@roeck-us.net> The following traceback was observed when stress testing the uvcvideo driver. config->interface[0] is NULL WARNING: CPU: 0 PID: 2757 at drivers/usb/core/usb.c:285 usb_ifnum_to_if+0x81/0x85 ^^^ added log message and WARN() to prevent crash Modules linked in: <...> CPU: 0 PID: 2757 Comm: inotify_reader Not tainted 4.19.139 #20 Hardware name: Google Phaser/Phaser, BIOS Google_Phaser.10952.0.0 08/09/2018 RIP: 0010:usb_ifnum_to_if+0x81/0x85 Code: <...> RSP: 0018:ffff9ee20141fa58 EFLAGS: 00010246 RAX: 438a0e5a525f1800 RBX: 0000000000000000 RCX: 0000000000000000 RDX: ffff975477a1de90 RSI: ffff975477a153d0 RDI: ffff975477a153d0 RBP: ffff9ee20141fa70 R08: 000000000000002c R09: 002daec189138d78 R10: 0000001000000000 R11: ffffffffa7da42e6 R12: ffff975459594800 R13: 0000000000000001 R14: 0000000000000001 R15: ffff975465376400 FS: 00007ddebffd6700(0000) GS:ffff975477a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000012c83000 CR3: 00000001bbaf8000 CR4: 0000000000340ef0 Call Trace: usb_set_interface+0x3b/0x2f3 uvc_video_stop_streaming+0x38/0x81 [uvcvideo] uvc_stop_streaming+0x21/0x49 [uvcvideo] __vb2_queue_cancel+0x33/0x249 [videobuf2_common] vb2_core_queue_release+0x1c/0x45 [videobuf2_common] uvc_queue_release+0x26/0x32 [uvcvideo] uvc_v4l2_release+0x41/0xdd [uvcvideo] v4l2_release+0x99/0xed __fput+0xf0/0x1ea task_work_run+0x7f/0xa7 do_exit+0x1d1/0x6eb do_group_exit+0x9d/0xac get_signal+0x135/0x482 do_signal+0x4a/0x63c exit_to_usermode_loop+0x86/0xa5 do_syscall_64+0x171/0x269 ? __do_page_fault+0x272/0x474 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7ddec156dc26 Code: Bad RIP value. RSP: 002b:00007ddebffd5c10 EFLAGS: 00000293 ORIG_RAX: 0000000000000017 RAX: fffffffffffffdfe RBX: 000000000000000a RCX: 00007ddec156dc26 RDX: 0000000000000000 RSI: 00007ddebffd5d28 RDI: 000000000000000a RBP: 00007ddebffd5c50 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000293 R12: 00007ddebffd5d28 R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000 When this was observed, a USB disconnect was in progress, uvc_disconnect() had returned, but usb_disable_device() was still running. Drivers are not supposed to call any USB functions after the driver disconnect function has been called. The uvcvideo driver does not follow that convention and tries to write to the disconnected USB interface anyway. This results in a variety of race conditions. To solve this specific problem, release the uvc queue from uvc_unregister_video() after the associated video devices have been unregistered. Since the function already holds the uvc queue mutex, bypass uvc_queue_release() and call vb2_queue_release() directly. Cc: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Cc: Alan Stern <stern@rowland.harvard.edu> Cc: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
diff --git a/drivers/media/usb/uvc/uvc_driver.c b/drivers/media/usb/uvc/uvc_driver.c index 70d081c9a9fe..dc43100d0f95 100644 --- a/drivers/media/usb/uvc/uvc_driver.c +++ b/drivers/media/usb/uvc/uvc_driver.c @@ -1897,6 +1897,8 @@ static void uvc_unregister_video(struct uvc_device *dev) video_unregister_device(&stream->meta.vdev); uvc_debugfs_cleanup_stream(stream); + + vb2_queue_release(&stream->queue.queue); } if (dev->int_ep)