diff options
Diffstat (limited to 'media-pwc-fix-the-urb-buffer-allocation.patch')
| -rw-r--r-- | media-pwc-fix-the-urb-buffer-allocation.patch | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/media-pwc-fix-the-urb-buffer-allocation.patch b/media-pwc-fix-the-urb-buffer-allocation.patch new file mode 100644 index 000000000..413868bfb --- /dev/null +++ b/media-pwc-fix-the-urb-buffer-allocation.patch @@ -0,0 +1,58 @@ +From MAILER-DAEMON Wed Jan 27 14:16:57 2021 +From: Takashi Iwai <tiwai@suse.de> +To: Hans Verkuil <hverkuil@xs4all.nl> +Cc: Mauro Carvalho Chehab <mchehab@kernel.org>, linux-media@vger.kernel.org, linux-kernel@vger.kernel.org +Subject: [PATCH] media: pwc: Fix the URB buffer allocation +Date: Thu, 21 Jan 2021 21:28:55 +0100 +Message-Id: <20210121202855.17400-1-tiwai@suse.de> +List-ID: <linux-media.vger.kernel.org> +X-Mailing-List: linux-media@vger.kernel.org +MIME-Version: 1.0 +Content-Type: text/plain; charset="utf-8" +Content-Transfer-Encoding: 7bit + +The URB buffer allocation of pwc driver involves with the +dma_map_single(), and it needs to pass the right device. Currently it +passes usb_device.dev, but it's no real device that manages the DMA. +Since the passed device has no DMA mask set up, now the pwc driver +hits the WARN_ON_ONCE() check in dma_map_page_attrs() (that was +introduced in 5.10), resulting in an error at URB allocations. +Eventually this ended up with the black output. + +This patch fixes the bug by passing the proper device, the bus +controller, to make the URB allocation and map working again. + +Signed-off-by: Takashi Iwai <tiwai@suse.de> +Reviewed-by: Robert Foss <robert.foss@linaro.org> +Cc: <stable@vger.kernel.org> +BugLink: https://bugzilla.suse.com/show_bug.cgi?id=1181133 +--- + drivers/media/usb/pwc/pwc-if.c | 4 ++-- + 1 file changed, 2 insertions(+), 2 deletions(-) + +diff --git a/drivers/media/usb/pwc/pwc-if.c b/drivers/media/usb/pwc/pwc-if.c +index 61869636ec61..d771160bb168 100644 +--- a/drivers/media/usb/pwc/pwc-if.c ++++ b/drivers/media/usb/pwc/pwc-if.c +@@ -461,7 +461,7 @@ static int pwc_isoc_init(struct pwc_device *pdev) + urb->pipe = usb_rcvisocpipe(udev, pdev->vendpoint); + urb->transfer_flags = URB_ISO_ASAP | URB_NO_TRANSFER_DMA_MAP; + urb->transfer_buffer_length = ISO_BUFFER_SIZE; +- urb->transfer_buffer = pwc_alloc_urb_buffer(&udev->dev, ++ urb->transfer_buffer = pwc_alloc_urb_buffer(udev->bus->controller, + urb->transfer_buffer_length, + &urb->transfer_dma); + if (urb->transfer_buffer == NULL) { +@@ -524,7 +524,7 @@ static void pwc_iso_free(struct pwc_device *pdev) + if (urb) { + PWC_DEBUG_MEMORY("Freeing URB\n"); + if (urb->transfer_buffer) +- pwc_free_urb_buffer(&urb->dev->dev, ++ pwc_free_urb_buffer(urb->dev->bus->controller, + urb->transfer_buffer_length, + urb->transfer_buffer, + urb->transfer_dma); +-- +2.26.2 + + |