Amelie Delaunay
9bb4af400c
In case of error when requesting ctrl_chan DMA channel, ctrl_chan is not
null. So the release of the dma channel leads to the following issue:
[ 4.879000] st,stm32-spdifrx 500d0000.audio-controller:
dma_request_slave_channel error -19
[ 4.888975] Unable to handle kernel NULL pointer dereference
at virtual address 000000000000003d
[...]
[ 5.096577] Call trace:
[ 5.099099] dma_release_channel+0x24/0x100
[ 5.103235] stm32_spdifrx_remove+0x24/0x60 [snd_soc_stm32_spdifrx]
[ 5.109494] stm32_spdifrx_probe+0x320/0x4c4 [snd_soc_stm32_spdifrx]
To avoid this issue, release channel only if the pointer is valid.
Fixes: 794df9448e ("ASoC: stm32: spdifrx: manage rebind issue")
Signed-off-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Signed-off-by: Olivier Moysan <olivier.moysan@foss.st.com>
Link: https://patch.msgid.link/20241105140242.527279-1-olivier.moysan@foss.st.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.