6b8c5e4bec
A problem about modprobe amphion-vpu failed is triggered with the
following log given:
[ 2208.634841] Error: Driver 'amphion-vpu' is already registered, aborting...
modprobe: ERROR: could not insert 'amphion_vpu': Device or resource busy
The reason is that vpu_driver_init() returns vpu_core_driver_init()
directly without checking its return value, if vpu_core_driver_init()
failed, it returns without unregister amphion_vpu_driver, resulting the
amphion-vpu can never be installed later.
A simple call graph is shown as below:
vpu_driver_init()
platform_driver_register() # register amphion_vpu_driver
vpu_core_driver_init()
platform_driver_register()
driver_register()
bus_add_driver()
dev = kzalloc(...) # OOM happened
# return without unregister amphion_vpu_driver
Fix by unregister amphion_vpu_driver when vpu_core_driver_init() returns
error.
Fixes: b50a64fc54af ("media: amphion: add amphion vpu device driver")
Signed-off-by: Yuan Can <yuancan@huawei.com>
Reviewed-by: ming_qian <ming.qian@nxp.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@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 Restructured Text 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.