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be94215be1
If rmmod the driver during read or write, the driver will release the
resources which are used during read or write, so it is possible to
refer to NULL pointer.
Use the testcase "mtd_debug read /dev/mtd0 0xc00000 0x400000 dest_file &
sleep 0.5;rmmod spi_hisi_sfc_v3xx.ko", the issue can be reproduced in
hisi_sfc_v3xx driver.
To avoid the issue, fill the interface _get_device and _put_device of
mtd_info to grab the reference to the spi controller driver module, so
the request of rmmod the driver is rejected before read/write is finished.
Fixes:
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| README | ||
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.