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If the temporarily applied memory is used to set or get the xqc information, the driver releases the memory immediately after the hardware mailbox operation time exceeds the driver waiting time. However, the hardware does not cancel the operation, so the hardware may write data to released memory. Therefore, when the driver is bound to a device, the driver reserves memory for the xqc configuration. The subsequent xqc configuration uses the reserved memory to prevent hardware from accessing the released memory. Signed-off-by: Weili Qian <qianweili@huawei.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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.