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If a new wb commit is too close to the timing of wb dma complete, clearing the wb intr status will lose the wb dma complete status. In this case, the software process is as follows: vop_wb_commit() -> vop_wb_irqs_enable() -> Clear wb intr -> vop_isr() -> vop_read_and_clear_wb_irqs() Since we had cleared the intr in vop_wb_irqs_enable(), the value read by vop_read_and_clear_wb_irqs() is 0, and we have lost the interrupt status. Change-Id: Ida08e94ce1d987f7edbcb6448c0b3f034add1bce Signed-off-by: Chaoyi Chen <chaoyi.chen@rock-chips.com>
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.