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91cf42c63fWhen the size of a transfer exceeds the size of the FIFO (32 bytes), RX
overflows will be generated and receive data will be corrupted and
warnings will be produced. For example, here's an error generated by a
transfer of 36 bytes:
spi_master spi0: mchp_corespi_interrupt: RX OVERFLOW: rxlen: 4, txlen: 0
The driver is currently split between handling receiving in the
interrupt handler, and sending outside of it. Move all handling out of
the interrupt handling, and explicitly link the number of bytes read of
of the RX FIFO to the number written into the TX one. This both resolves
the overflow problems as well as simplifying the flow of the driver.
CC: stable@vger.kernel.org
Fixes:
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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.