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ata_read_log_page() first tries to read the log using READ LOG DMA EXT. If that fails it will instead try to read the log using READ LOG EXT. ata_exec_internal_sg() is synchronous, so it will wait for the command to finish. If we actually got an error back from the device, it is correct to retry. However, if the command timed out, ata_exec_internal_sg() will freeze the port. There is no point in retrying if the port is frozen, as ata_exec_internal_sg() will return AC_ERR_SYSTEM on a frozen port, without ever sending the command down to the drive. Therefore, avoid retrying if the first command froze the port, as that will result in a misleading AC_ERR_SYSTEM error print, instead of printing the error that actually caused the port to be frozen (AC_ERR_TIMEOUT). Signed-off-by: Niklas Cassel <niklas.cassel@wdc.com> Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.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.