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For SATA devices supporting NCQ, drivers using libsas first initialize a scsi device queue depth based on the controller and device capabilities, leading to the scsi device queue_depth field being 32 (ATA maximum queue depth) for most setup. However, if libata was loaded using the force=[ID]]noncq argument, the default queue depth should be set to 1 to reflect the fact that queuable commands will never be used. This is consistent with manually setting a device queue depth to 1 through sysfs as that disables NCQ use for the device. Fix ata_scsi_dev_config() to honor the noncq parameter by sertting the device queue depth to 1 for devices that do not have the ATA_DFLAG_NCQ flag set. Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> Tested-by: John Garry <john.garry@huawei.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.