mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-10 21:07:02 +09:00
d523384766
This reverts commit84f7a9de06. Because it introduces a problem that rq->__data_len is set to the wrong value. before the patch: 1) nr_bytes = rq->__data_len 2) rq->__data_len = sdp->sector_size 3) scsi_init_io() 4) rq->__data_len = nr_bytes after the patch: 1) rq->__data_len = sdp->sector_size 2) scsi_init_io() 3) rq->__data_len = rq->__data_len -> __data_len is wrong It will cause that io can only complete one segment each time, and the io will requeue in scsi_io_completion_action(), which will cause severe performance degradation. Scsi write same is removed in commite383e16e84("scsi: sd: Remove WRITE_SAME support") from mainline, hence this patch is only needed for stable kernels. Fixes:84f7a9de06("scsi: sd: Remove a local variable") Signed-off-by: Yu Kuai <yukuai3@huawei.com> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.