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When injecting 2bit ecc errors, it will cause confusion inside SAS controller which needs host reset to recover it. If a device is gone at the same times inject 2bit ecc errors, we may not receive the ITCT interrupt so it will wait for completion in clear_itct_v3_hw() all the time. And host reset will also not occur because it can't require hisi_hba->sem, so the system will be suspended. To solve the issue, use wait_for_completion_timeout() instead of wait_for_completion(), and also don't mark the gone device as SAS_PHY_UNUSED when device gone. Link: https://lore.kernel.org/r/1571926105-74636-4-git-send-email-john.garry@huawei.com Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.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.