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If an error occurs when resuming a host adapter before the devices attached to the adapter are resumed, the adapter low level driver may remove the scsi host, resulting in a call to sd_remove() for the disks of the host. This in turn results in a call to sd_shutdown() which will issue a synchronize cache command and a start stop unit command to spindown the disk. sd_shutdown() issues the commands only if the device is not already runtime suspended but does not check the power state for system-wide suspend/resume. That is, the commands may be issued with the device in a suspended state, which causes PM resume to hang, forcing a reset of the machine to recover. Fix this by tracking the suspended state of a disk by introducing the suspended boolean field in the scsi_disk structure. This flag is set to true when the disk is suspended is sd_suspend_common() and resumed with sd_resume(). When suspended is true, sd_shutdown() is not executed from sd_remove(). Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Hannes Reinecke <hare@suse.de> Reviewed-by: Bart Van Assche <bvanassche@acm.org> Reviewed-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.