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In clear_luns_changed_on_target(), we iter all devices for all shosts to conditionally clear the SDEBUG_UA_LUNS_CHANGED flag in the per-device uas_bm. One condition to see whether we clear the flag is to test whether the host for the device under consideration is the same as the matching device's (devip) host. This check will only ever pass for devices for the same shost, so only iter the devices for the matching device shost. We can now drop the spinlock'ing of the sdebug_host_list_lock in the same function. This will allow us to use a mutex instead of the spinlock for the global shost lock, as clear_luns_changed_on_target() could be called in non-blocking context, in scsi_debug_queuecommand() -> make_ua() -> clear_luns_changed_on_target() (which is why required a spinlock). Signed-off-by: John Garry <john.g.garry@oracle.com> Link: https://lore.kernel.org/r/20230327074310.1862889-3-john.g.garry@oracle.com Acked-by: Douglas Gilbert <dgilbert@interlog.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.