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Damien Le Moal authored
Commit 734e1a86 ("block: Prevent deadlocks when switching elevators") introduced the function elv_iosched_load_module() to allow loading an elevator module outside of elv_iosched_store() with the target device queue not frozen, to avoid deadlocks. However, the "none" scheduler does not have a module and as a result, elv_iosched_load_module() always returns an error when trying to switch to this valid scheduler. Fix this by ignoring the return value of the request_module() call done by elv_iosched_load_module(). This restores the behavior before commit 734e1a86, which was to ignore the request_module() result and instead rely on elevator_change() to handle the "none" scheduler case. Reported-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com> Fixes: 734e1a86 ("block: Prevent deadlocks when switching elevators") Cc: stable@vger.kernel.org Signed-off-by: Damien Le Moal <dlemoal@kernel.org> Reviewed-by: Christoph Hellwig <hch@lst.de> Link: https://lore.kernel.org/r/20240917133231.134806-1-dlemoal@kernel.orgSigned-off-by: Jens Axboe <axboe@kernel.dk>
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