scsi-generic: Handle queue full
The sg driver currently has a hardcoded limit of commands it can handle simultaneously. When this limit is reached the driver will return -EDOM. So we need to capture this to enable proper return values here. Signed-off-by: NHannes Reinecke <hare@suse.de> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NChristoph Hellwig <hch@lst.de>
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