scsi_debug: give unit attention and other errors precedence over TSF
Give existing errors priority over the generation of Task Set Full (TSF) errors. So that max_queue is not exceeded, existing errors may be sent back in the invocation thread. This is done so errors like Unit Attentions are not hidden and lost by either max_queue exceeded or real/injected TSFs. Signed-off-by: NDouglas Gilbert <dgilbert@interlog.com> Reviewed-by: NMartin K. Petersen <martin.petersen@oracle.com> Signed-off-by: NChristoph Hellwig <hch@lst.de>
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