[SCSI] libsas: introduce scmd_dbg() to quiet false positive "timeout" messages
libsas sometimes short circuits timeouts to force commands into error recovery. It is misleading to log that the command timed-out in sas_scsi_timed_out() when in fact it was just queued for error handling. It's also redundant in the case of a true timeout as libata eh will detect and report timeouts via it's AC_ERR_TIMEOUT facility. Given that some environments consider "timeout" errors to be indicative of impending device failure demote the sas_scsi_timed_out() timeout message to be disabled by default. This parallels ata_scsi_timed_out(). [jejb: checkpatch fix] Reported-by: Xun Ni <xun.ni@intel.com> Tested-by: Nelson Cheng <nelson.cheng@intel.com> Acked-by: Lukasz Dorau <lukasz.dorau@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
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