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scsi: scsi_debug: skip long delays when ndelay small
A test program's runtime became impractically long since any non zero ndelay (e.g. 1 nanosec) caused Start Stop Unit to delay over 8 magnitudes greater than other commands. This patch skips long delays (on Start Stop Unit and Synchronize Cache) if ndelay is less than or equal to 10 microsecs. Signed-off-by: Douglas Gilbert <dgilbert@interlog.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -5790,11 +5790,13 @@ static int scsi_debug_queuecommand(struct Scsi_Host *shost,
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fini:
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if (F_DELAY_OVERR & flags)
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return schedule_resp(scp, devip, errsts, pfp, 0, 0);
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else if ((sdebug_jdelay || sdebug_ndelay) && (flags & F_LONG_DELAY)) {
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else if ((flags & F_LONG_DELAY) && (sdebug_jdelay > 0 ||
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sdebug_ndelay > 10000)) {
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/*
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* If any delay is active, for F_SSU_DELAY want at least 1
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* second and if sdebug_jdelay>0 want a long delay of that
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* many seconds; for F_SYNC_DELAY want 1/20 of that.
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* Skip long delays if ndelay <= 10 microseconds. Otherwise
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* for Start Stop Unit (SSU) want at least 1 second delay and
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* if sdebug_jdelay>1 want a long delay of that many seconds.
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* For Synchronize Cache want 1/20 of SSU's delay.
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*/
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int jdelay = (sdebug_jdelay < 2) ? 1 : sdebug_jdelay;
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int denom = (flags & F_SYNC_DELAY) ? 20 : 1;
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