From 75aa3209c945fc711163ff1ecbc031bd13962a9d Mon Sep 17 00:00:00 2001 From: Douglas Gilbert Date: Thu, 12 Jul 2018 13:35:42 -0400 Subject: [PATCH] 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 Signed-off-by: Martin K. Petersen --- drivers/scsi/scsi_debug.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c index 24d7496cd9e2..4dda192b8fba 100644 --- a/drivers/scsi/scsi_debug.c +++ b/drivers/scsi/scsi_debug.c @@ -5790,11 +5790,13 @@ static int scsi_debug_queuecommand(struct Scsi_Host *shost, fini: if (F_DELAY_OVERR & flags) return schedule_resp(scp, devip, errsts, pfp, 0, 0); - else if ((sdebug_jdelay || sdebug_ndelay) && (flags & F_LONG_DELAY)) { + else if ((flags & F_LONG_DELAY) && (sdebug_jdelay > 0 || + sdebug_ndelay > 10000)) { /* - * If any delay is active, for F_SSU_DELAY want at least 1 - * second and if sdebug_jdelay>0 want a long delay of that - * many seconds; for F_SYNC_DELAY want 1/20 of that. + * Skip long delays if ndelay <= 10 microseconds. Otherwise + * for Start Stop Unit (SSU) want at least 1 second delay and + * if sdebug_jdelay>1 want a long delay of that many seconds. + * For Synchronize Cache want 1/20 of SSU's delay. */ int jdelay = (sdebug_jdelay < 2) ? 1 : sdebug_jdelay; int denom = (flags & F_SYNC_DELAY) ? 20 : 1; -- 2.11.0