From ca6d43b051b5a061b33c43303b6b4c93b46a34b5 Mon Sep 17 00:00:00 2001 From: Dan Williams Date: Thu, 21 Jun 2012 23:41:41 -0700 Subject: [PATCH] [SCSI] libata: reset once Hotplug testing with libsas currently encounters a 55 second wait for link recovery to give up. In the case where the user trusts the response time of their devices permit the recovery attempts to be limited to one. Signed-off-by: Dan Williams Acked-by: Jeff Garzik Acked-by: Tejun Heo Signed-off-by: James Bottomley --- Documentation/kernel-parameters.txt | 3 +++ drivers/ata/libata-core.c | 1 + drivers/ata/libata-eh.c | 2 ++ include/linux/libata.h | 1 + 4 files changed, 7 insertions(+) diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt index ad7e2e5088c1..2cb2d81a51ab 100644 --- a/Documentation/kernel-parameters.txt +++ b/Documentation/kernel-parameters.txt @@ -1350,6 +1350,9 @@ bytes respectively. Such letter suffixes can also be entirely omitted. * nohrst, nosrst, norst: suppress hard, soft and both resets. + * rstonce: only attempt one reset during + hot-unplug link recovery + * dump_id: dump IDENTIFY data. If there are multiple matching configurations changing diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index fadd5866d40f..70964aabcb89 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -6387,6 +6387,7 @@ static int __init ata_parse_force_one(char **cur, { "nohrst", .lflags = ATA_LFLAG_NO_HRST }, { "nosrst", .lflags = ATA_LFLAG_NO_SRST }, { "norst", .lflags = ATA_LFLAG_NO_HRST | ATA_LFLAG_NO_SRST }, + { "rstonce", .lflags = ATA_LFLAG_RST_ONCE }, }; char *start = *cur, *p = *cur; char *id, *val, *endp; diff --git a/drivers/ata/libata-eh.c b/drivers/ata/libata-eh.c index 7d4535e989bf..100428dde421 100644 --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -2623,6 +2623,8 @@ int ata_eh_reset(struct ata_link *link, int classify, */ while (ata_eh_reset_timeouts[max_tries] != ULONG_MAX) max_tries++; + if (link->flags & ATA_LFLAG_RST_ONCE) + max_tries = 1; if (link->flags & ATA_LFLAG_NO_HRST) hardreset = NULL; if (link->flags & ATA_LFLAG_NO_SRST) diff --git a/include/linux/libata.h b/include/linux/libata.h index 64f90e17e51d..31a2853e9530 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -184,6 +184,7 @@ enum { ATA_LFLAG_DISABLED = (1 << 6), /* link is disabled */ ATA_LFLAG_SW_ACTIVITY = (1 << 7), /* keep activity stats */ ATA_LFLAG_NO_LPM = (1 << 8), /* disable LPM on this link */ + ATA_LFLAG_RST_ONCE = (1 << 9), /* limit recovery to one reset */ /* struct ata_port flags */ ATA_FLAG_SLAVE_POSS = (1 << 0), /* host supports slave dev */ -- 2.45.2