diff mbox

[12/18] libata: reset once

Message ID 20120506181858.17912.80568.stgit@dwillia2-linux.jf.intel.com
State Not Applicable
Delegated to: David Miller
Headers show

Commit Message

Dan Williams May 6, 2012, 6:18 p.m. UTC 
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 <dan.j.williams@intel.com>
---
 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(+)


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diff mbox

Patch

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c1601e5..9dbcc16 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1319,6 +1319,9 @@  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 bd79c8b..171597f 100644
--- a/drivers/ata/libata-core.c
+++ b/drivers/ata/libata-core.c
@@ -6381,6 +6381,7 @@  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 4f12f63..b02748b 100644
--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -2605,6 +2605,8 @@  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 a868bbc..0a3c99a 100644
--- a/include/linux/libata.h
+++ b/include/linux/libata.h
@@ -182,6 +182,7 @@  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 */