4 files changed, 7 insertions, 0 deletions

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 */