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Subject[08/78] libata: fix hotplug for drivers which dont implement LPM
2.6.38-stable review patch.  If anyone has any objections, please let us know.


From: Tejun Heo <>

commit eb0e85e36b971ec31610eda7e3ff5c11c1c44785 upstream.

ata_eh_analyze_serror() suppresses hotplug notifications if LPM is
being used because LPM generates spurious hotplug events. It compared
whether link->lpm_policy was different from ATA_LPM_MAX_POWER to
determine whether LPM is enabled; however, this is incorrect as for
drivers which don't implement LPM, lpm_policy is always
ATA_LPM_UNKNOWN. This disabled hotplug detection for all drivers
which don't implement LPM.

Fix it by comparing whether lpm_policy is greater than

Signed-off-by: Tejun Heo <>
Signed-off-by: Jeff Garzik <>
Signed-off-by: Greg Kroah-Hartman <>

drivers/ata/libata-eh.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/ata/libata-eh.c
+++ b/drivers/ata/libata-eh.c
@@ -1618,7 +1618,7 @@ static void ata_eh_analyze_serror(struct
* host links. For disabled PMP links, only N bit is
* considered as X bit is left at 1 for link plugging.
- if (link->lpm_policy != ATA_LPM_MAX_POWER)
+ if (link->lpm_policy > ATA_LPM_MAX_POWER)
hotplug_mask = 0; /* hotplug doesn't work w/ LPM */
else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link))

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