libata: Ignore spurious PHY event on LPM policy change
authorGabriele Mazzotta <gabriele.mzt@gmail.com>
Sat, 25 Apr 2015 17:52:37 +0000 (19:52 +0200)
committerTejun Heo <tj@kernel.org>
Sat, 25 Apr 2015 20:50:14 +0000 (16:50 -0400)
commit09c5b4803a80a5451d950d6a539d2eb311dc0fb1
tree3c705a3de60c8c2fe76ee8dd8d13d6e8676bce10
parent8393b811f38acdf7fd8da2028708edad3e68ce1f
libata: Ignore spurious PHY event on LPM policy change

When the LPM policy is set to ATA_LPM_MAX_POWER, the device might
generate a spurious PHY event that cuases errors on the link.
Ignore this event if it occured within 10s after the policy change.

The timeout was chosen observing that on a Dell XPS13 9333 these
spurious events can occur up to roughly 6s after the policy change.

Link: http://lkml.kernel.org/g/3352987.ugV1Ipy7Z5@xps13
Signed-off-by: Gabriele Mazzotta <gabriele.mzt@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: stable@vger.kernel.org
drivers/ata/libata-core.c
drivers/ata/libata-eh.c
include/linux/libata.h