libata: don't request sense data on !ZAC ATA devices
authorTejun Heo <tj@kernel.org>
Mon, 24 Jun 2019 16:32:50 +0000 (09:32 -0700)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 31 Jul 2019 05:28:30 +0000 (07:28 +0200)
commit85b583f12374872bd735881806aa5ece71bdb5c4
treea13f7446284cc84f942df3b7433adaba8cfd146b
parent0bb10bb2329abf3a389e6c942e935487906bb890
libata: don't request sense data on !ZAC ATA devices

[ Upstream commit ca156e006add67e4beea7896be395160735e09b0 ]

ZAC support added sense data requesting on error for both ZAC and ATA
devices. This seems to cause erratic error handling behaviors on some
SSDs where the device reports sense data availability and then
delivers the wrong content making EH take the wrong actions.  The
failure mode was sporadic on a LITE-ON ssd and couldn't be reliably
reproduced.

There is no value in requesting sense data from non-ZAC ATA devices
while there's a significant risk of introducing EH misbehaviors which
are difficult to reproduce and fix.  Let's do the sense data dancing
only for ZAC devices.

Reviewed-by: Hannes Reinecke <hare@suse.com>
Tested-by: Masato Suzuki <masato.suzuki@wdc.com>
Reviewed-by: Damien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/ata/libata-eh.c