Revert "usb: storage: Add quirk for Samsung Fit flash"
authorsunghwan jung <onenowy@gmail.com>
Tue, 13 Sep 2022 11:49:13 +0000 (20:49 +0900)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 26 Oct 2022 11:25:54 +0000 (13:25 +0200)
commit3a5a34ed9d68ffb008a60946ac1619b40a111716
tree032dfccedf6f25399037290ea8237a69f7d8358b
parentacf0006f2b2b2ca672988875fd154429aafb2a9b
Revert "usb: storage: Add quirk for Samsung Fit flash"

[ Upstream commit ad5dbfc123e6ffbbde194e2a4603323e09f741ee ]

This reverts commit 86d92f5465958752481269348d474414dccb1552,
which fix the timeout issue for "Samsung Fit Flash".

But the commit affects not only "Samsung Fit Flash" but also other usb
storages that use the same controller and causes severe performance
regression.

 # hdparm -t /dev/sda (without the quirk)
 Timing buffered disk reads: 622 MB in  3.01 seconds = 206.66 MB/sec

 # hdparm -t /dev/sda (with the quirk)
 Timing buffered disk reads: 220 MB in  3.00 seconds =  73.32 MB/sec

The commit author mentioned that "Issue was reproduced after device has
bad block", so this quirk should be applied when we have the timeout
issue with a device that has bad blocks.

We revert the commit so that we apply this quirk by adding kernel
paramters using a bootloader or other ways when we really need it,
without the performance regression with devices that don't have the
issue.

Signed-off-by: sunghwan jung <onenowy@gmail.com>
Link: https://lore.kernel.org/r/20220913114913.3073-1-onenowy@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/usb/storage/unusual_devs.h