ata: pata_legacy: fix pdc20230_set_piomode()
authorSergey Shtylyov <s.shtylyov@omp.ru>
Fri, 28 Oct 2022 21:07:06 +0000 (00:07 +0300)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 10 Nov 2022 17:15:28 +0000 (18:15 +0100)
commitab80025ea7ac61f83932c702fa9341d2d8e85f70
tree958a5938cda0b4249d880381a76a03a42f47c58a
parentdede9ba02705e84ff5aae0ebffbad5a37ea24a54
ata: pata_legacy: fix pdc20230_set_piomode()

[ Upstream commit 171a93182eccd6e6835d2c86b40787f9f832efaa ]

Clang gives a warning when compiling pata_legacy.c with 'make W=1' about
the 'rt' local variable in pdc20230_set_piomode() being set but unused.
Quite obviously, there is an outb() call missing to write back the updated
variable. Moreover, checking the docs by Petr Soucek revealed that bitwise
AND should have been done with a negated timing mask and the master/slave
timing masks were swapped while updating...

Fixes: 669a5db411d8 ("[libata] Add a bunch of PATA drivers.")
Reported-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Sergey Shtylyov <s.shtylyov@omp.ru>
Signed-off-by: Damien Le Moal <damien.lemoal@opensource.wdc.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/ata/pata_legacy.c