From 171a93182eccd6e6835d2c86b40787f9f832efaa Mon Sep 17 00:00:00 2001
From: Sergey Shtylyov <s.shtylyov@omp.ru>
Date: Sat, 29 Oct 2022 00:07:06 +0300
Subject: [PATCH] ata: pata_legacy: fix pdc20230_set_piomode()
Git-commit: 171a93182eccd6e6835d2c86b40787f9f832efaa
Patch-mainline: v6.1-rc4
References: git-fixes
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>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/ata/pata_legacy.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/ata/pata_legacy.c b/drivers/ata/pata_legacy.c
index 0a8bf09a5c19..03c580625c2c 100644
--- a/drivers/ata/pata_legacy.c
+++ b/drivers/ata/pata_legacy.c
@@ -315,9 +315,10 @@ static void pdc20230_set_piomode(struct ata_port *ap, struct ata_device *adev)
outb(inb(0x1F4) & 0x07, 0x1F4);
rt = inb(0x1F3);
- rt &= 0x07 << (3 * adev->devno);
+ rt &= ~(0x07 << (3 * !adev->devno));
if (pio)
- rt |= (1 + 3 * pio) << (3 * adev->devno);
+ rt |= (1 + 3 * pio) << (3 * !adev->devno);
+ outb(rt, 0x1F3);
udelay(100);
outb(inb(0x1F2) | 0x01, 0x1F2);
--
2.35.3