[PATCH AUTOSEL for 4.9 214/293] ASoC: au1x: Fix timeout tests in au1xac97c_ac97_read()

[Sasha Levin]

From: Dan Carpenter <dan.carpen...@oracle.com>

[ Upstream commit 123af9043e93cb6f235207d260d50f832cdb5439 ]

The loop timeout doesn't work because it's a post op and ends with "tmo"
set to -1.  I changed it from a post-op to a pre-op and I changed the
initial the starting value from 5 to 6 so we still iterate 5 times.  I
left the other as it was because it's a large number.

Fixes: b3c70c9ea62a ("ASoC: Alchemy AC97C/I2SC audio support")
Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Sasha Levin <alexander.le...@microsoft.com>
---
 sound/soc/au1x/ac97c.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/sound/soc/au1x/ac97c.c b/sound/soc/au1x/ac97c.c
index 29a97d52e8ad..66d6c52e7761 100644
--- a/sound/soc/au1x/ac97c.c
+++ b/sound/soc/au1x/ac97c.c
@@ -91,8 +91,8 @@ static unsigned short au1xac97c_ac97_read(struct snd_ac97 
*ac97,
        do {
                mutex_lock(&ctx->lock);
 
-               tmo = 5;
-               while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
+               tmo = 6;
+               while ((RD(ctx, AC97_STATUS) & STAT_CP) && --tmo)
                        udelay(21);     /* wait an ac97 frame time */
                if (!tmo) {
                        pr_debug("ac97rd timeout #1\n");
@@ -105,7 +105,7 @@ static unsigned short au1xac97c_ac97_read(struct snd_ac97 
*ac97,
                 * poll, Forrest, poll...
                 */
                tmo = 0x10000;
-               while ((RD(ctx, AC97_STATUS) & STAT_CP) && tmo--)
+               while ((RD(ctx, AC97_STATUS) & STAT_CP) && --tmo)
                        asm volatile ("nop");
                data = RD(ctx, AC97_CMDRESP);
 
-- 
2.15.1