[PATCH] ASoC: stm32: spdifrx: fix synchronization state check

[Avi Weiss <thnkslprpt@gmail.com>]

The interrupt handler uses a logical AND to check whether SPDIFRX
was in the SYNC state before clearing errors. Since both SYNC (1)
and ENABLE (3) are nonzero, this also treats ENABLE as SYNC (and
any other non-zero value that might be added).

The logical && basically just converts this to check for != 0.

So errors occurring while SPDIFRX is enabled cause the driver
to retry synch instead of disconnecting the PCM stream.

Fix is to change the logical && to equality (==) and only retry
when exactly in sync state.

Fixes: 0c93c291321f2 ("ASoC: stm32: spdifrx: retry synchronization in sync state")
Signed-off-by: Avi Weiss <thnkslprpt@gmail.com>
---
 sound/soc/stm/stm32_spdifrx.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sound/soc/stm/stm32_spdifrx.c b/sound/soc/stm/stm32_spdifrx.c
index 0ece547407739..88863dbd05d9b 100644
--- a/sound/soc/stm/stm32_spdifrx.c
+++ b/sound/soc/stm/stm32_spdifrx.c
@@ -720,7 +720,7 @@ static irqreturn_t stm32_spdifrx_isr(int irq, void *devid)
 
 	if (err) {
 		regmap_read(spdifrx->regmap, STM32_SPDIFRX_CR, &cr);
-		sync_state = FIELD_GET(SPDIFRX_CR_SPDIFEN_MASK, cr) &&
+		sync_state = FIELD_GET(SPDIFRX_CR_SPDIFEN_MASK, cr) ==
 			     SPDIFRX_SPDIFEN_SYNC;
 
 		/* SPDIFRX is in STATE_STOP. Disable SPDIFRX to clear errors */

base-commit: 611680f6050a66b84e5cc0af33862a83d1f7a200
-- 
2.43.0