[PATCH v2025.09.y 43/58] mci: spi: initialize r1 to fix garbage return value

[Ahmad Fatoum]

If bcnt is 0, the while loop body never executes and r1 is returned
uninitialized. Initialize it to 0 (success) which is the correct
result when there are no blocks to write.

(cherry picked from commit 095bd13cf981aaceb4c0f5f7e9b14a3482c3be7e)

Reported-by: GCC 14.2 -fanalyzer
Co-Authored-By: Claude Opus 4.6 <noreply at anthropic.com>
Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
Link: https://lore.barebox.org/20260216084253.3547270-12-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 drivers/mci/mci_spi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mci/mci_spi.c b/drivers/mci/mci_spi.c
index 3ab90d768fbd..b495cdaafcf4 100644
--- a/drivers/mci/mci_spi.c
+++ b/drivers/mci/mci_spi.c
@@ -172,7 +172,7 @@ static uint mmc_spi_writedata(struct mmc_spi_host *host, const void *xbuf,
 			      uint32_t bcnt, uint32_t bsize, int multi)
 {
 	const uint8_t *buf = xbuf;
-	uint8_t r1;
+	uint8_t r1 = 0;
 	uint16_t crc = 0;
 	uint8_t tok[2];
 	int i;
-- 
2.47.3