wifi: libertas: handle possible spu_write_u16() errors

Check and handle (well, report at least, as it's done through the rest
of the module) possible 'spu_write_u16()' errors in 'if_spi_e2h()'.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Dmitry Antipov <dmantipov@yandex.ru>
Signed-off-by: Kalle Valo <kvalo@kernel.org>
Link: https://lore.kernel.org/r/20230725060531.72968-5-dmantipov@yandex.ru

diff --git a/drivers/net/wireless/marvell/libertas/if_spi.c b/drivers/net/wireless/marvell/libertas/if_spi.c
index 3d53e44..8690b01 100644 (file)
--- a/drivers/net/wireless/marvell/libertas/if_spi.c
+++ b/drivers/net/wireless/marvell/libertas/if_spi.c
@@ -826,11 +826,16 @@ static void if_spi_e2h(struct if_spi_card *card)
                goto out;
 
        /* re-enable the card event interrupt */
-       spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG,
-                       ~IF_SPI_HICU_CARD_EVENT);
+       err = spu_write_u16(card, IF_SPI_HOST_INT_STATUS_REG,
+                           ~IF_SPI_HICU_CARD_EVENT);
+       if (err)
+               goto out;
 
        /* generate a card interrupt */
-       spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG, IF_SPI_CIC_HOST_EVENT);
+       err = spu_write_u16(card, IF_SPI_CARD_INT_CAUSE_REG,
+                           IF_SPI_CIC_HOST_EVENT);
+       if (err)
+               goto out;
 
        lbs_queue_event(priv, cause & 0xff);
 out: