can: tcan4x5x: tcan4x5x_init(): fix initialization - clear MRAM before entering Norma...

commit 2712625200ed69c642b9abc3a403830c4643364c upstream.

This patch prevents a potentially destructive race condition. The
device is fully operational on the bus after entering Normal Mode, so
zeroing the MRAM after entering this mode may lead to loss of
information, e.g. new received messages.

This patch fixes the problem by first initializing the MRAM, then
bringing the device into Normale Mode.

Fixes: 5443c226ba91 ("can: tcan4x5x: Add tcan4x5x driver to the kernel")
Link: https://lore.kernel.org/r/20210226163440.313628-1-torin@maxiluxsystems.com
Suggested-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Torin Cooper-Bennun <torin@maxiluxsystems.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/net/can/m_can/tcan4x5x.c b/drivers/net/can/m_can/tcan4x5x.c
index f726c51..01f5b6e 100644 (file)
--- a/drivers/net/can/m_can/tcan4x5x.c
+++ b/drivers/net/can/m_can/tcan4x5x.c
@@ -328,14 +328,14 @@ static int tcan4x5x_init(struct m_can_classdev *cdev)
        if (ret)
                return ret;
 
+       /* Zero out the MCAN buffers */
+       m_can_init_ram(cdev);
+
        ret = regmap_update_bits(tcan4x5x->regmap, TCAN4X5X_CONFIG,
                                 TCAN4X5X_MODE_SEL_MASK, TCAN4X5X_MODE_NORMAL);
        if (ret)
                return ret;
 
-       /* Zero out the MCAN buffers */
-       m_can_init_ram(cdev);
-
        return ret;
 }