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can: flexcan: Unlock the MB unconditionally

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Unlock the MB irrespective of reception method being FIFO or timestamp
based. It is optional but recommended to unlock Mailbox as soon as
possible and make it available for reception.

Reported-by: Alexander Stein <alexander.stein@systec-electronic.com>
Signed-off-by: Pankaj Bansal <pankaj.bansal@nxp.com>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Pankaj Bansal 2018-08-01 19:36:46 +05:30 committed by Marc Kleine-Budde
parent f164d0204b
commit 5178b7cd8e
1 changed files with 6 additions and 1 deletions
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7
drivers/net/can/flexcan.c
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@ -720,9 +720,14 @@ static unsigned int flexcan_mailbox_read(struct can_rx_offload *offload,
priv->write(BIT(n - 32), &regs->iflag2); priv->write(BIT(n - 32), &regs->iflag2);
} else { } else {
priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, &regs->iflag1); priv->write(FLEXCAN_IFLAG_RX_FIFO_AVAILABLE, &regs->iflag1);
priv->read(&regs->timer);
} }
/* Read the Free Running Timer. It is optional but recommended
* to unlock Mailbox as soon as possible and make it available
* for reception.
*/
priv->read(&regs->timer);
return 1; return 1;
} }