tree 5f453b8172b9711bede3c9092d765ca91b28c06e
parent 86a3d597235d7305e3acad62fe97dc59ec2db76f
author Esben Haabendal <eha@deif.com> 1534408992 +0200
committer Greg Kroah-Hartman <gregkh@linuxfoundation.org> 1535109163 +0200

i2c: imx: Fix race condition in dma read

commit bed4ff1ed4d8f2ef5007c5c6ae1b29c5677a3632 upstream.

This fixes a race condition, where the DMAEN bit ends up being set after
I2C slave has transmitted a byte following the dummy read.  When that
happens, an interrupt is generated instead, and no DMA request is generated
to kickstart the DMA read, and a timeout happens after DMA_TIMEOUT (1 sec).

Fixed by setting the DMAEN bit before the dummy read.

Signed-off-by: Esben Haabendal <eha@deif.com>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>