diff options
| author | Esben Haabendal <eha@deif.com> | 2018-08-16 10:43:12 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-24 13:07:17 +0200 |
| commit | 9a63bbbf78cc9e346f563b8d17371d31fddf25c5 (patch) | |
| tree | 7c8e33b6ba917eb1c33afe4f1d93d1d8b57bead0 /lib/mpi/mpiutil.c | |
| parent | 7da4d0e8b0366b0809fa8e88689e821150d4aae0 (diff) | |
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>
Diffstat (limited to 'lib/mpi/mpiutil.c')
0 files changed, 0 insertions, 0 deletions