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i2c: rcar: skip DMA if buffer is not safe

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This HW is prone to races, so it needs to setup new messages in irq
context. That means we can't alloc bounce buffers if a message buffer is
not DMA safe. So, in that case, simply fall back to PIO.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Wolfram Sang 2017-11-04 21:20:09 +01:00 committed by Wolfram Sang
parent fe23aa9a16
commit adbd77b589
1 changed files with 1 additions and 1 deletions
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drivers/i2c/busses/i2c-rcar.c
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@ -359,7 +359,7 @@ static void rcar_i2c_dma(struct rcar_i2c_priv *priv)
int len;
/* Do not use DMA if it's not available or for messages < 8 bytes */
if (IS_ERR(chan) || msg->len < 8)
if (IS_ERR(chan) || msg->len < 8 || !(msg->flags & I2C_M_DMA_SAFE))
return;
if (read) {