i2c: at91: use dma safe buffers
[ Upstream commit 03fbb903c8bf7e53e101e8d9a7b261264317c411 ]
The supplied buffer might be on the stack and we get the following error
message:
[ 3.312058] at91_i2c e0070600.i2c: rejecting DMA map of vmalloc memory
Use i2c_{get,put}_dma_safe_msg_buf() to get a DMA-able memory region if
necessary.
Fixes: 60937b2cdb
("i2c: at91: add dma support")
Signed-off-by: Michael Walle <michael@walle.cc>
Reviewed-by: Codrin Ciubotariu <codrin.ciubotariu@microchip.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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parent
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@ -609,6 +609,7 @@ static int at91_twi_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num)
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unsigned int_addr_flag = 0;
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struct i2c_msg *m_start = msg;
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bool is_read;
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u8 *dma_buf;
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dev_dbg(&adap->dev, "at91_xfer: processing %d messages:\n", num);
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@ -656,7 +657,17 @@ static int at91_twi_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num)
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dev->msg = m_start;
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dev->recv_len_abort = false;
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if (dev->use_dma) {
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dma_buf = i2c_get_dma_safe_msg_buf(m_start, 1);
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if (!dma_buf) {
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ret = -ENOMEM;
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goto out;
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}
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dev->buf = dma_buf;
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}
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ret = at91_do_twi_transfer(dev);
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i2c_put_dma_safe_msg_buf(dma_buf, m_start, !ret);
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ret = (ret < 0) ? ret : num;
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out:
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