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i2c: at91: Initialize dma_buf in at91_twi_xfer()

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[ Upstream commit 6977262c2eee111645668fe9e235ef2f5694abf7 ]

Clang warns:

  drivers/i2c/busses/i2c-at91-master.c:707:6: warning: variable 'dma_buf' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
          if (dev->use_dma) {
              ^~~~~~~~~~~~
  drivers/i2c/busses/i2c-at91-master.c:717:27: note: uninitialized use occurs here
          i2c_put_dma_safe_msg_buf(dma_buf, m_start, !ret);
                                   ^~~~~~~

Initialize dma_buf to NULL, as i2c_put_dma_safe_msg_buf() is a no-op
when the first argument is NULL, which will work for the !dev->use_dma
case.

Fixes: 03fbb903c8bf ("i2c: at91: use dma safe buffers")
Link: https://github.com/ClangBuiltLinux/linux/issues/1629
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Reviewed-by: Michael Walle <michael@walle.cc>
Signed-off-by: Wolfram Sang <wsa@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Nathan Chancellor 2022-05-05 08:27:38 -07:00 committed by Greg Kroah-Hartman
parent 8e49773a75
commit f57696bc63
1 changed files with 1 additions and 1 deletions
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2
drivers/i2c/busses/i2c-at91-master.c
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@ -657,7 +657,7 @@ static int at91_twi_xfer(struct i2c_adapter *adap, struct i2c_msg *msg, int num)
unsigned int_addr_flag = 0;
struct i2c_msg *m_start = msg;
bool is_read;
u8 *dma_buf;
u8 *dma_buf = NULL;
dev_dbg(&adap->dev, "at91_xfer: processing %d messages:\n", num);