[PATCH] i2c: at91: Initialize dma_buf in at91_twi_xfer()

[Wolfram Sang]

On Thu, May 05, 2022 at 08:27:38AM -0700, Nathan Chancellor wrote:
> 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 at kernel.org>

Applied to for-next, thanks!

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