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scsi: gdth: Only call dma_free_coherent when buf is not NULL in ioc_general 

When building with -Wsometimes-uninitialized, Clang warns:

drivers/scsi/gdth.c:3662:6: warning: variable 'paddr' is used
uninitialized whenever 'if' condition is false
[-Wsometimes-uninitialized]

Don't attempt to call dma_free_coherent when buf is NULL (meaning that
we never called dma_alloc_coherent and initialized paddr), which avoids
this warning.

Link: https://github.com/ClangBuiltLinux/linux/issues/402
Signed-off-by: Nathan Chancellor <natechancellor@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Nathan Chancellor 2019-03-07 16:18:39 -07:00 committed by Martin K. Petersen
parent a4b207dea9
commit 3e14592da6
1 changed files with 3 additions and 2 deletions
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5
drivers/scsi/gdth.c
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@ -3697,8 +3697,9 @@ static int ioc_general(void __user *arg, char *cmnd)
rval = 0;
out_free_buf:
dma_free_coherent(&ha->pdev->dev, gen.data_len + gen.sense_len, buf,
paddr);
if (buf)
dma_free_coherent(&ha->pdev->dev, gen.data_len + gen.sense_len,
buf, paddr);
return rval;
}