When building with -Wsometimes-uninitialized, Clang warns:
drivers/scsi/qla4xxx/ql4_os.c:5915:7: warning: variable 'buf_dma' is
used uninitialized whenever 'if' condition is false
[-Wsometimes-uninitialized]
Don't call dma_free_coherent when buf is NULL, meaning that we never
called dma_alloc_coherent and initialized buf_dma.
Fixes: 2a991c215978 ("[SCSI] qla4xxx: Boot from SAN support for open-iscsi")
Link: https://github.com/ClangBuiltLinux/linux/issues/391
Signed-off-by: Nathan Chancellor <natechancellor@xxxxxxxxx>
---
v1 -> v2:
* Check that buf is not NULL, which matches how dma_free_coherent is
called in the rest of the tree. This still fixes the warning.
drivers/scsi/qla4xxx/ql4_os.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/qla4xxx/ql4_os.c b/drivers/scsi/qla4xxx/ql4_os.c
index 16a18d5d856f..9f56dafc3cda 100644
--- a/drivers/scsi/qla4xxx/ql4_os.c
+++ b/drivers/scsi/qla4xxx/ql4_os.c
@@ -5982,7 +5982,8 @@ static int get_fw_boot_info(struct scsi_qla_host *ha, uint16_t ddb_index[])
ddb_index[1]));
exit_boot_info_free:
- dma_free_coherent(&ha->pdev->dev, size, buf, buf_dma);
+ if (buf)
+ dma_free_coherent(&ha->pdev->dev, size, buf, buf_dma);
exit_boot_info:
ha->pri_ddb_idx = ddb_index[0];
ha->sec_ddb_idx = ddb_index[1];
--
2.21.0
