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[SCSI] qla2xxx: Free DMA memory only if it is allocated in vendor specific BSG command 

The qla84xx_mgmt_cmd function supports multiple subcommands.
Some subcommands require DMA memory and some do not.
Therefore check before freeing DMA memory whether it is allocated or not.

Signed-off-by: Harish Zunjarrao <harish.zunjarrao@qlogic.com>
Signed-off-by: Giridhar Malavali <giridhar.malavali@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Harish Zunjarrao 2010-03-19 17:04:00 -07:00 committed by James Bottomley
parent 09ff701a17
commit d5459083af
1 changed files with 4 additions and 2 deletions
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6
drivers/scsi/qla2xxx/qla_bsg.c
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@ -804,7 +804,7 @@ qla84xx_mgmt_cmd(struct fc_bsg_job *bsg_job)
int rval = 0;
struct qla_bsg_a84_mgmt *ql84_mgmt;
uint32_t sg_cnt;
uint32_t data_len;
uint32_t data_len = 0;
uint32_t dma_direction = DMA_NONE;
if (test_bit(ISP_ABORT_NEEDED, &vha->dpc_flags) ||
@ -980,9 +980,11 @@ qla84xx_mgmt_cmd(struct fc_bsg_job *bsg_job)
}
bsg_job->job_done(bsg_job);
dma_free_coherent(&ha->pdev->dev, data_len, mgmt_b, mgmt_dma);
done_unmap_sg:
if (mgmt_b)
dma_free_coherent(&ha->pdev->dev, data_len, mgmt_b, mgmt_dma);
if (dma_direction == DMA_TO_DEVICE)
dma_unmap_sg(&ha->pdev->dev, bsg_job->request_payload.sg_list,
bsg_job->request_payload.sg_cnt, DMA_TO_DEVICE);