From d5459083af5b6e01796797edd12555ab586c6092 Mon Sep 17 00:00:00 2001 From: Harish Zunjarrao Date: Fri, 19 Mar 2010 17:04:00 -0700 Subject: [PATCH] [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 Signed-off-by: Giridhar Malavali Signed-off-by: James Bottomley --- drivers/scsi/qla2xxx/qla_bsg.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/scsi/qla2xxx/qla_bsg.c b/drivers/scsi/qla2xxx/qla_bsg.c index 3c3a86ca6cbd..584c52d134fa 100644 --- a/drivers/scsi/qla2xxx/qla_bsg.c +++ b/drivers/scsi/qla2xxx/qla_bsg.c @@ -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);