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scsi: hisi_sas: Fix to only call scsi_get_prot_op() for non-NULL scsi_cmnd

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A NULL-pointer dereference was introduced for TMF SSP commands from the
upstreaming reworking.

Fix this by relocating the scsi_get_prot_op() callsite.

Fixes: d6a9000b81 ("scsi: hisi_sas: Add support for DIF feature for v2 hw")
Signed-off-by: John Garry <john.garry@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
John Garry 2019-01-25 22:22:38 +08:00 committed by Martin K. Petersen
parent 26889e5ec8
commit e1ba0b0b44
1 changed files with 2 additions and 1 deletions
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3
drivers/scsi/hisi_sas/hisi_sas_v3_hw.c
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@ -1035,8 +1035,8 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
struct sas_ssp_task *ssp_task = &task->ssp_task;
struct scsi_cmnd *scsi_cmnd = ssp_task->cmd;
struct hisi_sas_tmf_task *tmf = slot->tmf;
unsigned char prot_op = scsi_get_prot_op(scsi_cmnd);
int has_data = 0, priority = !!tmf;
unsigned char prot_op;
u8 *buf_cmd;
u32 dw1 = 0, dw2 = 0, len = 0;
@ -1051,6 +1051,7 @@ static void prep_ssp_v3_hw(struct hisi_hba *hisi_hba,
dw1 |= 2 << CMD_HDR_FRAME_TYPE_OFF;
dw1 |= DIR_NO_DATA << CMD_HDR_DIR_OFF;
} else {
prot_op = scsi_get_prot_op(scsi_cmnd);
dw1 |= 1 << CMD_HDR_FRAME_TYPE_OFF;
switch (scsi_cmnd->sc_data_direction) {
case DMA_TO_DEVICE: