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pm80xx: Fix for Incorrect DMA Unmapping of SG List 

In pm8001_ccb_task_free(), the dma unmapping is done based on
ccb->n_elem value. This should be initialized to zero in the
task_abort(). Otherwise, pm8001_ccb_task_free() will try for
dma_unmap_sg() which is invalid for task abort and can lead to
kernel crash.

Changes From V1:
None

Signed-off-by: Viswas G <Viswas.G@pmcs.com>

Reviewed-by: Suresh Thiagarajan <Suresh.Thiagarajan@pmcs.com>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Reviewed-by: Jack Wang <jinpu.wang@profitbricks.com>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Odin.com>
This commit is contained in:
Viswas G 2015-08-11 15:06:28 +05:30 committed by James Bottomley
parent 842784e0d1
commit 3b700e3411
1 changed files with 1 additions and 0 deletions
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1
drivers/scsi/pm8001/pm8001_sas.c
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@ -790,6 +790,7 @@ pm8001_exec_internal_task_abort(struct pm8001_hba_info *pm8001_ha,
ccb->device = pm8001_dev;
ccb->ccb_tag = ccb_tag;
ccb->task = task;
ccb->n_elem = 0;
res = PM8001_CHIP_DISP->task_abort(pm8001_ha,
pm8001_dev, flag, task_tag, ccb_tag);