[PATCH 4/8] pm80xx: Fix for Incorrect DMA Unmapping of SG List

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From: Viswas G <Viswas.G@xxxxxxxx>

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.

Signed-off-by: Viswas G <Viswas.G@xxxxxxxx>
Signed-off-by: Suresh Thiagarajan <Suresh.Thiagarajan@xxxxxxxx> 
---
 drivers/scsi/pm8001/pm8001_sas.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index 4e6955f..b1c5fb9 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -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);
-- 
1.7.1

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