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enic: reset fetch index 

Since we are allowing rx ring size modification, reset fetch index
everytime. Otherwise it could have a stale value that can lead to a null
pointer dereference.

Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: Parvi Kaustubhi <pkaustub@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Parvi Kaustubhi 2017-11-01 08:44:46 -07:00 committed by David S. Miller
parent 59c1cecce3
commit e6cdfcc581
1 changed files with 2 additions and 14 deletions
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16
drivers/net/ethernet/cisco/enic/vnic_rq.c
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@ -139,20 +139,8 @@ void vnic_rq_init(struct vnic_rq *rq, unsigned int cq_index,
unsigned int error_interrupt_enable,
unsigned int error_interrupt_offset)
{
u32 fetch_index = 0;
/* Use current fetch_index as the ring starting point */
fetch_index = ioread32(&rq->ctrl->fetch_index);
if (fetch_index == 0xFFFFFFFF) { /* check for hardware gone */
/* Hardware surprise removal: reset fetch_index */
fetch_index = 0;
}
vnic_rq_init_start(rq, cq_index,
fetch_index, fetch_index,
error_interrupt_enable,
error_interrupt_offset);
vnic_rq_init_start(rq, cq_index, 0, 0, error_interrupt_enable,
error_interrupt_offset);
}
unsigned int vnic_rq_error_status(struct vnic_rq *rq)