cnic: Check device state before reading the kcq pointer in IRQ

If the device is down, the kcq pointer may be NULL.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 5 deletions

diff --git a/drivers/net/cnic.c b/drivers/net/cnic.c
index bf4a804e4787..1240deaf2420 100644
--- a/drivers/net/cnic.c
+++ b/drivers/net/cnic.c
@@ -2352,11 +2352,12 @@ static u32 cnic_service_bnx2_queues(struct cnic_dev *dev)
 static int cnic_service_bnx2(void *data, void *status_blk)
 {
         struct cnic_dev *dev = data;
-        struct cnic_local *cp = dev->cnic_priv;
-        u32 status_idx = *cp->kcq1.status_idx_ptr;
 
-        if (unlikely(!test_bit(CNIC_F_CNIC_UP, &dev->flags)))
-                return status_idx;
+        if (unlikely(!test_bit(CNIC_F_CNIC_UP, &dev->flags))) {
+                struct status_block *sblk = status_blk;
+
+                return sblk->status_idx;
+        }
 
         return cnic_service_bnx2_queues(dev);
 }
@@ -2375,9 +2376,10 @@ static void cnic_service_bnx2_msix(unsigned long data)
 static void cnic_doirq(struct cnic_dev *dev)
 {
         struct cnic_local *cp = dev->cnic_priv;
-        u16 prod = cp->kcq1.sw_prod_idx & MAX_KCQ_IDX;
 
         if (likely(test_bit(CNIC_F_CNIC_UP, &dev->flags))) {
+                u16 prod = cp->kcq1.sw_prod_idx & MAX_KCQ_IDX;
+
                 prefetch(cp->status_blk.gen);
                 prefetch(&cp->kcq1.kcq[KCQ_PG(prod)][KCQ_IDX(prod)]);