diff mbox

[dpdk-dev,v5,06/29] i40e/base: fix missing check for stopped admin queue

Message ID 1457424877-26234-7-git-send-email-helin.zhang@intel.com (mailing list archive)
State Accepted, archived
Delegated to: Bruce Richardson
Headers show

Commit Message

Helin Zhang March 8, 2016, 8:14 a.m. UTC
It's possible that while waiting for the spinlock, another
entity (that owns the spinlock) has shut down the admin queue.
If it then attempts to use the queue, it will panic.
It adds a check for this condition on the receive side. This
matches an existing check on the send queue side.

Fixes: 8db9e2a1b232 ("i40e: base driver")

Signed-off-by: Helin Zhang <helin.zhang@intel.com>
Acked-by: Jingjing Wu <jingjing.wu@intel.com>
---
 drivers/net/i40e/base/i40e_adminq.c | 8 ++++++++
 1 file changed, 8 insertions(+)

v4:
 - Reworded the commit logs.
diff mbox

Patch

diff --git a/drivers/net/i40e/base/i40e_adminq.c b/drivers/net/i40e/base/i40e_adminq.c
index 998582c..e1a162e 100644
--- a/drivers/net/i40e/base/i40e_adminq.c
+++ b/drivers/net/i40e/base/i40e_adminq.c
@@ -1035,6 +1035,13 @@  enum i40e_status_code i40e_clean_arq_element(struct i40e_hw *hw,
 	/* take the lock before we start messing with the ring */
 	i40e_acquire_spinlock(&hw->aq.arq_spinlock);
 
+	if (hw->aq.arq.count == 0) {
+		i40e_debug(hw, I40E_DEBUG_AQ_MESSAGE,
+			   "AQRX: Admin queue not initialized.\n");
+		ret_code = I40E_ERR_QUEUE_EMPTY;
+		goto clean_arq_element_err;
+	}
+
 	/* set next_to_use to head */
 #ifdef PF_DRIVER
 #ifdef INTEGRATED_VF
@@ -1113,6 +1120,7 @@  clean_arq_element_out:
 	/* Set pending if needed, unlock and return */
 	if (pending != NULL)
 		*pending = (ntc > ntu ? hw->aq.arq.count : 0) + (ntu - ntc);
+clean_arq_element_err:
 	i40e_release_spinlock(&hw->aq.arq_spinlock);
 
 #ifdef PF_DRIVER