Patch "[PATCH 025/135] fm10k: Cleanup exception handling for mailbox" has been added to the 4.4-stable tree

This is a note to let you know that I've just added the patch titled

[PATCH 025/135] fm10k: Cleanup exception handling for mailbox

to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
0025-fm10k-Cleanup-exception-handling-for-mailbox-interru.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Alexander Duyck <[email protected]>
Date: Tue, 27 Oct 2015 16:59:18 -0700
Subject: [PATCH 025/135] fm10k: Cleanup exception handling for mailbox
interrupt

[ Upstream commit e00e23bceba48a8f0c94fefe26948404cbd43d0a ]

This patch addresses two issues.

First is the fact that the fm10k_mbx_free_irq was assuming msix_entries was valid and that will not always be the case. As such we need to add a check for if it is NULL.

Second is the fact that we weren't freeing the IRQ if the mailbox API returned an error on trying to connect.

---
 drivers/net/ethernet/intel/fm10k/fm10k_pci.c |   13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

@@ -1122,6 +1122,10 @@ void fm10k_mbx_free_irq(struct fm10k_int
 	struct fm10k_hw *hw = &interface->hw;
 	int itr_reg;
 
+	/* no mailbox IRQ to free if MSI-X is not enabled */
+	if (!interface->msix_entries)
+		return;
+
 	/* disconnect the mailbox */
 	hw->mbx.ops.disconnect(hw, &hw->mbx);
 

@@ -1444,10 +1448,15 @@ int fm10k_mbx_request_irq(struct fm10k_i
 		err = fm10k_mbx_request_irq_pf(interface);
 	else
 		err = fm10k_mbx_request_irq_vf(interface);
+	if (err)
+		return err;
 
 	/* connect mailbox */
-	if (!err)
-		err = hw->mbx.ops.connect(hw, &hw->mbx);
+	err = hw->mbx.ops.connect(hw, &hw->mbx);
+
+	/* if the mailbox failed to connect, then free IRQ */
+	if (err)
+		fm10k_mbx_free_irq(interface);
 
 	return err;
 }

Patches currently in stable-queue which might be from [email protected] are

queue-4.4/0014-ixgbe-Fix-handling-of-NAPI-budget-when-multiple-queu.patch queue-4.4/0025-fm10k-Cleanup-exception-handling-for-mailbox-interru.patch queue-4.4/0020-fm10k-Fix-handling-of-NAPI-budget-when-multiple-queu.patch queue-4.4/0024-fm10k-Cleanup-MSI-X-interrupts-in-case-of-failure.patch