Patch "igb: do not re-init SR-IOV during probe" has been added to the 4.2-stable tree

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

igb: do not re-init SR-IOV during probe

to the 4.2-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:
igb-do-not-re-init-sr-iov-during-probe.patch
and it can be found in the queue-4.2 subdirectory.

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

From: Stefan Assmann <[email protected]>
Date: Fri, 10 Jul 2015 15:01:12 +0200
Subject: igb: do not re-init SR-IOV during probe

From: Stefan Assmann <[email protected]>

commit 6423fc34160939142d72ffeaa2db6408317f54df upstream.

During driver probing the following code path is triggered. igb_probe
->igb_sw_init
->igb_probe_vfs

    ->igb_pci_enable_sriov
      ->igb_sriov_reinit

Doing the SR-IOV re-init is not necessary during probing since we're starting from scratch. Here we can call igb_enable_sriov() right away.

Running igb_sriov_reinit() during igb_probe() also seems to cause occasional packet loss on some onboard 82576 NICs. Reproduced on Dell and HP servers with onboard 82576 NICs.
Example:
Intel Corporation 82576 Gigabit Network Connection [8086:10c9] (rev 01)
Subsystem: Dell Device [1028:0481]

---
 drivers/net/ethernet/intel/igb/igb_main.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

@@ -2851,7 +2851,7 @@ static void igb_probe_vfs(struct igb_ada
 		return;
 
 	pci_sriov_set_totalvfs(pdev, 7);
-	igb_pci_enable_sriov(pdev, max_vfs);
+	igb_enable_sriov(pdev, max_vfs);
 
 #endif /* CONFIG_PCI_IOV */
 }

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

queue-4.2/igb-do-not-re-init-sr-iov-during-probe.patch