Patch "powerpc/eeh: Fix deadlock when PE frozen state can't be cleared" has been added to the 4.8-stable tree

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

powerpc/eeh: Fix deadlock when PE frozen state can't be cleared

to the 4.8-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:
powerpc-eeh-fix-deadlock-when-pe-frozen-state-can-t-be-cleared.patch
and it can be found in the queue-4.8 subdirectory.

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

From: Andrew Donnellan <[email protected]>
Date: Thu, 1 Dec 2016 11:23:05 +1100
Subject: powerpc/eeh: Fix deadlock when PE frozen state can't be cleared

From: Andrew Donnellan <[email protected]>

commit 409bf7f8a02ef88db5a0f2cdcf9489914f4b8508 upstream.

In eeh_reset_device(), we take the pci_rescan_remove_lock immediately after after we call eeh_reset_pe() to reset the PCI controller. We then call eeh_clear_pe_frozen_state(), which can return an error. In this case, we bail out of eeh_reset_device() without calling pci_unlock_rescan_remove().

Add a call to pci_unlock_rescan_remove() in the eeh_clear_pe_frozen_state() error path so that we don't cause a deadlock later on.

---
 arch/powerpc/kernel/eeh_driver.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

@@ -671,8 +671,10 @@ static int eeh_reset_device(struct eeh_p
 
 	/* Clear frozen state */
 	rc = eeh_clear_pe_frozen_state(pe, false);
-	if (rc)
+	if (rc) {
+		pci_unlock_rescan_remove();
 		return rc;
+	}
 
 	/* Give the system 5 seconds to finish running the user-space
 	 * hotplug shutdown scripts, e.g. ifdown for ethernet.  Yes,

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

queue-4.8/powerpc-eeh-fix-deadlock-when-pe-frozen-state-can-t-be-cleared.patch