Patch "powerpc/eeh: Don't report error in eeh_pe_reset_and_recover()" has been added to the 4.4-stable tree

[<gregkh@linuxfoundation.org>]

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

    powerpc/eeh: Don't report error in eeh_pe_reset_and_recover()

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:
     powerpc-eeh-don-t-report-error-in-eeh_pe_reset_and_recover.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 <stable@vger.kernel.org> know about it.


>From affeb0f2d3a9af419ad7ef4ac782e1540b2f7b28 Mon Sep 17 00:00:00 2001
From: Gavin Shan <gwshan@linux.vnet.ibm.com>
Date: Wed, 27 Apr 2016 11:14:50 +1000
Subject: powerpc/eeh: Don't report error in eeh_pe_reset_and_recover()

From: Gavin Shan <gwshan@linux.vnet.ibm.com>

commit affeb0f2d3a9af419ad7ef4ac782e1540b2f7b28 upstream.

The function eeh_pe_reset_and_recover() is used to recover EEH
error when the passthrough device are transferred to guest and
backwards, meaning the device's driver is vfio-pci or none.
When the driver is vfio-pci that provides error_detected() error
handler only, the handler simply stops the guest and it's not
expected behaviour. On the other hand, no error handlers will
be called if we don't have a bound driver.

This ignores the error handler in eeh_pe_reset_and_recover()
that reports the error to device driver to avoid the exceptional
behaviour.

Fixes: 5cfb20b9 ("powerpc/eeh: Emulate EEH recovery for VFIO devices")
Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Reviewed-by: Russell Currey <ruscur@russell.cc>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 arch/powerpc/kernel/eeh_driver.c |    3 ---
 1 file changed, 3 deletions(-)

--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -504,9 +504,6 @@ int eeh_pe_reset_and_recover(struct eeh_
 	/* Save states */
 	eeh_pe_dev_traverse(pe, eeh_dev_save_state, NULL);
 
-	/* Report error */
-	eeh_pe_dev_traverse(pe, eeh_report_error, &result);
-
 	/* Issue reset */
 	ret = eeh_reset_pe(pe);
 	if (ret) {


Patches currently in stable-queue which might be from gwshan@linux.vnet.ibm.com are

queue-4.4/powerpc-eeh-restore-initial-state-in-eeh_pe_reset_and_recover.patch
queue-4.4/revert-powerpc-eeh-fix-crash-in-eeh_add_device_early-on-cell.patch
queue-4.4/powerpc-eeh-don-t-report-error-in-eeh_pe_reset_and_recover.patch