[PATCH 4.4 66/99] powerpc/eeh: Dont report error in eeh_pe_reset_and_recover()

From: Greg Kroah-Hartman
Date: Sun Jun 05 2016 - 17:44:59 EST

4.4-stable review patch. If anyone has any objections, please let me know.


From: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>

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

Fixes: 5cfb20b9 ("powerpc/eeh: Emulate EEH recovery for VFIO devices")
Signed-off-by: Gavin Shan <gwshan@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Russell Currey <ruscur@xxxxxxxxxx>
Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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) {