ibmvnic: continue fatal error reset after passive init

BugLink: https://bugs.launchpad.net/bugs/1913486
[ Upstream commit 1f45dc22066797479072978feeada0852502e180 ]

Commit f9c6cea0b385 ("ibmvnic: Skip fatal error reset after passive init")
says "If the passive
CRQ initialization occurs before the FATAL reset task is processed,
the FATAL error reset task would try to access a CRQ message queue
that was freed, causing an oops. The problem may be most likely to
occur during DLPAR add vNIC with a non-default MTU, because the DLPAR
process will automatically issue a change MTU request.
Fix this by not processing fatal error reset if CRQ is passively
initialized after client-driven CRQ initialization fails."

Even with this commit, we still see similar kernel crashes. In order
to completely solve this problem, we'd better continue the fatal error
reset, capture the kernel crash, and try to fix it from that end.

Fixes: f9c6cea0b385 ("ibmvnic: Skip fatal error reset after passive init")
Signed-off-by: Lijun Pan <ljp@linux.ibm.com>
Link: https://lore.kernel.org/r/20201219214034.21123-1-ljp@linux.ibm.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: William Breathitt Gray <william.gray@canonical.com>

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 47b8ce7822c092682fe97e3fe0cedee35b638a44..9040340fad198b2272df06d238e12d34593a6f55 100644 (file)
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2152,8 +2152,7 @@ static void __ibmvnic_reset(struct work_struct *work)
                                rc = do_hard_reset(adapter, rwi, reset_state);
                                rtnl_unlock();
                        }
-               } else if (!(rwi->reset_reason == VNIC_RESET_FATAL &&
-                               adapter->from_passive_init)) {
+               } else {
                        rc = do_reset(adapter, rwi, reset_state);
                }
                kfree(rwi);