From: Juliet Kim <julietk@linux.vnet.ibm.com>
To: netdev@vger.kernel.org
Cc: julietk@linux.vnet.ibm.com, tlfalcon@linux.vnet.ibm.com,
linuxppc-dev@lists.ozlabs.org
Subject: [PATCH net] ibmvnic: Skip fatal error reset after passive init
Date: Thu, 30 Apr 2020 13:22:11 -0500 [thread overview]
Message-ID: <20200430182211.24211-1-julietk@linux.vnet.ibm.com> (raw)
During MTU change, the following events may happen.
Client-driven CRQ initialization fails due to partner’s CRQ closed,
causing client to enqueue a reset task for FATAL_ERROR. Then passive
(server-driven) CRQ initialization succeeds, causing client to
release CRQ and enqueue a reset task for failover. 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.
Signed-off-by: Juliet Kim <julietk@linux.vnet.ibm.com>
---
drivers/net/ethernet/ibm/ibmvnic.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 4bd33245bad6..3de549c6c693 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -2189,7 +2189,8 @@ static void __ibmvnic_reset(struct work_struct *work)
rc = do_hard_reset(adapter, rwi, reset_state);
rtnl_unlock();
}
- } else {
+ } else if (!(rwi->reset_reason == VNIC_RESET_FATAL &&
+ adapter->from_passive_init)) {
rc = do_reset(adapter, rwi, reset_state);
}
kfree(rwi);
--
2.16.4
next reply other threads:[~2020-04-30 18:26 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 18:22 Juliet Kim [this message]
2020-04-30 20:28 ` [PATCH net] ibmvnic: Skip fatal error reset after passive init David Miller
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