netdev - [PATCH net-next] sfc: check async completer is !NULL before calling

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Date:   Thu, 22 Sep 2016 15:47:45 +0100
From:   Bert Kenward <bkenward@...arflare.com>
To:     Dave Miller <davem@...emloft.net>
CC:     <netdev@...r.kernel.org>,
        Solarflare Linux Maintainers <linux-net-drivers@...arflare.com>
Subject: [PATCH net-next] sfc: check async completer is !NULL before calling

Add a NULL check before calling asynchronous MCDI completion functions
during device removal.

Fixes: 7014d7f6 ("sfc: allow asynchronous MCDI without completion function")
Signed-off-by: Bert Kenward <bkenward@...arflare.com>
---
 drivers/net/ethernet/sfc/mcdi.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ethernet/sfc/mcdi.c b/drivers/net/ethernet/sfc/mcdi.c
index 9fbc12a..2415209 100644
--- a/drivers/net/ethernet/sfc/mcdi.c
+++ b/drivers/net/ethernet/sfc/mcdi.c
@@ -1156,7 +1156,8 @@ void efx_mcdi_flush_async(struct efx_nic *efx)
 	 * acquired locks in the wrong order.
 	 */
 	list_for_each_entry_safe(async, next, &mcdi->async_list, list) {
-		async->complete(efx, async->cookie, -ENETDOWN, NULL, 0);
+		if (async->complete)
+			async->complete(efx, async->cookie, -ENETDOWN, NULL, 0);
 		list_del(&async->list);
 		kfree(async);
 	}
-- 
2.7.4