linux-kernel - [PATCH 4.8 050/125] mwifiex: fix failed to reconnect after interface disabled/enabled

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Message-Id: <20161029134949.270242082@linuxfoundation.org>
Date:   Sat, 29 Oct 2016 09:49:28 -0400
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Amitkumar Karwar <akarwar@...vell.com>,
        Kalle Valo <kvalo@...eaurora.org>
Subject: [PATCH 4.8 050/125] mwifiex: fix failed to reconnect after interface disabled/enabled

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

------------------

From: Amitkumar Karwar <akarwar@...vell.com>

commit c8ccf3ade7851054f82bf88f5fcd393a394038a3 upstream.

Recent patch "mwifiex: fix NULL pointer" skips extended scan event
handling when suspend is in progress. It created a problem for scan
after interface disabled/enabled case.

This patch solves the problem by checking netif_running() status.

Fixes:16d25da94f3d654 ("mwifiex: fix NULL pointer dereference during suspend")
Signed-off-by: Amitkumar Karwar <akarwar@...vell.com>
Signed-off-by: Kalle Valo <kvalo@...eaurora.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/net/wireless/marvell/mwifiex/sta_event.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/net/wireless/marvell/mwifiex/sta_event.c
+++ b/drivers/net/wireless/marvell/mwifiex/sta_event.c
@@ -708,7 +708,11 @@ int mwifiex_process_sta_event(struct mwi
 
 	case EVENT_EXT_SCAN_REPORT:
 		mwifiex_dbg(adapter, EVENT, "event: EXT_SCAN Report\n");
-		if (adapter->ext_scan && !priv->scan_aborting)
+		/* We intend to skip this event during suspend, but handle
+		 * it in interface disabled case
+		 */
+		if (adapter->ext_scan && (!priv->scan_aborting ||
+					  !netif_running(priv->netdev)))
 			ret = mwifiex_handle_event_ext_scan_report(priv,
 						adapter->event_skb->data);