linux-kernel - [PATCH 4.0 069/148] staging: vt6655: lock MACvWriteBSSIDAddress.

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Date:	Wed,  3 Jun 2015 21:08:59 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Malcolm Priestley <tvboxspy@...il.com>
Subject: [PATCH 4.0 069/148] staging: vt6655: lock MACvWriteBSSIDAddress.

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

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

From: Malcolm Priestley <tvboxspy@...il.com>

commit 664a5c1d1e33cd89cb7883e8c74638cc482b5da7 upstream.

This function selects page 1 and cause intermittent problems on
interrupt handler.

lock call with spin_lock_irqsave.

Signed-off-by: Malcolm Priestley <tvboxspy@...il.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/staging/vt6655/device_main.c |    9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

--- a/drivers/staging/vt6655/device_main.c
+++ b/drivers/staging/vt6655/device_main.c
@@ -1414,9 +1414,16 @@ static void vnt_bss_info_changed(struct
 
 	priv->current_aid = conf->aid;
 
-	if (changed & BSS_CHANGED_BSSID)
+	if (changed & BSS_CHANGED_BSSID) {
+		unsigned long flags;
+
+		spin_lock_irqsave(&priv->lock, flags);
+
 		MACvWriteBSSIDAddress(priv->PortOffset, (u8 *)conf->bssid);
 
+		spin_unlock_irqrestore(&priv->lock, flags);
+	}
+
 	if (changed & BSS_CHANGED_BASIC_RATES) {
 		priv->basic_rates = conf->basic_rates;
 


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