From: Fernando Guzman Lugo <x0095840@ti.com>
Date: Thu, 28 Jan 2010 02:04:02 +0000 (-0600)
Subject: Mailbox: Check valid registered callback before calling
X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=9caae4d87ca0087edd6c02efd674f13fe0419ee9;p=deliverable%2Flinux.git

Mailbox: Check valid registered callback before calling

This patch checks if the mailbox user has assinged a valid
callback fuction before calling it.

Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com>
Signed-off-by: Hiroshi DOYU <Hiroshi.DOYU@nokia.com>
---

diff --git a/arch/arm/plat-omap/mailbox.c b/arch/arm/plat-omap/mailbox.c
index 77c23f5a0037..72efbe5be578 100644
--- a/arch/arm/plat-omap/mailbox.c
+++ b/arch/arm/plat-omap/mailbox.c
@@ -146,7 +146,8 @@ static void mbox_rx_work(struct work_struct *work)
 
 		msg = (mbox_msg_t)rq->special;
 		blk_end_request_all(rq, 0);
-		mbox->rxq->callback((void *)msg);
+		if (mbox->rxq->callback)
+			mbox->rxq->callback((void *)msg);
 	}
 }