From: Tony LIU <junjie.liu@freescale.com>
Date: Fri, 20 Jul 2012 02:11:06 +0000 (+0800)
Subject: ENGR00217717 mfgtool firmware will crash during mfgtool running
X-Git-Url: https://git.karo-electronics.de/?p=karo-tx-linux.git;a=commitdiff_plain;h=fd61546e4be3836284933f730dfa5845055fdc6d

ENGR00217717 mfgtool firmware will crash during mfgtool running

- the root cause of this issue is there is no protection for
  the resource which will be accessed by multiple thread

Signed-off-by: Tony LIU <junjie.liu@freescale.com>
---

diff --git a/drivers/usb/gadget/function/fsl_updater.c b/drivers/usb/gadget/function/fsl_updater.c
index 8b4af624ba83..72c14ba03ace 100644
--- a/drivers/usb/gadget/function/fsl_updater.c
+++ b/drivers/usb/gadget/function/fsl_updater.c
@@ -70,9 +70,11 @@ static u32 count_list(struct list_head *l)
 	u32 count = 0;
 	struct list_head *tmp;
 
+	mutex_lock(&utp_context.lock);
 	list_for_each(tmp, l) {
 		count++;
 	}
+	mutex_unlock(&utp_context.lock);
 
 	return count;
 }