From: liuji <liuji@liuji@rock-chips.com>
Date: Mon, 12 Dec 2011 01:42:45 +0000 (+0800)
Subject: Mtp: fix mtp sync operation no response,hold in error stat.
X-Git-Tag: firefly_0821_release~9712^2~14
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=bb2322bfa9ba5a1f5ecbd0ba4e098894b79acdd4;p=firefly-linux-kernel-4.4.55.git

Mtp: fix mtp sync operation no response,hold in error stat.

fix bug: while read buffer length > MTP_BULK_BUFFER_SIZE, return -1
errno=EINVAL(22)
---

diff --git a/drivers/usb/gadget/f_mtp.c b/drivers/usb/gadget/f_mtp.c
index d1c259e3eb2d..fce4346bb546 100644
--- a/drivers/usb/gadget/f_mtp.c
+++ b/drivers/usb/gadget/f_mtp.c
@@ -470,7 +470,7 @@ static ssize_t mtp_read(struct file *fp, char __user *buf,
 	DBG(cdev, "mtp_read(%d)\n", count);
 
 	if (count > MTP_BULK_BUFFER_SIZE)
-		return -EINVAL;
+        count = MTP_BULK_BUFFER_SIZE;
 
 	/* we will block until we're online */
 	DBG(cdev, "mtp_read: waiting for online state\n");