~hc/RK356X_SDK_RELEASE.git

..	..	@@ -229,6 +229,7 @@
229	229	*/
230	230
231	231	static const char *CHIP;
	232	+static DEFINE_MUTEX(sb_mutex); /* Serialize superblock operations */
232	233
233	234	/----------------------------------------------------------------------/
234	235
..	..	@@ -2012,13 +2013,20 @@
2012	2013	{
2013	2014	struct inode *inode;
2014	2015	struct dev_data *dev;
	2016	+ int rc;
2015	2017
2016		- if (the_device)
2017		- return -ESRCH;
	2018	+ mutex_lock(&sb_mutex);
	2019	+
	2020	+ if (the_device) {
	2021	+ rc = -ESRCH;
	2022	+ goto Done;
	2023	+ }
2018	2024
2019	2025	CHIP = usb_get_gadget_udc_name();
2020		- if (!CHIP)
2021		- return -ENODEV;
	2026	+ if (!CHIP) {
	2027	+ rc = -ENODEV;
	2028	+ goto Done;
	2029	+ }
2022	2030
2023	2031	/* superblock */
2024	2032	sb->s_blocksize = PAGE_SIZE;
..	..	@@ -2055,13 +2063,17 @@
2055	2063	* from binding to a controller.
2056	2064	*/
2057	2065	the_device = dev;
2058		- return 0;
	2066	+ rc = 0;
	2067	+ goto Done;
2059	2068
2060		-Enomem:
	2069	+ Enomem:
2061	2070	kfree(CHIP);
2062	2071	CHIP = NULL;
	2072	+ rc = -ENOMEM;
2063	2073
2064		- return -ENOMEM;
	2074	+ Done:
	2075	+ mutex_unlock(&sb_mutex);
	2076	+ return rc;
2065	2077	}
2066	2078
2067	2079	/* "mount -t gadgetfs path /dev/gadget" ends up here */
..	..	@@ -2083,6 +2095,7 @@
2083	2095	static void
2084	2096	gadgetfs_kill_sb (struct super_block *sb)
2085	2097	{
	2098	+ mutex_lock(&sb_mutex);
2086	2099	kill_litter_super (sb);
2087	2100	if (the_device) {
2088	2101	put_dev (the_device);
..	..	@@ -2090,6 +2103,7 @@
2090	2103	}
2091	2104	kfree(CHIP);
2092	2105	CHIP = NULL;
	2106	+ mutex_unlock(&sb_mutex);
2093	2107	}
2094	2108
2095	2109	/----------------------------------------------------------------------/