diff options
author | Alex Shi <alex.shi@linaro.org> | 2017-05-31 12:02:43 +0800 |
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committer | Alex Shi <alex.shi@linaro.org> | 2017-05-31 12:02:43 +0800 |
commit | a898540914d4136f29bc738ce593c1c501006f23 (patch) | |
tree | 9440b7f76c029143611c89ed919718ba6ff353f4 /drivers/usb/core/file.c | |
parent | d97f745e1d2fea4d2f308e5e06eee81a9a84f3f5 (diff) | |
parent | 56d847e3ef9433d7ac92376e4ba49d3cf3cb70d2 (diff) |
Merge tag 'v4.1.40' into linux-linaro-lsk-v4.1lsk-v4.1-17.06lsk-v4.1-17.05linux-linaro-lsk-v4.1
This is the 4.1.40 stable release
Diffstat (limited to 'drivers/usb/core/file.c')
-rw-r--r-- | drivers/usb/core/file.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/usb/core/file.c b/drivers/usb/core/file.c index ea337a718cc1..b3de806085f0 100644 --- a/drivers/usb/core/file.c +++ b/drivers/usb/core/file.c @@ -26,6 +26,7 @@ #define MAX_USB_MINORS 256 static const struct file_operations *usb_minors[MAX_USB_MINORS]; static DECLARE_RWSEM(minor_rwsem); +static DEFINE_MUTEX(init_usb_class_mutex); static int usb_open(struct inode *inode, struct file *file) { @@ -108,8 +109,9 @@ static void release_usb_class(struct kref *kref) static void destroy_usb_class(void) { - if (usb_class) - kref_put(&usb_class->kref, release_usb_class); + mutex_lock(&init_usb_class_mutex); + kref_put(&usb_class->kref, release_usb_class); + mutex_unlock(&init_usb_class_mutex); } int usb_major_init(void) @@ -171,7 +173,10 @@ int usb_register_dev(struct usb_interface *intf, if (intf->minor >= 0) return -EADDRINUSE; + mutex_lock(&init_usb_class_mutex); retval = init_usb_class(); + mutex_unlock(&init_usb_class_mutex); + if (retval) return retval; |