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| author | Oliver Neukum <oliver@neukum.org> | 2007-07-24 15:13:42 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2007-07-30 13:27:46 -0700 |
| commit | 3ddad8232c3802f7a602d1ea24938a8067114479 (patch) | |
| tree | ba648621b4c4df0846e222c6c81843bca6077b55 /drivers/usb/serial/usb-serial.c | |
| parent | f42449003114cc17cda0458c14f2deadfadf9f63 (diff) | |
| download | lwn-3ddad8232c3802f7a602d1ea24938a8067114479.tar.gz lwn-3ddad8232c3802f7a602d1ea24938a8067114479.zip | |
USB: fix BUG: sleeping function called from invalid context at /home/jeremy/hg/xen/paravirt/linux/drivers/usb/core/urb.c:524, in_atomic():1, irqs_disabled():0
Clearly there's a bug in
drivers/usb/serial/usb-serial.c:usb_serial_put(). It shouldn't call
kref_put() while holding a spinlock.
Signed-off-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/serial/usb-serial.c')
| -rw-r--r-- | drivers/usb/serial/usb-serial.c | 17 |
1 files changed, 8 insertions, 9 deletions
diff --git a/drivers/usb/serial/usb-serial.c b/drivers/usb/serial/usb-serial.c index 5e1cf78c7786..9bf01a5efc84 100644 --- a/drivers/usb/serial/usb-serial.c +++ b/drivers/usb/serial/usb-serial.c @@ -60,19 +60,19 @@ static struct usb_driver usb_serial_driver = { static int debug; static struct usb_serial *serial_table[SERIAL_TTY_MINORS]; /* initially all NULL */ -static spinlock_t table_lock; +static DEFINE_MUTEX(table_lock); static LIST_HEAD(usb_serial_driver_list); struct usb_serial *usb_serial_get_by_index(unsigned index) { struct usb_serial *serial; - spin_lock(&table_lock); + mutex_lock(&table_lock); serial = serial_table[index]; if (serial) kref_get(&serial->kref); - spin_unlock(&table_lock); + mutex_unlock(&table_lock); return serial; } @@ -84,7 +84,7 @@ static struct usb_serial *get_free_serial (struct usb_serial *serial, int num_po dbg("%s %d", __FUNCTION__, num_ports); *minor = 0; - spin_lock(&table_lock); + mutex_lock(&table_lock); for (i = 0; i < SERIAL_TTY_MINORS; ++i) { if (serial_table[i]) continue; @@ -106,10 +106,10 @@ static struct usb_serial *get_free_serial (struct usb_serial *serial, int num_po serial_table[i] = serial; serial->port[j++]->number = i; } - spin_unlock(&table_lock); + mutex_unlock(&table_lock); return serial; } - spin_unlock(&table_lock); + mutex_unlock(&table_lock); return NULL; } @@ -172,9 +172,9 @@ static void destroy_serial(struct kref *kref) void usb_serial_put(struct usb_serial *serial) { - spin_lock(&table_lock); + mutex_lock(&table_lock); kref_put(&serial->kref, destroy_serial); - spin_unlock(&table_lock); + mutex_unlock(&table_lock); } /***************************************************************************** @@ -1129,7 +1129,6 @@ static int __init usb_serial_init(void) return -ENOMEM; /* Initialize our global data */ - spin_lock_init(&table_lock); for (i = 0; i < SERIAL_TTY_MINORS; ++i) { serial_table[i] = NULL; } |