diff options
| -rw-r--r-- | drivers/usb/class/cdc-wdm.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index eb86d1c9b4a4..9c686751ddc1 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -726,7 +726,7 @@ static int wdm_open(struct inode *inode, struct file *file) rv = -EBUSY; goto out; } - + smp_rmb(); /* ordered against wdm_wwan_port_stop() */ rv = usb_autopm_get_interface(desc->intf); if (rv < 0) { dev_err(&desc->intf->dev, "Error autopm - %d\n", rv); @@ -868,8 +868,10 @@ static void wdm_wwan_port_stop(struct wwan_port *port) poison_urbs(desc); desc->manage_power(desc->intf, 0); clear_bit(WDM_READ, &desc->flags); - clear_bit(WDM_WWAN_IN_USE, &desc->flags); unpoison_urbs(desc); + smp_wmb(); /* ordered against wdm_open() */ + /* this must be last lest we open a poisoned device */ + clear_bit(WDM_WWAN_IN_USE, &desc->flags); } static void wdm_wwan_port_tx_complete(struct urb *urb) |