From 62e6685470fb04fb7688ecef96c39160498721d5 Mon Sep 17 00:00:00 2001 From: Oliver Neukum Date: Sat, 27 Feb 2010 20:56:22 +0100 Subject: [PATCH] usb: cdc-wdm:Fix loss of data due to autosuspend The guarding flag must be set and tested under spinlock and cleared before the URBs are resubmitted in resume. Signed-off-by: Oliver Neukum Signed-off-by: Greg Kroah-Hartman --- drivers/usb/class/cdc-wdm.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c index a6b5e9fd0714..07c12974fe14 100644 --- a/drivers/usb/class/cdc-wdm.c +++ b/drivers/usb/class/cdc-wdm.c @@ -794,14 +794,17 @@ static int wdm_suspend(struct usb_interface *intf, pm_message_t message) dev_dbg(&desc->intf->dev, "wdm%d_suspend\n", intf->minor); mutex_lock(&desc->lock); + spin_lock_irq(&desc->iuspin); #ifdef CONFIG_PM if ((message.event & PM_EVENT_AUTO) && (test_bit(WDM_IN_USE, &desc->flags) || test_bit(WDM_RESPONDING, &desc->flags))) { + spin_unlock_irq(&desc->iuspin); rv = -EBUSY; } else { #endif set_bit(WDM_SUSPENDING, &desc->flags); + spin_unlock_irq(&desc->iuspin); cancel_work_sync(&desc->rxwork); kill_urbs(desc); #ifdef CONFIG_PM @@ -831,8 +834,8 @@ static int wdm_resume(struct usb_interface *intf) dev_dbg(&desc->intf->dev, "wdm%d_resume\n", intf->minor); mutex_lock(&desc->lock); - rv = recover_from_urb_loss(desc); clear_bit(WDM_SUSPENDING, &desc->flags); + rv = recover_from_urb_loss(desc); mutex_unlock(&desc->lock); return rv; } -- 2.20.1