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authorOliver Neukum <oliver@neukum.org>2011-04-29 14:12:21 +0200
committerGreg Kroah-Hartman <gregkh@suse.de>2011-04-29 17:04:40 -0700
commitd771d8aa37805f5bf75808b12b737f39ee97f5d4 (patch)
treebd491a31ffc2803d78b45fa23b7c347a35af717f /drivers/usb/class
parentb4026c4584cd70858d4d3450abfb1cd0714d4f32 (diff)
USB: cdc-wdm: reset handling according to new requirements
This patch - ensures no IO takes place during resets - reports resets to user space Signed-off-by: Oliver Neukum <oneukum@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/class')
-rw-r--r--drivers/usb/class/cdc-wdm.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/drivers/usb/class/cdc-wdm.c b/drivers/usb/class/cdc-wdm.c
index a97c018dd41..2b9ff518b50 100644
--- a/drivers/usb/class/cdc-wdm.c
+++ b/drivers/usb/class/cdc-wdm.c
@@ -542,6 +542,8 @@ static int wdm_open(struct inode *inode, struct file *file)
mutex_lock(&desc->lock);
if (!desc->count++) {
+ desc->werr = 0;
+ desc->rerr = 0;
rv = usb_submit_urb(desc->validity, GFP_KERNEL);
if (rv < 0) {
desc->count--;
@@ -853,6 +855,18 @@ static int wdm_pre_reset(struct usb_interface *intf)
struct wdm_device *desc = usb_get_intfdata(intf);
mutex_lock(&desc->lock);
+ kill_urbs(desc);
+
+ /*
+ * we notify everybody using poll of
+ * an exceptional situation
+ * must be done before recovery lest a spontaneous
+ * message from the device is lost
+ */
+ spin_lock_irq(&desc->iuspin);
+ desc->rerr = -EINTR;
+ spin_unlock_irq(&desc->iuspin);
+ wake_up_all(&desc->wait);
return 0;
}