[PATCH 2/3]cdc-acm: clear throttle on open

It seems that the CDC-ACM driver can get stuck in a throttling
condition.

The proposed patch fixes this by resetting the acm->throttle flag at
device open time. This patch was tested on i386, ohci-hcd with a custom
USB device and appears to fix the problem.

Signed-off-by: Joris van Rantijk <[email protected]>
Acked-by: Oliver Neukum <[email protected]>
----------------------------------------------------------

diff -ur -U5 linux-2.6.19.2-orig/drivers/usb/class/cdc-acm.c linux-2.6.19.2/drivers/usb/class/cdc-acm.c
--- /drivers/usb/class/cdc-acm.c	2007-01-10 20:10:37.000000000 +0100
+++ linux-2.6.19.2/drivers/usb/class/cdc-acm.c	2007-02-02 22:58:45.000000000 +0100
@@ -478,10 +478,12 @@
 	}
 	for (i = 0; i < acm->rx_buflimit; i++) {
 		list_add(&(acm->rb[i].list), &acm->spare_read_bufs);
 	}
 
+	acm->throttle = 0;
+
 	tasklet_schedule(&acm->urb_task);
 
 done:
 err_out:
 	mutex_unlock(&open_mutex);


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