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]>
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
--- linux-2.6.19.2-orig/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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