Ok. The version below is more similar in structure to the current code.
The essential change is that acm->throttle is now read only once so that
it can not change under our nose. Tested, still works.
Signed-off-by: Joris van Rantwijk <[EMAIL PROTECTED]>
Acked-by: Oliver Neukum <[EMAIL PROTECTED]>
------------------------------------------------------------
diff -upr -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 2007-02-05 10:11:52.000000000
+0100
@@ -324,14 +324,20 @@ static void acm_rx_tasklet(unsigned long
struct acm *acm = (void *)_acm;
struct acm_rb *buf;
struct tty_struct *tty = acm->tty;
struct acm_ru *rcv;
unsigned long flags;
- int i = 0;
+ unsigned char throttled;
dbg("Entering acm_rx_tasklet");
- if (!ACM_READY(acm) || acm->throttle)
+ if (!ACM_READY(acm))
+ return;
+
+ spin_lock(&acm->throttle_lock);
+ throttled = acm->throttle;
+ spin_unlock(&acm->throttle_lock);
+ if (throttled)
return;
next_buffer:
spin_lock_irqsave(&acm->read_lock, flags);
if (list_empty(&acm->filled_read_bufs)) {
@@ -344,26 +350,24 @@ next_buffer:
spin_unlock_irqrestore(&acm->read_lock, flags);
dbg("acm_rx_tasklet: procesing buf 0x%p, size = %d", buf, buf->size);
tty_buffer_request_room(tty, buf->size);
- if (!acm->throttle)
+ spin_lock(&acm->throttle_lock);
+ throttled = acm->throttle;
+ spin_unlock(&acm->throttle_lock);
+ if (!throttled)
tty_insert_flip_string(tty, buf->base, buf->size);
tty_flip_buffer_push(tty);
- spin_lock(&acm->throttle_lock);
- if (acm->throttle) {
- dbg("Throtteling noticed");
- memmove(buf->base, buf->base + i, buf->size - i);
- buf->size -= i;
- spin_unlock(&acm->throttle_lock);
+ if (throttled) {
+ dbg("Throttling noticed");
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->filled_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
return;
}
- spin_unlock(&acm->throttle_lock);
spin_lock_irqsave(&acm->read_lock, flags);
list_add(&buf->list, &acm->spare_read_bufs);
spin_unlock_irqrestore(&acm->read_lock, flags);
goto next_buffer;
-------------------------------------------------------------------------
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