Re: [SOLVED] Serial buffer corruption [was Re: FTDI usb-serial possible bug]

[Paul Fulghum <paulkf@microgate.com>]

On Sat, 2007-05-05 at 18:58 +0200, Antonino Ingargiola wrote:
> This patch does not solve the problem with the cdc_acd driver. I still
> need to flush two times to really flush the input. And the "secondary
> buffer" still seems 26 bytes (as before).

I missed a bit, try this.

--- a/drivers/usb/class/cdc-acm.c	2007-04-25 22:08:32.000000000 -0500
+++ b/drivers/usb/class/cdc-acm.c	2007-05-05 12:03:19.000000000 -0500
@@ -335,8 +335,6 @@ static void acm_rx_tasklet(unsigned long
 	spin_lock_irqsave(&acm->throttle_lock, flags);
 	throttled = acm->throttle;
 	spin_unlock_irqrestore(&acm->throttle_lock, flags);
-	if (throttled)
-		return;
 
 next_buffer:
 	spin_lock_irqsave(&acm->read_lock, flags);
@@ -355,18 +353,9 @@ next_buffer:
 	spin_lock_irqsave(&acm->throttle_lock, flags);
 	throttled = acm->throttle;
 	spin_unlock_irqrestore(&acm->throttle_lock, flags);
-	if (!throttled)
-		tty_insert_flip_string(tty, buf->base, buf->size);
+	tty_insert_flip_string(tty, buf->base, buf->size);
 	tty_flip_buffer_push(tty);
 
-	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_lock_irqsave(&acm->read_lock, flags);
 	list_add(&buf->list, &acm->spare_read_bufs);
 	spin_unlock_irqrestore(&acm->read_lock, flags);


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