Re: [PATCH] USB: cdc-acm: Prevent data loss when filling tty buffer.
From: Oliver Neukum
Date: Tue Mar 22 2011 - 04:07:22 EST
Am Montag, 21. März 2011, 17:56:12 schrieb Alan Cox:
> On Mon, 21 Mar 2011 15:52:25 +0000
> Toby Gray <toby.gray@xxxxxxxxxxx> wrote:
> > When sending large quantities of data through a CDC ACM channel it is possible
> > for data to be lost when attempting to copy the data to the tty buffer. This
> > occurs due to the return value from tty_insert_flip_string not being checked.
> For a tty that is normally the right thing to do - no flow control was
> asserted and the internal 64K of buffering was overrun so discard.
But should we really randomly discard a part of a buffer?
If this happens the better alternative approach would be to nuke all buffers
we currently have.
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