linux-kernel - Re: [PATCH v2 2/2] hso: fix deadlock when receiving bursts of data

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Message-Id: <20140714.192758.1087918241017989929.davem@davemloft.net>
Date:	Mon, 14 Jul 2014 19:27:58 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	olivier@...rie.be
Cc:	linux-usb@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, David.Laight@...LAB.COM,
	gnomes@...rguk.ukuu.org.uk, dcbw@...hat.com, j.dumon@...ion.com
Subject: Re: [PATCH v2 2/2] hso: fix deadlock when receiving bursts of data

From: Olivier Sobrie <olivier@...rie.be>
Date: Mon, 14 Jul 2014 12:08:50 +0200

> When the module sends bursts of data, sometimes a deadlock happens in
> the hso driver when the tty buffer doesn't get the chance to be flushed
> quickly enough.
> 
> Remove the endless while loop in function put_rxbuf_data() which is
> called by the urb completion handler.
> If there isn't enough room in the tty buffer, discards all the data
> received in the URB.
> 
> Cc: David Miller <davem@...emloft.net>
> Cc: David Laight <David.Laight@...LAB.COM>
> Cc: One Thousand Gnomes <gnomes@...rguk.ukuu.org.uk>
> Cc: Dan Williams <dcbw@...hat.com>
> Cc: Jan Dumon <j.dumon@...ion.com>
> Signed-off-by: Olivier Sobrie <olivier@...rie.be>
> ---
> Changes in v2:
>  - remove the unthrottle timer added in the previous patch version
>  - drop entire rx urb data if there is not enough space in tty buffer
>  - remove variable curr_rx_urb_offset from hso_serial structure

Applied, thanks.
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