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Message-ID: <20090924211459.GB27963@localhost> Date: Thu, 24 Sep 2009 23:15:00 +0200 From: Johan Hovold <jhovold@...il.com> To: Alan Cox <alan@...rguk.ukuu.org.uk> Cc: Oliver Neukum <oliver@...kum.org>, Johan Hovold <jhovold@...il.com>, Greg Kroah-Hartman <gregkh@...e.de>, linux-usb@...r.kernel.org, Alan Cox <alan@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] USB: ftdi_sio: Remove tty->low_latency. On Thu, Sep 24, 2009 at 08:21:07PM +0100, Alan Cox wrote: > On Thu, 24 Sep 2009 21:03:47 +0200 > Oliver Neukum <oliver@...kum.org> wrote: > > Am Donnerstag, 24. September 2009 17:40:23 schrieb Johan Hovold: > > > Is there a reason why this was not fixed in ftdi_sio (and whiteheat?) > > > along with the other drivers? > > No good reason. They escaped my grep pattern. Mea culpa. > ftdi_sio is correct with low_latency set as it uses a work queue to > process the packets received. AFAICT it only uses the work queue if tty_buffer_request_room fails to allocate enough space. This being the exception, the completion handler normally processes the packets in interrupt context and this is where I get my lockdep traces (and it happens every time I hit the echo or throttle paths). /Johan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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