linux-kernel - Re: [PATCH v2 13/13] tty: pruss SUART driver

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Date:	Fri, 18 Feb 2011 19:23:49 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Alan Cox <alan@...rguk.ukuu.org.uk>
cc:	Subhasish Ghosh <subhasish@...tralsolutions.com>,
	davinci-linux-open-source@...ux.davincidsp.com,
	linux-arm-kernel@...ts.infradead.org, m-watkins@...com,
	nsekhar@...com, sachi@...tralsolutions.com,
	Greg Kroah-Hartman <gregkh@...e.de>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 13/13] tty: pruss SUART driver

On Fri, 18 Feb 2011, Alan Cox wrote:

> On Fri, 18 Feb 2011 19:17:38 +0530
> "Subhasish Ghosh" <subhasish@...tralsolutions.com> wrote:
> 
> > Hello,
> > 
> > Regarding the semaphore to mutex migration.
> > We are using down_trylock in interrupt context,
> > mutex_trylock cannot be used in interrupt context, so we cannot use mutex in 
> > our driver.
> 
> Then you probably need to rework your locking. Best bet might be to fix
> all the other stuff and report the driver, and people can think about the
> locking problem.

That semaphore is utterly useless to begin with. There are more
serious locking problems than this one. Non serialized calls to
suart_intr_clrmask/suart_intr_setmask are the most obvious ones.

Aside of that the code is complete unreadable.

Thanks,

	tglx
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