linux-kernel - RE: [PATCH v6 1/1] PRUSS UIO driver support

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <B85A65D85D7EB246BE421B3FB0FBB593024BF3601C@dbde02.ent.ti.com>
Date:	Tue, 1 Mar 2011 10:15:27 +0530
From:	"TK, Pratheesh Gangadhar" <pratheesh@...com>
To:	"Hans J. Koch" <hjk@...sjkoch.de>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...e.de" <gregkh@...e.de>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"sshtylyov@...sta.com" <sshtylyov@...sta.com>,
	"arnd@...db.de" <arnd@...db.de>,
	"Chatterjee, Amit" <amit.chatterjee@...com>,
	"davinci-linux-open-source@...ux.davincidsp.com" 
	<davinci-linux-open-source@...ux.davincidsp.com>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: RE: [PATCH v6 1/1] PRUSS UIO driver support

Hi,

> -----Original Message-----
> From: Hans J. Koch [mailto:hjk@...sjkoch.de]
> Sent: Tuesday, March 01, 2011 2:57 AM
> To: TK, Pratheesh Gangadhar
> Cc: linux-kernel@...r.kernel.org; hjk@...sjkoch.de; gregkh@...e.de;
> tglx@...utronix.de; sshtylyov@...sta.com; arnd@...db.de; Chatterjee, Amit;
> davinci-linux-open-source@...ux.davincidsp.com; linux-arm-
> kernel@...ts.infradead.org
> Subject: Re: [PATCH v6 1/1] PRUSS UIO driver support
> 
> On Tue, Mar 01, 2011 at 02:31:35AM +0530, Pratheesh Gangadhar wrote:
> > +
> > +		/* Register PRUSS IRQ lines */
> > +		p->irq = IRQ_DA8XX_EVTOUT0 + cnt;
> > +		p->handler = pruss_handler;
> > +
> > +		ret = uio_register_device(&dev->dev, p);
> > +
> > +		if (ret < 0)
> > +			goto out_free;
> > +	}
> > +
> > +	spin_lock_init(&lock);
> 
> That's too late. uio_register_device() enables the irq, and your spin_lock
> is not ready at that time.

This is ok in this context as "modprobe uio_pruss" is pre-requisite for
running PRUSS firmware and without firmware running PRUSS won't
generate interrupts. Actually PRUSS INTC is not setup till we start
user application.

Thanks,
Pratheesh

--
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/