linux-kernel - Re: [PATCH] ipwireless: driver for 3G PC Card

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Message-ID: <20080201234315.GA1761@elf.ucw.cz>
Date:	Sat, 2 Feb 2008 00:43:15 +0100
From:	Pavel Machek <pavel@....cz>
To:	David Sterba <dsterba@...e.cz>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	jkosina@...e.cz, benm@...metric.co.nz, stephen@...metric.co.nz
Subject: Re: [PATCH] ipwireless: driver for 3G PC Card

Hi!

> > > +static irqreturn_t ipwireless_handle_v1_interrupt(int irq,
> > > +						  struct ipw_hardware *hw)
> > > +{
> > > +	unsigned short irqn;
> > > +	unsigned short ack;
> > > +
> > > +	irqn = inw(hw->base_port + IOIR);
> > > +
> > > +	/* Check if card is present */
> > > +	if (irqn == (unsigned short) 0xFFFF) {
> > > +		if (++hw->bad_interrupt_count >= 100) {
> > > +			/*
> > > +			 * It is necessary to disable the interrupt at this
> > > +			 * point, or the kernel hangs, interrupting repeatedly
> > > +			 * forever.
> > > +			 */
> > > +			hw->irq = irq;
> > > +			hw->removed = 1;
> > > +			disable_irq_nosync(irq);
> > > +			printk(KERN_DEBUG IPWIRELESS_PCCARD_NAME
> > > +					": Mr. Fluffy is not happy!\n");
> > > +		}
> > > +		return IRQ_HANDLED;
> >
> > Not sure how this is supposed to work. If you assume unshared
> > interrupts, it should be possible to return something and make core
> > care.
> >
> > If you are assuming shared interrupts, either you should disable on
> > first 0xFFFF (are you sure cast is needed, btw?), or not at all,
> > because it could be the other device sedning you 100 of those...
> >
> > ...so which one is it?
> 
> Shared. It'll check if device has interrupt pending, else exit.

can you remove bad_interrupt_count? It seems very random in presence
of shared interrupt.

> > > +static int config_ipwireless(struct ipw_dev *ipw)
> > > +{
> > > +	struct pcmcia_device *link = ipw->link;
> > > +	int ret;
> > > +	config_info_t conf;
> > > +	tuple_t tuple;
> > > +	unsigned short buf[64];
> > > +	cisparse_t parse;
> > > +	unsigned short cor_value;
> > > +	win_req_t reqAM;
> > > +	win_req_t reqCM;
> >
> > Hiding structs BehindTypedefsIsEvil.
> 
> Unfortunatelly PCMCIA subsystem is full of these and all drivers use them. 
> I'll stay consistent for now.

Sorry if they were not yours.

> Updated patch v4 will follow.

Thanks!
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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