Subject: Re: [GIT PULL]: firmware patches for building firmware into kernel
From: Jaswinder Singh <jaswinder@infradead.org>
To: David Dillow <dave@thedillows.org>
Cc: David Woodhouse <dwmw2@infradead.org>, LKML <linux-kernel@vger.kernel.org>,
       Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Andrew Morton <akpm@linux-foundation.org>
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Date: Fri, 08 Aug 2008 10:03:24 +0530
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Hello Dave,

On Fri, 2008-08-08 at 00:10 -0400, David Dillow wrote:

> I'll take a closer look when I'm awake, but there are some nitpicky
> style issues remaining:
> 

Currently I use ﻿checkpatch.pl scripts for styles problem:

#./scripts/checkpatch.pl 00*
total: 0 errors, 0 warnings, 241 lines checked

0001-firmware-avoiding-multiple-replication-for-same-fir.patch has no obvious style problems and is ready for submission.

Please give me your script I will try with your scripts.

> > diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c
> > index 6074321..71ec20d 100644
> > --- a/drivers/base/firmware_class.c
> > +++ b/drivers/base/firmware_class.c
> 
> > @@ -568,19 +569,22 @@ void release_firmware(const struct firmware *fw)
> >  {
> >  	struct firmware_list *flst;
> >  
> > +	mutex_lock(&fw_lock);
> >  	if (fw)
> >  		list_for_each_entry(flst, &firmwarelist, list)
> >  			if (fw == flst->fw) {
> >  				printk(KERN_INFO
> >  				       "firmware: releasing %s count %d\n",
> >  				       flst->name, flst->count);
> > -				mutex_lock(&fw_lock);
> >  				flst->count--;
> > -				mutex_unlock(&fw_lock);
> > -				if (flst->count == 0)
> > -					__release_firmware(fw, flst);
> > -				return;
> > +				if (flst->count == 0) {
> > +					mutex_unlock(&fw_lock);
> > +					return __release_firmware(fw, flst);
> > +				}
> > +				goto out;
> >  			}
> > +out:
> > +	mutex_unlock(&fw_lock);
> >  }
> 
> You don't need the 'goto out', a break will work fine. 

Earlier I was also using break. 
For a safe side I used goto as If some one write more code it will not
make any problem.

> And you'll not be
> pressed up against the right side of the screen if you just do
> 	if (!fw)
> 		return;
> at the top of the function.
>  

Yes, I also think about this. But this is not an issue as it is < 80
and every thing is coming in one line only.

> > @@ -598,6 +602,7 @@ void release_firmware_all(const struct firmware *fw)
> 
> I still don't like this exception to the get/put ref-counting. Is this
> used anywhere else in your series, or was typhoon the only one?
> 
> > > Also, was it legal to call release_firmware() from an atomic context? It can now
> > > sleep, which may be an issue...
> >
> > yes, release_firmware can sleep. 
> > So now release_firmware also joined the family of request_firmware.
> 
> The question wasn't if it can sleep now, it was if it could sleep before
> you started changing it. I now know that it has always called vfree(),
> so it has always needed to be able to sleep.
> 
> > Any how release_firmware will be called below request_firmware or during
> > exit, I do not think this will make any issue.
> 
> I need to run down code to see if my thoughts are realistic, but say
> eth0 was a typhoon:
> 
> modprobe typhoon
> ip link set eth0 up
> rmmod typhoon
> <firmware unloaded>
> <sleep in typhoon_remove_one() waiting for 'ip link set eth0 down'>
> <Tx timeout, needing to reset and reload firmware>
> Boom.

David Woodhouse what you think about this.

Thank you,

Jaswinder Singh.

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