linux-kernel - Re: [PATCH 18/18] dmaengine/amba-pl08x: Call pl08x_free_txd() instead of calling kfree() directly

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Date:	Fri, 29 Jul 2011 17:08:00 +0530
From:	viresh kumar <viresh.kumar@...com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	"linus.walleij@...aro.org" <linus.walleij@...aro.org>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	"dan.j.williams@...el.com" <dan.j.williams@...el.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	Armando VISCONTI <armando.visconti@...com>,
	Shiraz HASHIM <shiraz.hashim@...com>,
	Vipin KUMAR <vipin.kumar@...com>,
	Rajeev KUMAR <rajeev-dlh.kumar@...com>,
	Deepak SIKRI <deepak.sikri@...com>,
	Vipul Kumar SAMAR <vipulkumar.samar@...com>,
	Amit VIRDI <Amit.VIRDI@...com>,
	Pratyush ANAND <pratyush.anand@...com>,
	Bhupesh SHARMA <bhupesh.sharma@...com>,
	"viresh.linux@...il.com" <viresh.linux@...il.com>
Subject: Re: [PATCH 18/18] dmaengine/amba-pl08x: Call pl08x_free_txd()	instead
 of calling kfree() directly

On 07/29/2011 04:45 PM, Russell King - ARM Linux wrote:
>> > @@ -1193,7 +1193,7 @@ static int pl08x_prep_channel_resources(struct pl08x_dma_chan *plchan,
>> >  
>> >  	num_llis = pl08x_fill_llis_for_desc(pl08x, txd);
>> >  	if (!num_llis) {
>> > -		kfree(txd);
>> > +		pl08x_free_txd(pl08x, txd);
> pl08x_free_txd() is supposed to be called under the channel spinlock,
> which is why it isn't used here.  We don't want to hold the spinlock
> throughout the LLI filling because that could cause some problems,
> and potentially worsen IRQ latency.
> 
> It's something which needs more work...

Maybe we can place lock-unlock around this call to pl08x_free_txd()?

-- 
viresh
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