linux-kernel - Re: MFD: mutex from ISR in ezx-pcap?

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Message-ID: <4A4B088A.9030905@gmail.com>
Date:	Wed, 01 Jul 2009 08:56:10 +0200
From:	Jiri Slaby <jirislaby@...il.com>
To:	Daniel Ribeiro <drwyrm@...il.com>
CC:	sameo@...ux.intel.com, LKML <linux-kernel@...r.kernel.org>,
	laforge@...nezx.org
Subject: Re: MFD: mutex from ISR in ezx-pcap?

On 06/30/2009 10:57 AM, Daniel Ribeiro wrote:
> Em Ter, 2009-06-30 às 00:11 +0200, Jiri Slaby escreveu: 
>> so that
>> pcap_adc_irq shouldn't sleep, right? Or maybe I missed something again...
> 
> No. Interrupts are enabled again before pcap_adc_irq() runs.
> 
> pcap_isr_work() doesn't call pcap_adc_irq directly, it calls the
> irq_flow_handler, handle_simple_irq(), which needs to run with
> interrupts disabled. Interrupts are enabled again on handle_IRQ_event(),
> as pcap_adc_irq is requested _without_ IRQF_DISABLED.

Correct. Thanks for clarification. I posted at least a lock fix which
made me poke in this all.
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