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

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Message-ID: <4A493BF9.7010304@gmail.com>
Date:	Tue, 30 Jun 2009 00:11:05 +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 06/29/2009 10:20 PM, Daniel Ribeiro wrote:
> Em Seg, 2009-06-29 às 21:34 +0200, Jiri Slaby escreveu:
>> pcap_adc_irq tries to perform non-atomic operations in ISR which is not
>> allowed. Above that, it may deadlock.
>>
>> Since all the operations there (read, write, mutex locking) may sleep,
>> any objections to convert the ISR contents to a workqueue?
> 
> pcap_adc_irq actually already runs from a workqueue (pcap_isr_work).

Aha, thanks, there is a specific irq handler. Ok, sounds fair.

But interrupts are disabled in pcap_isr_work anyway, so that
pcap_adc_irq shouldn't sleep, right? Or maybe I missed something again...
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