linux-kernel - Re: [PATCH v1 3/4] spi/xilinx: Simplify irq allocation

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Message-ID: <cab4ad33-0aee-4bc4-be36-6610f19c403d@AM1EHSMHS015.ehs.local>
Date:	Tue, 9 Jul 2013 16:53:25 +0200
From:	Michal Simek <michal.simek@...inx.com>
To:	Mark Brown <broonie@...nel.org>
CC:	Michal Simek <monstr@...str.eu>,
	Michal Simek <michal.simek@...inx.com>,
	<linux-kernel@...r.kernel.org>,
	linux-spi <linux-spi@...r.kernel.org>,
	Grant Likely <grant.likely@...aro.org>,
	<spi-devel-general@...ts.sourceforge.net>
Subject: Re: [PATCH v1 3/4] spi/xilinx: Simplify irq allocation

On 07/09/2013 04:47 PM, Mark Brown wrote:
> On Tue, Jul 09, 2013 at 04:15:13PM +0200, Michal Simek wrote:
> 
>> 4. spi_master_release()
>> 5. devres_release() with irq
> 
>> If interrupt happends between 4 and 5 than it can be the problem.
>> Do I understand you correctly?
> 
> Yes.

great.

> 
>> If this is problematic case we can disable local and global interrupts
>> and add it between 2 and 3 or 3-4.
>> 	/* Disable all the interrupts just in case */
>> 	xspi->write_fn(0, regs_base + XIPIF_V123B_IIER_OFFSET);
>> 	/* Disable the global IPIF interrupt */
>> 	xspi->write_fn(0, regs_base + XIPIF_V123B_DGIER_OFFSET);
> 
>> What do you think about this solution?
> 
> That's fine, though if just manually freeing the IRQ works that's also
> OK...

yeah.


>> I have also tried to run one thing with and without this patch
>> and the results are below.
> 
>> When I add this irq disable function between 1 and 2 then
>> module removing stucks.
> 
> You'll need to wait until the device is quiesced at least if it's
> relying on the interrupt to complete operations.
> 

ok. Will send v2 of this patch.

Thanks,
Michal


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