[PATCH 5/5] Add DMA engine driver for Freescale MPC85xx processors.
shannon.nelson at intel.com
Wed Sep 12 01:15:30 EST 2007
>From: Scott Wood [mailto:scottwood at freescale.com]
>Sent: Tuesday, September 11, 2007 7:20 AM
>To: Zhang Wei-r63237
>Cc: Nelson, Shannon; paulus at samba.org;
>linuxppc-dev at ozlabs.org; Williams, Dan J; linux-kernel at vger.kernel.org
>Subject: Re: [PATCH 5/5] Add DMA engine driver for Freescale
>On Tue, Sep 11, 2007 at 06:10:53PM +0800, Zhang Wei-r63237 wrote:
>> > >+
>> > >+ fsl_dma_memcpy_issue_pending(chan);
>> > >+ while (fsl_dma_is_complete(chan, cookie, NULL, NULL)
>> > >+ != DMA_SUCCESS);
>> > Again, is it possible to hang your thread here?
>> > [...]
>> I'll add msleep here.
>I think what was being sought was a timout, causing the test to return
Either a timeout to stop the polling, or msleep() followed by a single
call to fsl_dma_is_complete(). However, using the msleep() method is
likely to be kinder to the rest of the kernel than polling for very
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