RE: [PATCH 3/3] dma: Add Freescale eDMA engine driver support

[Lu Jingchang-B35083]

> -----Original Message-----
> From: Vinod Koul [mailto:vinod.koul@xxxxxxxxx]
> Sent: Monday, September 23, 2013 12:26 PM
> To: Lu Jingchang-B35083
> Cc: djbw@xxxxxx; shawn.guo@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx;
> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx; devicetree@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH 3/3] dma: Add Freescale eDMA engine driver support
> 
> On Tue, Sep 17, 2013 at 08:08:46AM +0000, Lu Jingchang-B35083 wrote:
> > > > +	case DMA_PAUSE:
> > > > +		if (fsl_chan->edesc)
> > > > +			fsl_edma_disable_request(fsl_chan);
> > > racy here too...
> > It only set the channel HW register, no list is handled,
> > is lock needed here? Thanks!
> well thats the point while you are terminating the current trasnaction
> can
> complete and then start another one. You want to try and prevent these
> case
> also. Here you are neither locking the HW access nor the the list, so its
> juts
> waiting to crash!
Thanks! I have sent out the new v6 patch last week with holding lock here,
Could you please help review it?


Best Regards,
Jingchang



¢éì®&Þ~º&¶¬–+-±éÝ¥Šw®žË±Êâmébžìdz¹Þ)í…æèw*jg¬±¨¶‰šŽŠÝj/êäz¹ÞŠà2ŠÞ¨è­Ú&¢)ß«a¶Úþø®G«éh®æj:+v‰¨Šwè†Ù>Wš±êÞiÛaxPjØm¶ŸÿÃ-»+ƒùdš_