linux-kernel - Re: [PATCH 03/10] ide: destroy DMA mappings after ending DMA

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Message-ID: <49B52113.3000804@ru.mvista.com>
Date:	Mon, 09 Mar 2009 17:00:51 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/10] ide: destroy DMA mappings after ending DMA

Hello.

Bartlomiej Zolnierkiewicz wrote:

> From: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
> Subject: [PATCH] ide: destroy DMA mappings after ending DMA
>
> Move ide_destroy_dmatable() call out from ->dma_end method to
> {ide_pc,cdrom_newpc,ide_dma}_intr(), ide_dma_timeout_retry()
> and sgiioc4_resetproc().
>
> This causes minor/safe behavior changes w.r.t.:
> * cmd64x.c::cmd64{8,x}_dma_end()
> * cs5536.c::cs5536_dma_end()
> * icside.c::icside_dma_end()
> * it821x.c::it821x_dma_end()
> * scc_pata.c::__scc_dma_end()
> * sl82c105.c::sl82c105_dma_end()
> * tx4939ide.c::tx4939ide_dma_end()
>
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
>   

Acked-by: Sergei Shtylyov <sshtylyov@...mvista.com>
> Index: b/drivers/ide/sgiioc4.c
> ===================================================================
> --- a/drivers/ide/sgiioc4.c
> +++ b/drivers/ide/sgiioc4.c
> @@ -259,7 +259,6 @@ static int sgiioc4_dma_end(ide_drive_t *
>  	}
>  
>  	drive->waiting_for_dma = 0;
> -	ide_destroy_dmatable(drive);
>  
>  	return dma_stat;
>  }
> @@ -284,6 +283,7 @@ static void
>  sgiioc4_resetproc(ide_drive_t * drive)
>  {
>  	sgiioc4_dma_end(drive);
> +	ide_destroy_dmatable(drive);
>  	sgiioc4_clearirq(drive);
>  }

   I somewhat doubt that resetproc() can be called with DMA still active...

MBR, Sergei


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