Re: [PATCH linux-2.6-block:post-2.6.15 09/11] blk: implement ide_driver_t->protocol_changed callback

On 11/24/05, Tejun Heo <[email protected]> wrote:
> 09_blk_ide-add-protocol_changed.patch
>
>         This patch implements protocol_changed callback for IDE HL
>         drivers.  The callback is called whenever transfer protocol
>         changes (DMA / multisector PIO / PIO).  The callback is
>         sometimes with context and sometimes without, sometimes with
>         queuelock, sometimes not.  So, actual callbacks should be
>         written carefully.
>
>         To hook dma setting changes, this function implements
>         ide_dma_on() and ide_dma_off_quietly() which notifies protocl
>         change and calls low level driver callback.  __ide_dma_off()
>         is renamed to ide_dma_off() for consistency.  All dma on/off
>         operations must be done by using these wrapper functions.
>
> Signed-off-by: Tejun Heo <[email protected]>

NACK

Please fix the real problem instead
(changing of DMA and multicount PIO settings is racy).

Bartlomiej
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• References:
  • [PATCH linux-2.6-block:post-2.6.15 00/11] blk: reimplementation of I/O barrier
    • From: Tejun Heo <[email protected]>
  • Re: [PATCH linux-2.6-block:post-2.6.15 09/11] blk: implement ide_driver_t->protocol_changed callback
    • From: Tejun Heo <[email protected]>

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