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SubjectRe: [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 <> 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 <>


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

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