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Re: [Qemu-devel] [PATCH 1/3] ide: don't loose pending dma state

From: Paolo Bonzini
Subject: Re: [Qemu-devel] [PATCH 1/3] ide: don't loose pending dma state
Date: Thu, 24 Mar 2016 15:07:20 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.6.0

On 24/03/2016 14:38, Pavel Butsykin wrote:
> Look at the ide_sector_read_cb function. The ->dma_cmd field is used
> only for the DMA, we can't use the ide_cmd_is_read macro for PIO or
> ATAPI. In fact, the ide_handle_rw_error looks like a generic function
> and I do not see any good reason to move the handling of the dma_cmd
> field(especially in the context of bug fixes).

I agree now.

>> However, if it works, using dma_cmd would be better than using the
>> dma_cb.
> We can't use the dma_cmd field to build the ATAPI ->error_status. Your
> proposal is quite logical, but please look at the 3rd patch, there to
> build ->error_status we can use the same dma_cb, it is very convenient.

Couldn't you just add a new dma_cmd value IDE_DMA_ATAPI, and set it
before every call to ide_start_dma(s, ide_atapi_cmd_read_dma_cb)?



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