linux-kernel - Re: [PATCH]: Fix IDE host

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Message-Id: <200710232150.14284.bzolnier@gmail.com>
Date:	Tue, 23 Oct 2007 21:50:14 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	David Miller <davem@...emloft.net>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH]: Fix IDE host_flags regression.

Hi,

Thanks for debugging & fixing this.

On Monday 22 October 2007, David Miller wrote:
> 
> Bart, please test your changes.

Well, I do.  However due to hardware diversity it is not practically
possible to test them all myself...

> Thank you.
> 
> [IDE]: Expand hwif->host_flags so that it fits new flags.
> 
> This fixes regressions added by:
> 238e4f142c33bb34440cc64029dde7b9fbc4e65f

Yeah, sorry for that.  ->host flags were expanded in struct ide_pci_device_s
(now struct ide_port_info) but not in struct hwif_s.  This went unnoticed
because majority of new flags are used only through struct ide_pci_device_s.

The exceptions are:
- IDE_HFLAG_NO_LBA48 (only user is trm290, exotic hardware)
- IDE_HFLAG_NO_LBA48_DMA (only user is alim15x3, revisions <= 0xC4)
- IDE_HFLAG_ERROR_STOPS_FIFO (the error path of pdc202xx_{old,new}) 

What worries me a bit is that commit 238e4f142c33bb34440cc64029dde7b9fbc4e65f
was in -mm since 2.6.23-rc4-mm1 (released on Sep 1 2007) and nobody reported
the issue earlier... 

> Signed-off-by: David S. Miller <davem@...emloft.net>
> 
> diff --git a/include/linux/ide.h b/include/linux/ide.h
> index 2e4b8dd..4ed4777 100644
> --- a/include/linux/ide.h
> +++ b/include/linux/ide.h
> @@ -667,7 +667,7 @@ typedef struct hwif_s {
>  	u8 straight8;	/* Alan's straight 8 check */
>  	u8 bus_state;	/* power state of the IDE bus */
>  
> -	u16 host_flags;
> +	u32 host_flags;
>  
>  	u8 pio_mask;
-
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