linux-kernel - Re: [PATCH] ide: motherboard-info based blacklist for ide-dma

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Message-ID: <4961266E.9000505@ru.mvista.com>
Date:	Mon, 05 Jan 2009 00:13:18 +0300
From:	Sergei Shtylyov <sshtylyov@...mvista.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	Kirill Smelkov <kirr@....spb.ru>, linux-ide@...r.kernel.org,
	linux-kernel@...r.kernel.org, kirr@...dau.phys.spbu.ru,
	Dmitry Gryazin <gdu@....spb.ru>
Subject: Re: [PATCH] ide: motherboard-info based blacklist for ide-dma

Hello, I wrote:

>>>>      drive->hwif->dma_ops->dma_host_set(drive, 1);
>>>>  }
>>>>  
>>>> +static int __ide_dma_bad_adaptor(ide_drive_t *drive)
>>>> +{
>>>> +    const struct board_blacklist_entry *table = board_blacklist;
>>>> +
>>>> +    const char *board_vendor = dmi_get_system_info(DMI_BOARD_VENDOR);
>>>> +    const char *board_name   = dmi_get_system_info(DMI_BOARD_NAME);
>>>> +
>>>> +    if (!board_vendor || !board_name)
>>>> +        return 0;
>>>> +
>>>> +    for ( ; table->board_name ; table++)
>>>> +        if ((!strcmp(board_vendor, table->board_vendor)) &&
>>>> +            (!strcmp(board_name,   table->board_name))   &&
>>>> +            (!strcmp(drive->name,  table->drive_name))) {
>>>> +            printk(KERN_WARNING "%s: Disabling (U)DMA for %s "
>>>> +                "(Board %s %s is blacklisted)\n", drive->name,
>>>> +                (char *)&drive->id[ATA_ID_PROD], board_vendor,
>>>> +                board_name);
>>>> +            return 1;
>>>> +        }
>>>> +
>>>> +    return 0;
>>>> +}
>>>> +
>>>>       
>>>     This code doesn't anyhow discriminate the case of on-board CF 
>>> and say     
> @@ -207,6 +222,30 @@ void ide_dma_on(ide_drive_t *drive)
>
>   Hm, previously I failed to notice that the patch tries to 
> discriminate this case based on applying the workaround only to the 
> drive with certain name ("hdc"). However, it still seems wrong to 
> place this workaround in __ide_dma_bad_drive() as it's not actually 
> connected to the deficiency of a specific drive but to the definciency 
> of the CF slot itself. Moreover, depending on the PCI cards plugged, 
> the drive's name may change...

   Oh, and the master/slave mode of the CF drive is selectable by 
on-board switch -- via the -CSEL signal I guess. :-)

MBR, Sergei


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