linux-kernel - Re: [PATCH] libata: PIIX3 support

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Date:	Wed, 10 Jan 2007 12:27:25 -0500
From:	Jeff Garzik <jgarzik@...ox.com>
To:	Alan <alan@...rguk.ukuu.org.uk>
CC:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] libata: PIIX3 support

Alan wrote:
> @@ -786,7 +797,8 @@
>  			    { 2, 3 }, };
>  
>  	pci_read_config_word(dev, master_port, &master_data);
> -	pci_read_config_byte(dev, 0x48, &udma_enable);
> +	if (ap->udma_mask)
> +		pci_read_config_byte(dev, 0x48, &udma_enable);
>  
>  	if (speed >= XFER_UDMA_0) {
>  		unsigned int udma = adev->dma_mode - XFER_UDMA_0;

This creates a situation where the code modifies an uninitialized 
variable.  Ultimately irrelevant, but please init udma_enable to zero so 
that at least it is valid C code.

Otherwise ACK.

	Jeff


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