linux-kernel - Re: [PATCH 4/5] scsi: megaraid_sas - preallocate memory for ioctl processing

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Message-Id: <1170885734.3852.30.camel@mulgrave.il.steeleye.com>
Date:	Wed, 07 Feb 2007 17:02:13 -0500
From:	James Bottomley <James.Bottomley@...elEye.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Sumant Patro <sumantp@...l.com>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, neela.kolli@....com, bo.yang@....com,
	sumant.patro@....com
Subject: Re: [PATCH 4/5] scsi: megaraid_sas - preallocate memory for ioctl
	processing

On Wed, 2007-02-07 at 13:30 -0800, Andrew Morton wrote:
> I suspect all this horror is due to stupidity in the DMA API.
> 
> pci_alloc_consistent() just goes and assumes GFP_ATOMIC, whereas
> the caller (megasas_mgmt_fw_ioctl) would have been perfectly happy
> to use GFP_KERNEL.
> 
> I bet this fixes it

It does, but the DMA API was expanded to cope with this exact case, so
use dma_alloc_coherent() directly in the megaraid code instead.  The dev
is just &pci_dev->dev.

James


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