linux-kernel - Re: [PATCH 2/2] USB: ehci: tegra: Align DMA transfers to 32 bytes

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Message-Id: <201012192257.48704.oliver@neukum.org>
Date:	Sun, 19 Dec 2010 22:57:48 +0100
From:	Oliver Neukum <oliver@...kum.org>
To:	Robert Morell <rmorell@...dia.com>
Cc:	David Brownell <dbrownell@...rs.sourceforge.net>,
	"Greg Kroah-Hartman" <gregkh@...e.de>,
	Benoit Goby <benoit@...roid.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Sarah Sharp <sarah.a.sharp@...ux.intel.com>,
	Matthew Wilcox <willy@...ux.intel.com>,
	Ming Lei <tom.leiming@...il.com>,
	Jacob Pan <jacob.jun.pan@...el.com>,
	Olof Johansson <olof@...om.net>,
	Erik Gilling <konkers@...roid.com>,
	Colin Cross <ccross@...roid.com>, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-tegra@...r.kernel.org
Subject: Re: [PATCH 2/2] USB: ehci: tegra: Align DMA transfers to 32 bytes

Am Sonntag, 19. Dezember 2010, 22:38:18 schrieb Robert Morell:
> +static int tegra_ehci_map_urb_for_dma(struct usb_hcd *hcd, struct urb *urb,
> +                                     gfp_t mem_flags)
> +{
> +       int ret;
> +
> +       ret = alloc_temp_buffer(urb, mem_flags);
> +       if (ret)
> +               return ret;
> +
> +       ret = usb_hcd_map_urb_for_dma(hcd, urb, mem_flags);
> +       if (ret)
> +               free_temp_buffer(urb);

Using free_temp_buffer() in the error case looks like a bad
idea, as you'd execute the memcpy if the direction tells you to.

	Regards
		Oliver
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