linux-kernel - Re: [PATCH] staging: usbip: Fix build on Debian ppc

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Message-ID: <CAPV97ye73kaP3+8MNRq=C7=SdsrDOXRHJQDhw0E0p=pLgPjgBg@mail.gmail.com>
Date:	Thu, 19 Sep 2013 16:58:34 +0530
From:	navin patidar <navinp@...c.in>
To:	Dominik Paulus <dominik@...aulus.de>
Cc:	Tobias Polzer <bulsa.t.polzer@...dium.uni-erlangen.de>,
	Anthony Foiani <anthony.foiani@...il.com>,
	devel@...verdev.osuosl.org, linux-kernel@...cs.fau.de,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	usbip-devel@...ts.sourceforge.net,
	Tobias Polzer <tobias.polzer@....de>,
	linux-kernel@...r.kernel.org,
	Dominik Paulus <dominik.paulus@....de>,
	Stefan Reif <ke42caxa@....cs.fau.de>, linux-usb@...r.kernel.org
Subject: Re: [PATCH] staging: usbip: Fix build on Debian ppc

On September 19, 2013 at 3:40 PM Dominik Paulus <dominik@...aulus.de> wrote:
> On Thu, Sep 19, 2013 at 12:12:44PM +0300, Dan Carpenter wrote:
> > On Thu, Sep 19, 2013 at 10:55:18AM +0200, Tobias Polzer wrote:
> > > When testing usbip under powerpc, it (unexpectedly) worked, but only after
> > > removing the following lines from vhch_hcd.c:
> > >
> > > 1004 /* will be removed */
> > > 1005 if (pdev->dev.dma_mask) {
> > > 1006 dev_info(&pdev->dev, "vhci_hcd DMA not supported\n");
> > > 1007 return -EINVAL;
> > > 1008 }
> > >
> > > We encountered no problems without those lines. Is it safe to remove this
> > > check?
> >
> > Hehe. No.
> >
> > Also which vhch_hcd.c are you talking about? "find -name vhch_hcd.c"
> > doesn't show anything.
>
> Sorry for the typo, we meant vhci_hcd.c in
> drivers/staging/usbip/vhci_hcd.c.
>
> > What the error message?
>
> When modprobing vhci_hcd.ko, vhci_hcd_probe() fails and returns -EINVAL,
> resulting in this error message:
>
> [ 592.623292] vhci_hcd vhci_hcd: vhci_hcd DMA not supported
> [ 592.624031] vhci_hcd: probe of vhci_hcd failed with error -22
>
> This leads to the virtual host controller device (vhci) not being
> created, so usbip cannot work.
> It works after removing the codeblock mentioned above.
>
> We did some research and discovered that dma_mask is only set on PowerPC
> at the moment (in arch/powerpc/kernel/setup-common.c,
> arch_setup_pdev_archdata()).
>
> All of our testing was done in QEMU emulating Debian on POWER7.
>

I have already submitted a patch to remove mentioned code block.
patch link : https://lkml.org/lkml/2013/9/10/26


regards,
--navin-patidar
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