linux-kernel - Re: [PATCH] staging: sm750fb: avoid conflicting vesafb

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Date:   Fri, 4 Aug 2017 14:39:10 -0700
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Sudip Mukherjee <sudipm.mukherjee@...il.com>
Cc:     linux-kernel@...r.kernel.org,
        Teddy Wang <teddy.wang@...iconmotion.com>,
        stable@...r.kernel.org
Subject: Re: [PATCH] staging: sm750fb: avoid conflicting vesafb

On Sat, Jul 29, 2017 at 10:17:43PM +0100, Sudip Mukherjee wrote:
> From: Teddy Wang <teddy.wang@...iconmotion.com>
> 
> commit 740c433ec35187b45abe08bb6c45a321a791be8e upstream
> 
> If vesafb is enabled in the config then /dev/fb0 is created by vesa
> and this sm750 driver gets fb1, fb2. But we need to be fb0 and fb1 to
> effectively work with xorg.
> So if it has been alloted fb1, then try to remove the other fb0.
> 
> In the previous send, why #ifdef is used was asked.
> https://lkml.org/lkml/2017/6/25/57
> 
> Answered at: https://lkml.org/lkml/2017/6/25/69
> Also pasting here for reference.
> 
> 'Did a quick research into "why".
> The patch d8801e4df91e ("x86/PCI: Set IORESOURCE_ROM_SHADOW only for the
> default VGA device") has started setting IORESOURCE_ROM_SHADOW in flags
> for a default VGA device and that is being done only for x86.
> And so, we will need that #ifdef to check IORESOURCE_ROM_SHADOW as that
> needs to be checked only for a x86 and not for other arch.'
> 
> Cc: <stable@...r.kernel.org> # v4.4
> Signed-off-by: Teddy Wang <teddy.wang@...iconmotion.com>
> Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@...il.com>
> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> ---
>  drivers/staging/sm750fb/sm750.c | 24 ++++++++++++++++++++++++
>  1 file changed, 24 insertions(+)
> 
> diff --git a/drivers/staging/sm750fb/sm750.c b/drivers/staging/sm750fb/sm750.c
> index 860e1c2..2a89dc2 100644
> --- a/drivers/staging/sm750fb/sm750.c
> +++ b/drivers/staging/sm750fb/sm750.c
> @@ -1002,6 +1002,26 @@ NO_PARAM:
>  	}
>  }
>  
> +static int lynxfb_kick_out_firmware_fb(struct pci_dev *pdev)
> +{
> +	struct apertures_struct *ap;
> +	bool primary = false;
> +
> +	ap = alloc_apertures(1);
> +	if (!ap)
> +		return -ENOMEM;
> +
> +	ap->ranges[0].base = pci_resource_start(pdev, 0);
> +	ap->ranges[0].size = pci_resource_len(pdev, 0);
> +#ifdef CONFIG_X86
> +	primary = pdev->resource[PCI_ROM_RESOURCE].flags &
> +					IORESOURCE_ROM_SHADOW;
> +#endif
> +	remove_conflicting_framebuffers(ap, "sm750_fb1", primary);
> +	kfree(ap);
> +	return 0;
> +}
> +
>  static int lynxfb_pci_probe(struct pci_dev *pdev,
>  			    const struct pci_device_id *ent)
>  {
> @@ -1009,6 +1029,10 @@ static int lynxfb_pci_probe(struct pci_dev *pdev,
>  	struct sm750_dev *sm750_dev = NULL;
>  	int fbidx;
>  
> +	err = lynxfb_kick_out_firmware_fb(pdev);
> +	if (err)
> +		return err;
> +

This breaks the build, so I have to drop it.  Please be more careful :(

greg k-h