linux-kernel - RE: [PATCH v3 4/4] hyperv-fb: kick off efifb early

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Date:	Mon, 24 Feb 2014 22:06:36 +0000
From:	Haiyang Zhang <haiyangz@...rosoft.com>
To:	Gerd Hoffmann <kraxel@...hat.com>,
	"linux-fbdev@...r.kernel.org" <linux-fbdev@...r.kernel.org>
CC:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	KY Srinivasan <kys@...rosoft.com>,
	"Abhishek Gupta (LIS)" <abgupta@...rosoft.com>,
	"jasowang@...hat.com" <jasowang@...hat.com>,
	"tomi.valkeinen@...com" <tomi.valkeinen@...com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Subject: RE: [PATCH v3 4/4] hyperv-fb: kick off efifb early



> -----Original Message-----
> From: Gerd Hoffmann [mailto:kraxel@...hat.com]
> Sent: Monday, February 24, 2014 8:17 AM
> To: linux-fbdev@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; gregkh@...uxfoundation.org; KY Srinivasan;
> Abhishek Gupta (LIS); Haiyang Zhang; jasowang@...hat.com;
> tomi.valkeinen@...com; devel@...uxdriverproject.org; Gerd Hoffmann; Jean-
> Christophe Plagniol-Villard
> Subject: [PATCH v3 4/4] hyperv-fb: kick off efifb early
> 
> Remove firmware framebuffer before initializing hyperv-fb.  Needed
> on gen2 virtual machines.   Letting register_framebuffer handle the
> switchover results in efifb still being active while hyperv graphics are
> initialized, which in turn can make the linux kernel hang.
> 
> Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
> ---
>  drivers/video/hyperv_fb.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/video/hyperv_fb.c b/drivers/video/hyperv_fb.c index
> 135d8cd..a570836 100644
> --- a/drivers/video/hyperv_fb.c
> +++ b/drivers/video/hyperv_fb.c
> @@ -683,6 +683,7 @@ static int hvfb_getmem(struct fb_info *info)
>  		info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
>  		info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
>  	}
> +	remove_conflicting_framebuffers(info->apertures, "hyperv-fb", false);

Please use KBUILD_MODNAME, so that the naming is consistent.

Thanks,
- Haiyang

> 
>  	info->fix.smem_start = par->mem.start;
>  	info->fix.smem_len = screen_fb_size;
> --
> 1.8.3.1

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