linux-kernel - [PATCH] hyperv-fb: kick off efifb early

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Message-Id: <1392993555-650-1-git-send-email-kraxel@redhat.com>
Date:	Fri, 21 Feb 2014 15:39:15 +0100
From:	Gerd Hoffmann <kraxel@...hat.com>
To:	linux-fbdev@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	kys@...rosoft.com, haiyangz@...rosoft.com, jasowang@...hat.com,
	Gerd Hoffmann <kraxel@...hat.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	devel@...uxdriverproject.org (open list:Hyper-V CORE AND...)
Subject: [PATCH] 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 f956cd9..3901ffe 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);
 
 	info->fix.smem_start = par->mem.start;
 	info->fix.smem_len = screen_fb_size;
-- 
1.8.3.1

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