linux-kernel - [PATCH v5 2/2] hyperv-fb: kick off efifb early

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Date:	Wed, 26 Feb 2014 11:51:25 +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, abgupta@...rosoft.com, haiyangz@...rosoft.com,
	jasowang@...hat.com, tomi.valkeinen@...com,
	devel@...uxdriverproject.org, Gerd Hoffmann <kraxel@...hat.com>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>
Subject: [PATCH v5 2/2] 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 | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/video/hyperv_fb.c b/drivers/video/hyperv_fb.c
index b7b3dd0..e23392e 100644
--- a/drivers/video/hyperv_fb.c
+++ b/drivers/video/hyperv_fb.c
@@ -679,6 +679,8 @@ static int hvfb_getmem(struct fb_info *info)
 	if (gen2vm) {
 		info->apertures->ranges[0].base = screen_info.lfb_base;
 		info->apertures->ranges[0].size = screen_info.lfb_size;
+		remove_conflicting_framebuffers(info->apertures,
+						KBUILD_MODNAME, false);
 	} else {
 		info->apertures->ranges[0].base = pci_resource_start(pdev, 0);
 		info->apertures->ranges[0].size = pci_resource_len(pdev, 0);
-- 
1.8.3.1

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