linux-kernel - [PATCH AUTOSEL 4.4 2/4] drm/bochs: downgrade pci_request

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Message-Id: <20200326232535.8460-2-sashal@kernel.org>
Date:   Thu, 26 Mar 2020 19:25:33 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Gerd Hoffmann <kraxel@...hat.com>,
        Marek Marczykowski-Górecki 
        <marmarek@...isiblethingslab.com>, Sam Ravnborg <sam@...nborg.org>,
        Sasha Levin <sashal@...nel.org>,
        virtualization@...ts.linux-foundation.org,
        dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 4.4 2/4] drm/bochs: downgrade pci_request_region failure from error to warning

From: Gerd Hoffmann <kraxel@...hat.com>

[ Upstream commit 8c34cd1a7f089dc03933289c5d4a4d1489549828 ]

Shutdown of firmware framebuffer has a bunch of problems.  Because
of this the framebuffer region might still be reserved even after
drm_fb_helper_remove_conflicting_pci_framebuffers() returned.

Don't consider pci_request_region() failure for the framebuffer
region as fatal error to workaround this issue.

Reported-by: Marek Marczykowski-Górecki <marmarek@...isiblethingslab.com>
Signed-off-by: Gerd Hoffmann <kraxel@...hat.com>
Acked-by: Sam Ravnborg <sam@...nborg.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20200313084152.2734-1-kraxel@redhat.com
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/bochs/bochs_hw.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/bochs/bochs_hw.c b/drivers/gpu/drm/bochs/bochs_hw.c
index a39b0343c197d..401c218567af9 100644
--- a/drivers/gpu/drm/bochs/bochs_hw.c
+++ b/drivers/gpu/drm/bochs/bochs_hw.c
@@ -97,10 +97,8 @@ int bochs_hw_init(struct drm_device *dev, uint32_t flags)
 		size = min(size, mem);
 	}
 
-	if (pci_request_region(pdev, 0, "bochs-drm") != 0) {
-		DRM_ERROR("Cannot request framebuffer\n");
-		return -EBUSY;
-	}
+	if (pci_request_region(pdev, 0, "bochs-drm") != 0)
+		DRM_WARN("Cannot request framebuffer, boot fb still active?\n");
 
 	bochs->fb_map = ioremap(addr, size);
 	if (bochs->fb_map == NULL) {
-- 
2.20.1