linux-kernel - [PATCH] vgaarb: Stop complaining about absent devices

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Message-Id: <1431082028-18459-1-git-send-email-thierry.reding@gmail.com>
Date:	Fri,  8 May 2015 12:47:08 +0200
From:	Thierry Reding <thierry.reding@...il.com>
To:	David Airlie <airlied@...ux.ie>
Cc:	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH] vgaarb: Stop complaining about absent devices

From: Thierry Reding <treding@...dia.com>

Some setups do not register a default VGA device, in which case the VGA
arbiter will still complain about the (non-existent) PCI device being a
non-VGA device.

Fix this by making the error message conditional on a default VGA device
having been set up. Note that the easy route of erroring out early isn't
going to work because otherwise priv->target won't be properly updated.

Signed-off-by: Thierry Reding <treding@...dia.com>
---
 drivers/gpu/vga/vgaarb.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/vga/vgaarb.c b/drivers/gpu/vga/vgaarb.c
index 7bcbf863656e..3b1e65b3d454 100644
--- a/drivers/gpu/vga/vgaarb.c
+++ b/drivers/gpu/vga/vgaarb.c
@@ -1091,8 +1091,11 @@ static ssize_t vga_arb_write(struct file *file, const char __user * buf,
 		vgadev = vgadev_find(pdev);
 		pr_debug("vgaarb: vgadev %p\n", vgadev);
 		if (vgadev == NULL) {
-			pr_err("vgaarb: this pci device is not a vga device\n");
-			pci_dev_put(pdev);
+			if (pdev) {
+				pr_err("vgaarb: this pci device is not a vga device\n");
+				pci_dev_put(pdev);
+			}
+
 			ret_val = -ENODEV;
 			goto done;
 		}
-- 
2.3.5

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