linux-kernel - [PATCH] viafb: fix ioremap

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Message-Id: <1250279276-3936-1-git-send-email-FlorianSchandinat@gmx.de>
Date:	Fri, 14 Aug 2009 19:47:56 +0000
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	linux-fbdev-devel@...ts.sourceforge.net, akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, JosephChan@....com.tw,
	ScottFang@...tech.com.cn,
	Florian Tobias Schandinat <FlorianSchandinat@....de>
Subject: [PATCH] viafb: fix ioremap_nocache error handling

viafb: fix ioremap_nocache error handling

Correct the returned error code for remapping the video framebuffer.
Introduce error handling for remapping MMIO register address space to
avoid a NULL pointer dereference. Disable hardware acceleration if
remapping MMIO register address space failed as those registers are only
used for hardware acceleration.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@....de>
---
 viafbdev.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/drivers/video/via/viafbdev.c b/drivers/video/via/viafbdev.c
index 743eed4..72759b6 100644
--- a/drivers/video/via/viafbdev.c
+++ b/drivers/video/via/viafbdev.c
@@ -2134,12 +2134,16 @@ static int __devinit via_pci_probe(void)
 
 	if (!viaparinfo->fbmem_virt) {
 		printk(KERN_INFO "ioremap failed\n");
-		return -1;
+		return -ENOMEM;
 	}
 
 	viafb_get_mmio_info(&viaparinfo->mmio_base, &viaparinfo->mmio_len);
 	viaparinfo->io_virt = ioremap_nocache(viaparinfo->mmio_base,
 		viaparinfo->mmio_len);
+	if (!viaparinfo->io_virt) {
+		printk(KERN_WARNING "ioremap failed: hardware acceleration disabled\n");
+		viafb_accel = 0;
+	}
 
 	viafbinfo->node = 0;
 	viafbinfo->fbops = &viafb_ops;
-- 
1.6.3.2

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