linux-kernel - [PATCH] uvesafb: don't treat mode info retrieval failures as errors

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Date:	Sun, 21 Sep 2008 22:45:42 +0200
From:	Michal Januszewski <spock@...too.org>
To:	linux-kernel@...r.kernel.org
Cc:	linux-fbdev-devel@...ts.sourceforge.net
Subject: [PATCH] uvesafb: don't treat mode info retrieval failures as errors

From: Michal Januszewski <spock@...too.org>

Some BIOSes return error codes when queried for information about
modes from their own modelist.  uvesafb treats this as an error
case and bails out.

Change this behavior so that broken modes do not prevent the driver
from working.  Only the failure to retrieve information about any
usable video mode is considered to be an error case.

Signed-off-by: Michal Januszewski <spock@...too.org>
---
diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c
index 5074422..6c2d37f 100644
--- a/drivers/video/uvesafb.c
+++ b/drivers/video/uvesafb.c
@@ -516,10 +516,12 @@ static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 
 		err = uvesafb_exec(task);
 		if (err || (task->t.regs.eax & 0xffff) != 0x004f) {
-			printk(KERN_ERR "uvesafb: Getting mode info block "
+			printk(KERN_WARNING "uvesafb: Getting mode info block "
 				"for mode 0x%x failed (eax=0x%x, err=%d)\n",
 				*mode, (u32)task->t.regs.eax, err);
-			return -EINVAL;
+			mode++;
+			par->vbe_modes_cnt--;
+			continue;
 		}
 
 		mib = task->buf;
@@ -548,7 +550,10 @@ static int __devinit uvesafb_vbe_getmodes(struct uvesafb_ktask *task,
 			mib->depth = mib->bits_per_pixel;
 	}
 
-	return 0;
+	if (par->vbe_modes_cnt > 0)
+		return 0;
+	else
+		return -EINVAL;
 }
 
 /*

--
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