linux-kernel - [PATCH] isicom: Fix buffer allocation

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Message-ID: <20080429141733.607a2306@core>
Date:	Tue, 29 Apr 2008 14:17:33 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	akpm@...l.org, linux-kernel@...r.kernel.org
Subject: [PATCH] isicom: Fix buffer allocation

Fix the rather strange buffer management on open that turned up while
auditing for BKL dependancies

Signed-off-by: Alan Cox <alan@...hat.com>

diff -u --new-file --recursive --exclude-from /usr/src/exclude linux.vanilla-2.6.25-mm1/drivers/char/isicom.c linux-2.6.25-mm1/drivers/char/isicom.c
--- linux.vanilla-2.6.25-mm1/drivers/char/isicom.c	2008-04-28 11:36:48.000000000 +0100
+++ linux-2.6.25-mm1/drivers/char/isicom.c	2008-04-14 10:56:25.000000000 +0100
@@ -813,15 +813,13 @@
 		return 0;
 	if (!port->xmit_buf) {
 		/* Relies on BKL */
-		void *xmit_buf = (void *)get_zeroed_page(GFP_KERNEL);
-
-		if (xmit_buf == NULL)
+		unsigned long page  = get_zeroed_page(GFP_KERNEL);
+		if (page == 0)
 			return -ENOMEM;
-		if (port->xmit_buf) {
-			free_page((unsigned long)xmit_buf);
-			return -ERESTARTSYS;
-		}
-		port->xmit_buf = xmit_buf;
+		if (port->xmit_buf)
+			free_page(page);
+		else
+			port->xmit_buf = (unsigned char *) page;
 	}
 
 	spin_lock_irqsave(&card->card_lock, flags);
--
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