From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Date: Wed, 30 Apr 2008 07:54:17 +0000 (-0700)
Subject: isicom: fix buffer allocation
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=8cd64518a3d166a21f5c69ac7860b3add0369dd0;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

isicom: fix buffer allocation

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

Signed-off-by: Alan Cox <alan@redhat.com>
Cc: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 9c6be8da220c..4f3cefa8eb0e 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -813,15 +813,13 @@ static int isicom_setup_port(struct isi_port *port)
 		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);