From: Jean Tourrilhes <jt@hpl.hp.com>
Date: Sat, 16 Apr 2005 22:24:11 +0000 (-0700)
Subject: [PATCH] irda_device() oops fix
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7e5c6bc0a600c49e5922591ad41ff41987f54eb4;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git

[PATCH] irda_device() oops fix

Acked-by: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

diff --git a/net/irda/irda_device.c b/net/irda/irda_device.c
index fda299e300c..9b9bb003c5a 100644
--- a/net/irda/irda_device.c
+++ b/net/irda/irda_device.c
@@ -125,8 +125,15 @@ void irda_device_set_media_busy(struct net_device *dev, int status)
 
 	self = (struct irlap_cb *) dev->atalk_ptr;
 
-	IRDA_ASSERT(self != NULL, return;);
-	IRDA_ASSERT(self->magic == LAP_MAGIC, return;);
+	/* Some drivers may enable the receive interrupt before calling
+	 * irlap_open(), or they may disable the receive interrupt
+	 * after calling irlap_close().
+	 * The IrDA stack is protected from this in irlap_driver_rcv().
+	 * However, the driver calls directly the wrapper, that calls
+	 * us directly. Make sure we protect ourselves.
+	 * Jean II */
+	if (!self || self->magic != LAP_MAGIC)
+		return;
 
 	if (status) {
 		self->media_busy = TRUE;