linux-kernel - Re: [PATCH] [OOPS] apbuart.c: Two problems related to grlib_apbuart

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Date:	Tue, 11 May 2010 15:38:04 +0200
From:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To:	kristoffer@...sler.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] [OOPS] apbuart.c: Two problems related to
 grlib_apbuart_configure()

Hi,

Kristoffer, please check this one instead.

Changes:
1. Added the grlib_apbuart_port_nr = 0 line.
2. Returned -ENODEV instead of 0 in the "no ports found branch" in
init(), because if compiled as a module, exit() will try to unregister
things that were not registered. In addition, this will alert the users
that modprobe'd.
3. Deleted the unused __FILE__ argument of the previous patch (oops
sorry :).

Andrew, if Kristoffer agrees, please drop the older patch from -mm and
merge this one instead.

Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
---
--- drivers/serial/apbuart.c.orig	2010-04-26 16:48:30.000000000 +0200
+++ drivers/serial/apbuart.c	2010-05-11 15:21:28.984666230 +0200
@@ -525,6 +525,9 @@ static void grlib_apbuart_configure(void
 static int __init apbuart_console_init(void)
 {
 	grlib_apbuart_configure();
+	if (grlib_apbuart_port_nr == 0)
+		return 0;
+
 	register_console(&grlib_apbuart_console);
 	return 0;
 }
@@ -612,6 +615,10 @@ static void grlib_apbuart_configure(void
 	rp = of_find_node_by_path("/");
 	rp = of_get_next_child(rp, NULL);
 	prop = of_get_property(rp, "clock-frequency", NULL);
+	if (prop == NULL) {
+		grlib_apbuart_port_nr = 0;
+		return;
+	}
 	freq_khz = *prop;
 
 	line = 0;
@@ -666,6 +673,10 @@ static int __init grlib_apbuart_init(voi
 
 	/* Find all APBUARTS in device the tree and initialize their ports */
 	grlib_apbuart_configure();
+	if (grlib_apbuart_port_nr == 0) {
+		printk(KERN_INFO "Serial: GRLIB APBUART: No ports found.\n");
+		return -ENODEV;
+	}
 
 	printk(KERN_INFO "Serial: GRLIB APBUART driver\n");
 

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