linux-kernel - Re: [PATCH] drivers/pcmcia/soc_common.c: convert soc_pcmcia_sockets

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Date:	Fri, 7 Mar 2008 11:16:42 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Matthias Kaehlcke <matthias@...hlcke.net>
Cc:	linux-pcmcia@...ts.infradead.org, nico@....org,
	rmk@....linux.org.uk, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers/pcmcia/soc_common.c: convert
 soc_pcmcia_sockets_lock in a mutex

On Fri, 7 Mar 2008 19:37:42 +0100 Matthias Kaehlcke <matthias@...hlcke.net> wrote:

> drivers/pcmcia/soc_common.c: the semaphore soc_pcmcia_sockets_lock is
> used as a mutex, convert it to the mutex API
> 

I did this yesterday, when I saw it while grepping around due to your other
patch;)

>  LIST_HEAD(soc_pcmcia_sockets);
> -DECLARE_MUTEX(soc_pcmcia_sockets_lock);
> +DEFINE_MUTEX(soc_pcmcia_sockets_lock);

I made this static.

> -extern struct semaphore soc_pcmcia_sockets_lock;
> +extern struct mutex soc_pcmcia_sockets_lock;

And deleted this.


 drivers/pcmcia/soc_common.c |   15 ++++++++-------
 drivers/pcmcia/soc_common.h |    1 -
 2 files changed, 8 insertions(+), 8 deletions(-)

diff -puN drivers/pcmcia/soc_common.c~drivers-pcmcia-soc_commonc-convert-soc_pcmcia_sockets_lock-into-a-mutex-and-make-it-static drivers/pcmcia/soc_common.c
--- a/drivers/pcmcia/soc_common.c~drivers-pcmcia-soc_commonc-convert-soc_pcmcia_sockets_lock-into-a-mutex-and-make-it-static
+++ a/drivers/pcmcia/soc_common.c
@@ -37,6 +37,7 @@
 #include <linux/kernel.h>
 #include <linux/timer.h>
 #include <linux/mm.h>
+#include <linux/mutex.h>
 #include <linux/interrupt.h>
 #include <linux/irq.h>
 #include <linux/spinlock.h>
@@ -578,7 +579,7 @@ EXPORT_SYMBOL(soc_pcmcia_enable_irqs);
 
 
 LIST_HEAD(soc_pcmcia_sockets);
-DECLARE_MUTEX(soc_pcmcia_sockets_lock);
+static DEFINE_MUTEX(soc_pcmcia_sockets_lock);
 
 static const char *skt_names[] = {
 	"PCMCIA socket 0",
@@ -601,11 +602,11 @@ soc_pcmcia_notifier(struct notifier_bloc
 	struct cpufreq_freqs *freqs = data;
 	int ret = 0;
 
-	down(&soc_pcmcia_sockets_lock);
+	mutex_lock(&soc_pcmcia_sockets_lock);
 	list_for_each_entry(skt, &soc_pcmcia_sockets, node)
 		if ( skt->ops->frequency_change )
 			ret += skt->ops->frequency_change(skt, val, freqs);
-	up(&soc_pcmcia_sockets_lock);
+	mutex_unlock(&soc_pcmcia_sockets_lock);
 
 	return ret;
 }
@@ -642,7 +643,7 @@ int soc_common_drv_pcmcia_probe(struct d
 	struct soc_pcmcia_socket *skt;
 	int ret, i;
 
-	down(&soc_pcmcia_sockets_lock);
+	mutex_lock(&soc_pcmcia_sockets_lock);
 
 	sinfo = kzalloc(SKT_DEV_INFO_SIZE(nr), GFP_KERNEL);
 	if (!sinfo) {
@@ -782,7 +783,7 @@ int soc_common_drv_pcmcia_probe(struct d
 	kfree(sinfo);
 
  out:
-	up(&soc_pcmcia_sockets_lock);
+	mutex_unlock(&soc_pcmcia_sockets_lock);
 	return ret;
 }
 
@@ -793,7 +794,7 @@ int soc_common_drv_pcmcia_remove(struct 
 
 	dev_set_drvdata(dev, NULL);
 
-	down(&soc_pcmcia_sockets_lock);
+	mutex_lock(&soc_pcmcia_sockets_lock);
 	for (i = 0; i < sinfo->nskt; i++) {
 		struct soc_pcmcia_socket *skt = &sinfo->skt[i];
 
@@ -818,7 +819,7 @@ int soc_common_drv_pcmcia_remove(struct 
 	if (list_empty(&soc_pcmcia_sockets))
 		soc_pcmcia_cpufreq_unregister();
 
-	up(&soc_pcmcia_sockets_lock);
+	mutex_unlock(&soc_pcmcia_sockets_lock);
 
 	kfree(sinfo);
 
diff -puN drivers/pcmcia/soc_common.h~drivers-pcmcia-soc_commonc-convert-soc_pcmcia_sockets_lock-into-a-mutex-and-make-it-static drivers/pcmcia/soc_common.h
--- a/drivers/pcmcia/soc_common.h~drivers-pcmcia-soc_commonc-convert-soc_pcmcia_sockets_lock-into-a-mutex-and-make-it-static
+++ a/drivers/pcmcia/soc_common.h
@@ -133,7 +133,6 @@ extern void soc_common_pcmcia_get_timing
 
 
 extern struct list_head soc_pcmcia_sockets;
-extern struct semaphore soc_pcmcia_sockets_lock;
 
 extern int soc_common_drv_pcmcia_probe(struct device *dev, struct pcmcia_low_level *ops, int first, int nr);
 extern int soc_common_drv_pcmcia_remove(struct device *dev);
_

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