linux-kernel - [PATCH 11/12] spi : Use mutex instead of semaphore in driver core

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Message-ID: <20071229011858.GL2883@darkstar.te-china.tietoenator.com>
Date:	Sat, 29 Dec 2007 09:18:58 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	dbrownell@...rs.sourceforge.net
Cc:	linux-kernel@...r.kernel.org,
	spi-devel-general@...ts.sourceforge.net
Subject: [PATCH 11/12] spi : Use mutex instead of semaphore in driver core

Signed-off-by: Dave Young <hidave.darkstar@...il.com> 

---
drivers/spi/spi.c |    4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff -upr linux/drivers/spi/spi.c linux.new/drivers/spi/spi.c
--- linux/drivers/spi/spi.c	2007-12-28 10:47:38.000000000 +0800
+++ linux.new/drivers/spi/spi.c	2007-12-28 10:48:22.000000000 +0800
@@ -494,7 +494,7 @@ struct spi_master *spi_busnum_to_master(
 	struct spi_master	*master = NULL;
 	struct spi_master	*m;
 
-	down(&spi_master_class.sem);
+	mutex_lock(&spi_master_class.mutex);
 	list_for_each_entry(dev, &spi_master_class.children, node) {
 		m = container_of(dev, struct spi_master, dev);
 		if (m->bus_num == bus_num) {
@@ -502,7 +502,7 @@ struct spi_master *spi_busnum_to_master(
 			break;
 		}
 	}
-	up(&spi_master_class.sem);
+	mutex_unlock(&spi_master_class.mutex);
 	return master;
 }
 EXPORT_SYMBOL_GPL(spi_busnum_to_master);
--
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