From: Jonathan Corbet <corbet@lwn.net>
Date: Fri, 16 May 2008 19:46:14 +0000 (-0600)
Subject: spidev: BKL pushdown
X-Git-Tag: v2.6.27-rc1~1103^2~107
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=609f9e92b570f390a457a81effe0af6b758dc582;p=linux-2.6

spidev: BKL pushdown

Add the BKL to spidev_open(), even though the existing locking looks
adequate.

Signed-off-by: Jonathan Corbet <corbet@lwn.net>
---

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index b3518ca9f0..ab2b769c83 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -29,6 +29,7 @@
 #include <linux/errno.h>
 #include <linux/mutex.h>
 #include <linux/slab.h>
+#include <linux/smp_lock.h>
 
 #include <linux/spi/spi.h>
 #include <linux/spi/spidev.h>
@@ -393,6 +394,7 @@ static int spidev_open(struct inode *inode, struct file *filp)
 	struct spidev_data	*spidev;
 	int			status = -ENXIO;
 
+	lock_kernel();
 	mutex_lock(&device_list_lock);
 
 	list_for_each_entry(spidev, &device_list, device_entry) {
@@ -418,6 +420,7 @@ static int spidev_open(struct inode *inode, struct file *filp)
 		pr_debug("spidev: nothing for minor %d\n", iminor(inode));
 
 	mutex_unlock(&device_list_lock);
+	unlock_kernel();
 	return status;
 }