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Subject[PATCH 04/12] BKL: Remove BKL from autofs4
Date
autofs4 uses the BKL only to guard its ioctl operations.
This can be trivially converted to use a mutex, as we have
done with most device drivers before.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
---
fs/autofs4/root.c | 12 +++++++-----
1 files changed, 7 insertions(+), 5 deletions(-)
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index cb1bd38..9dd29c2 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -19,7 +19,7 @@
#include <linux/param.h>
#include <linux/time.h>
#include <linux/compat.h>
-#include <linux/smp_lock.h>
+#include <linux/mutex.h>

#include "autofs_i.h"

@@ -978,15 +978,17 @@ static int autofs4_root_ioctl_unlocked(struct inode *inode, struct file *filp,
}
}

+static DEFINE_MUTEX(autofs4_ioctl_mutex);
+
static long autofs4_root_ioctl(struct file *filp,
unsigned int cmd, unsigned long arg)
{
long ret;
struct inode *inode = filp->f_dentry->d_inode;

- lock_kernel();
+ mutex_lock(&autofs4_ioctl_mutex);
ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
- unlock_kernel();
+ mutex_unlock(&autofs4_ioctl_mutex);

return ret;
}
@@ -998,13 +1000,13 @@ static long autofs4_root_compat_ioctl(struct file *filp,
struct inode *inode = filp->f_path.dentry->d_inode;
int ret;

- lock_kernel();
+ mutex_lock(&autofs4_ioctl_mutex);
if (cmd == AUTOFS_IOC_READY || cmd == AUTOFS_IOC_FAIL)
ret = autofs4_root_ioctl_unlocked(inode, filp, cmd, arg);
else
ret = autofs4_root_ioctl_unlocked(inode, filp, cmd,
(unsigned long)compat_ptr(arg));
- unlock_kernel();
+ mutex_unlock(&autofs4_ioctl_mutex);

return ret;
}
--
1.7.1


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