From: Linus Torvalds <torvalds@linux-foundation.org>
Date: Mon, 30 Mar 2009 18:31:47 +0000 (-0700)
Subject: Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6
X-Git-Url: http://www.pilppa.org/gitweb/gitweb.cgi?a=commitdiff_plain;h=2d25ee36c84d5b2d6be8bfaf80256ecad69a06ca;hp=915db32ddbc967f023fbf7d7f01cca9e05606a9b;p=linux-2.6-omap-h63xx.git

Merge branch 'bkl-removal' of git://git.lwn.net/linux-2.6

* 'bkl-removal' of git://git.lwn.net/linux-2.6:
  Fix a lockdep warning in fasync_helper()
  Add a missing unlock_kernel() in raw_open()
---

diff --git a/drivers/char/raw.c b/drivers/char/raw.c
index 96adf28a17e..20d90e6a6e5 100644
--- a/drivers/char/raw.c
+++ b/drivers/char/raw.c
@@ -90,6 +90,7 @@ out1:
 	blkdev_put(bdev, filp->f_mode);
 out:
 	mutex_unlock(&raw_mutex);
+	unlock_kernel();
 	return err;
 }
 
diff --git a/fs/fcntl.c b/fs/fcntl.c
index d865ca66ccb..cc8e4de2fee 100644
--- a/fs/fcntl.c
+++ b/fs/fcntl.c
@@ -531,6 +531,12 @@ int fasync_helper(int fd, struct file * filp, int on, struct fasync_struct **fap
 		if (!new)
 			return -ENOMEM;
 	}
+
+	/*
+	 * We need to take f_lock first since it's not an IRQ-safe
+	 * lock.
+	 */
+	spin_lock(&filp->f_lock);
 	write_lock_irq(&fasync_lock);
 	for (fp = fapp; (fa = *fp) != NULL; fp = &fa->fa_next) {
 		if (fa->fa_file == filp) {
@@ -555,14 +561,12 @@ int fasync_helper(int fd, struct file * filp, int on, struct fasync_struct **fap
 		result = 1;
 	}
 out:
-	/* Fix up FASYNC bit while still holding fasync_lock */
-	spin_lock(&filp->f_lock);
 	if (on)
 		filp->f_flags |= FASYNC;
 	else
 		filp->f_flags &= ~FASYNC;
-	spin_unlock(&filp->f_lock);
 	write_unlock_irq(&fasync_lock);
+	spin_unlock(&filp->f_lock);
 	return result;
 }
 
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 42436ae42f7..87e7bfc5ebd 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -849,7 +849,7 @@ struct file {
 #define f_dentry	f_path.dentry
 #define f_vfsmnt	f_path.mnt
 	const struct file_operations	*f_op;
-	spinlock_t		f_lock;  /* f_ep_links, f_flags */
+	spinlock_t		f_lock;  /* f_ep_links, f_flags, no IRQ */
 	atomic_long_t		f_count;
 	unsigned int 		f_flags;
 	fmode_t			f_mode;