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authorAlan Stern <stern@rowland.harvard.edu>2007-03-15 15:51:28 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-15 15:29:26 -0700
commite7b0d26a86943370c04d6833c6edba2a72a6e240 (patch)
tree696e696176a1e72abb80afa6112fc057b39bf86b /fs/sysfs/file.c
parentd9a9cdfb078d755e648d53ec25b7370f84ee5729 (diff)
[PATCH] sysfs: reinstate exclusion between method calls and attribute unregistration
This patch (as869) reinstates the mutual exclusion between sysfs attribute method calls and attribute unregistration. The previously-reported deadlocks have been fixed, and this exclusion is by far the simplest way to avoid races during driver unbinding. The check for orphaned read-buffers has been moved down slightly, so that the remainder of a partially-read buffer will still be available to userspace even after the attribute has been unregistered. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: Hugh Dickins <hugh@veritas.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Oliver Neukum <oneukum@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/sysfs/file.c')
-rw-r--r--fs/sysfs/file.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/sysfs/file.c b/fs/sysfs/file.c
index 1bafdf6e171c..fc4633378dc0 100644
--- a/fs/sysfs/file.c
+++ b/fs/sysfs/file.c
@@ -168,12 +168,12 @@ sysfs_read_file(struct file *file, char __user *buf, size_t count, loff_t *ppos)
ssize_t retval = 0;
down(&buffer->sem);
- if (buffer->orphaned) {
- retval = -ENODEV;
- goto out;
- }
if (buffer->needs_read_fill) {
- if ((retval = fill_read_buffer(file->f_path.dentry,buffer)))
+ if (buffer->orphaned)
+ retval = -ENODEV;
+ else
+ retval = fill_read_buffer(file->f_path.dentry,buffer);
+ if (retval)
goto out;
}
pr_debug("%s: count = %zd, ppos = %lld, buf = %s\n",