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authorNeilBrown <neilb@suse.de>2015-03-16 02:44:52 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2015-03-16 23:51:20 +0300
commit7cff4b1836a9d3f18aadd6e88fd43055e2ff4132 (patch)
tree70647b3ffbae2a9534d7baae276d9e48da58605b
parent06e5801b8cb3fc057d88cb4dc03c0b64b2744cda (diff)
downloadlinux-7cff4b1836a9d3f18aadd6e88fd43055e2ff4132.tar.xz
kernfs: handle poll correctly on 'direct_read' files.
Kernfs supports two styles of read: direct_read and seqfile_read. The latter supports 'poll' correctly thanks to the update of '->event' in kernfs_seq_show. The former does not as '->event' is never updated on a read. So add an appropriate update in kernfs_file_direct_read(). This was noticed because some 'md' sysfs attributes were recently changed to use direct reads. Reported-by: Prakash Punnoor <prakash@punnoor.de> Reported-by: Torsten Kaiser <just.for.lkml@googlemail.com> Fixes: 750f199ee8b578062341e6ddfe36c59ac8ff2dcb Signed-off-by: NeilBrown <neilb@suse.de> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--fs/kernfs/file.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/fs/kernfs/file.c b/fs/kernfs/file.c
index b684e8a132e6..2bacb9988566 100644
--- a/fs/kernfs/file.c
+++ b/fs/kernfs/file.c
@@ -207,6 +207,7 @@ static ssize_t kernfs_file_direct_read(struct kernfs_open_file *of,
goto out_free;
}
+ of->event = atomic_read(&of->kn->attr.open->event);
ops = kernfs_ops(of->kn);
if (ops->read)
len = ops->read(of, buf, len, *ppos);