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| author |   NeilBrown <neilb@suse.de> | 2015-03-16 10:44:52 +1100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-03-16 21:51:20 +0100 |
| commit | 7cff4b1836a9d3f18aadd6e88fd43055e2ff4132 (patch) | |
| tree | 70647b3ffbae2a9534d7baae276d9e48da58605b /fs | |
| parent | Linux 4.0-rc4 (diff) | |
| download | linux-dev-7cff4b1836a9d3f18aadd6e88fd43055e2ff4132.tar.xz linux-dev-7cff4b1836a9d3f18aadd6e88fd43055e2ff4132.zip | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/kernfs/file.c | 1 |
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); |