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Date:	Fri, 18 Jul 2014 17:21:55 +0200
From:	Miklos Szeredi <>
To:	Seth Forshee <>
Cc:	Kernel Mailing List <>,
	fuse-devel <>,,
	"Eric W. Biederman" <>,
	Serge Hallyn <>,
	"Michael H. Warfield" <>
Subject: Re: [PATCH 1/3] fuse/dev: Fix unbalanced calls to kunmap_atomic()
 during splice I/O

On Mon, Jul 14, 2014 at 9:18 PM, Seth Forshee
<> wrote:
> fuse_copy_finish() assumes that mapaddr in fuse_copy_state refers
> to a valid mapping if currbuf is non-NULL, but this isn't always
> true when moving pages for splice I/O. This results in an
> unbalanced call to kunmap_atomic() and thus an unbalanced
> decrement of the preempt count. Avoid this by checking that
> mapaddr is non-NULL before calling kunmap_atomic().

I guess this is obsoleted by:

  c55a01d360af  fuse: avoid scheduling while atomic

which moves the kmap/kunmap closer to the actual use of the mapping.

Can you please verify?

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