From: Miklos Szeredi <mszeredi@suse.cz>
Date: Mon, 7 Jul 2014 13:28:51 +0000 (+0200)
Subject: fuse: avoid scheduling while atomic
X-Git-Tag: omap-for-v3.17/fixes-against-rc2~288^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=c55a01d360afafcd52bc405c044a6ebf5de436d5;p=pandora-kernel.git

fuse: avoid scheduling while atomic

As reported by Richard Sharpe, an attempt to use fuse_notify_inval_entry()
triggers complains about scheduling while atomic:

  BUG: scheduling while atomic: fuse.hf/13976/0x10000001

This happens because fuse_notify_inval_entry() attempts to allocate memory
with GFP_KERNEL, holding "struct fuse_copy_state" mapped by kmap_atomic().

Introduced by commit 58bda1da4b3c "fuse/dev: use atomic maps"

Fix by moving the map/unmap to just cover the actual memcpy operation.

Original patch from Maxim Patlasov <mpatlasov@parallels.com>

Reported-by: Richard Sharpe <realrichardsharpe@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Cc: <stable@vger.kernel.org> # v3.15+
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