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| author | Minchan Kim <minchan@kernel.org> | 2013-01-30 02:41:39 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-02-04 01:52:49 (GMT) |
| commit | 7e5a5104c6af709a8d97d5f4711e7c917761d464 (patch) | |
| tree | 0813b4b28b95db4547daaa60757c144cc4a1a77f /drivers/memstick | |
| parent | 7f70410fe03f9f31a99bb5074b5e3c48f3b90541 (diff) | |
| download | linux-fsl-qoriq-7e5a5104c6af709a8d97d5f4711e7c917761d464.tar.xz | |
zram: Fix deadlock bug in partial read/write
Now zram allocates new page with GFP_KERNEL in zram I/O path
if IO is partial. Unfortunately, It may cause deadlock with
reclaim path like below.
write_page from fs
fs_lock
allocation(GFP_KERNEL)
reclaim
pageout
write_page from fs
fs_lock <-- deadlock
This patch fixes it by using GFP_NOIO. In read path, we
reorganize code flow so that kmap_atomic is called after the
GFP_NOIO allocation.
Cc: stable@vger.kernel.org
Acked-by: Jerome Marchand <jmarchand@redhat.com>
Acked-by: Nitin Gupta <ngupta@vflare.org>
[ penberg@kernel.org: don't use GFP_ATOMIC ]
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/memstick')
0 files changed, 0 insertions, 0 deletions