mm/zswap.c: fix two bugs in zswap_writeback_entry()

In the ZSWAP_SWAPCACHE_FAIL and ZSWAP_SWAPCACHE_EXIST case, we forgot to
call zpool_unmap_handle() when zpool can't sleep. And we might sleep in
zswap_get_swap_cache_page() while zpool can't sleep. To fix all of these,
zpool_unmap_handle() should be done before zswap_get_swap_cache_page()
when zpool can't sleep.

Link: https://lkml.kernel.org/r/[email protected]
Fixes: fc6697a89f56 ("mm/zswap: add the flag can_sleep_mapped")
Signed-off-by: Miaohe Lin <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Dan Streetman <[email protected]>
Cc: Nathan Chancellor <[email protected]>
Cc: Sebastian Andrzej Siewior <[email protected]>
Cc: Seth Jennings <[email protected]>
Cc: Tian Tao <[email protected]>
Cc: Vitaly Wool <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

0 files changed, 0 insertions, 0 deletions