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| author | Dan Williams <dan.j.williams@intel.com> | 2007-07-20 00:31:46 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-20 08:44:19 -0700 |
| commit | eb0645a8b1f14da300f40bb9f424640cd1181fbf (patch) | |
| tree | 462789626fcd1775bec80d74d19bcd68797589c8 /drivers/md | |
| parent | 7c6129c68fe90a61166800b40217a850b8faee98 (diff) | |
| download | linux-eb0645a8b1f14da300f40bb9f424640cd1181fbf.tar.gz linux-eb0645a8b1f14da300f40bb9f424640cd1181fbf.tar.bz2 linux-eb0645a8b1f14da300f40bb9f424640cd1181fbf.zip | |
async_tx: fix kmap_atomic usage in async_memcpy
Andrew Morton:
[async_memcpy] is very wrong if both ASYNC_TX_KMAP_DST and
ASYNC_TX_KMAP_SRC can ever be set. We'll end up using the same kmap
slot for both src add dest and we get either corrupted data or a BUG.
Evgeniy Polyakov:
Btw, shouldn't it always be kmap_atomic() even if flag is not set.
That pages are usual one returned by alloc_page().
So fix the usage of kmap_atomic and kill the ASYNC_TX_KMAP_DST and
ASYNC_TX_KMAP_SRC flags.
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/md')
| -rw-r--r-- | drivers/md/raid5.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index c8dfdb302916..d90ee145effe 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -493,12 +493,12 @@ async_copy_data(int frombio, struct bio *bio, struct page *page, if (frombio) tx = async_memcpy(page, bio_page, page_offset, b_offset, clen, - ASYNC_TX_DEP_ACK | ASYNC_TX_KMAP_SRC, + ASYNC_TX_DEP_ACK, tx, NULL, NULL); else tx = async_memcpy(bio_page, page, b_offset, page_offset, clen, - ASYNC_TX_DEP_ACK | ASYNC_TX_KMAP_DST, + ASYNC_TX_DEP_ACK, tx, NULL, NULL); } if (clen < len) /* hit end of page */ |