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authorDan Williams <dan.j.williams@intel.com>2007-07-20 00:31:46 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-20 08:44:19 -0700
commiteb0645a8b1f14da300f40bb9f424640cd1181fbf (patch)
tree462789626fcd1775bec80d74d19bcd68797589c8 /crypto
parentdpt_i2o depends on virt_to_bus (diff)
downloadlinux-dev-eb0645a8b1f14da300f40bb9f424640cd1181fbf.tar.xz
linux-dev-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 'crypto')
-rw-r--r--crypto/async_tx/async_memcpy.c19
1 files changed, 4 insertions, 15 deletions
diff --git a/crypto/async_tx/async_memcpy.c b/crypto/async_tx/async_memcpy.c
index a973f4ef897d..047e533fcc5b 100644
--- a/crypto/async_tx/async_memcpy.c
+++ b/crypto/async_tx/async_memcpy.c
@@ -36,7 +36,6 @@
* @offset: offset in pages to start transaction
* @len: length in bytes
* @flags: ASYNC_TX_ASSUME_COHERENT, ASYNC_TX_ACK, ASYNC_TX_DEP_ACK,
- * ASYNC_TX_KMAP_SRC, ASYNC_TX_KMAP_DST
* @depend_tx: memcpy depends on the result of this transaction
* @cb_fn: function to call when the memcpy completes
* @cb_param: parameter to pass to the callback routine
@@ -88,23 +87,13 @@ async_memcpy(struct page *dest, struct page *src, unsigned int dest_offset,
__FUNCTION__);
}
- if (flags & ASYNC_TX_KMAP_DST)
- dest_buf = kmap_atomic(dest, KM_USER0) + dest_offset;
- else
- dest_buf = page_address(dest) + dest_offset;
-
- if (flags & ASYNC_TX_KMAP_SRC)
- src_buf = kmap_atomic(src, KM_USER0) + src_offset;
- else
- src_buf = page_address(src) + src_offset;
+ dest_buf = kmap_atomic(dest, KM_USER0) + dest_offset;
+ src_buf = kmap_atomic(src, KM_USER1) + src_offset;
memcpy(dest_buf, src_buf, len);
- if (flags & ASYNC_TX_KMAP_DST)
- kunmap_atomic(dest_buf, KM_USER0);
-
- if (flags & ASYNC_TX_KMAP_SRC)
- kunmap_atomic(src_buf, KM_USER0);
+ kunmap_atomic(dest_buf, KM_USER0);
+ kunmap_atomic(src_buf, KM_USER1);
async_tx_sync_epilog(flags, depend_tx, cb_fn, cb_param);
}