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Subject[patch 73/76] async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor
-stable review patch.  If anyone has any objections, please let us know.
---------------------
From: Dan Williams <dan.j.williams@intel.com>

If the channel cannot perform the operation in one call to
->device_prep_dma_zero_sum, then fallback to the xor+page_is_zero path.
This only affects users with arrays larger than 16 devices on iop13xx or
32 devices on iop3xx.

Cc: <stable@kernel.org>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
[chrisw@sous-sol.org: backport to 2.6.24.3]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
please verify the backport makes sense
crypto/async_tx/async_xor.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/crypto/async_tx/async_xor.c
+++ b/crypto/async_tx/async_xor.c
@@ -264,7 +264,7 @@ async_xor_zero_sum(struct page *dest, st

BUG_ON(src_cnt <= 1);

- if (tx) {
+ if (tx && src_cnt <= device->max_xor) {
dma_addr_t dma_addr;
enum dma_data_direction dir;

--


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