commit 5d51c29a9ccf12c169c13d155a22b5e683280604
Author: Dan Williams <[EMAIL PROTECTED]>
Date: Wed Mar 19 04:40:04 2008 +0000
async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor
commit: 8d8002f642886ae256a3c5d70fe8aff4faf3631a
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: <[EMAIL PROTECTED]>
Cc: Neil Brown <[EMAIL PROTECTED]>
Signed-off-by: Dan Williams <[EMAIL PROTECTED]>
[EMAIL PROTECTED]: backport to 2.6.24.3]
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
Signed-off-by: Greg Kroah-Hartman <[EMAIL PROTECTED]>
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
index 2575f67..5c579d2 100644
--- 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, struct page
**src_list,
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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