async_tx: avoid the async xor_zero_sum path when src_cnt > device->ma…

…x_xor 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]>
jadonk · Mar 19, 2008 · 8d8002f · 8d8002f
1 parent f79abb6
commit 8d8002f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/crypto/async_tx/async_xor.c b/crypto/async_tx/async_xor.c
@@ -271,7 +271,7 @@ async_xor_zero_sum(struct page *dest, struct page **src_list,
 
 	BUG_ON(src_cnt <= 1);
 
-	if (device) {
+	if (device && src_cnt <= device->max_xor) {
 		dma_addr_t *dma_src = (dma_addr_t *) src_list;
 		unsigned long dma_prep_flags = cb_fn ? DMA_PREP_INTERRUPT : 0;
 		int i;