| Date | Fri, 21 Mar 2008 15:44:03 -0700 | From | Chris Wright <> | Subject | [patch 73/76] async_tx: avoid the async xor_zero_sum path when src_cnt > device->max_xor |
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-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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