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async_tx: use GFP_NOWAIT rather than GFP_IO

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These async_XX functions are called from md/raid5 in an atomic
section, between get_cpu() and put_cpu(), so they must not sleep.
So use GFP_NOWAIT rather than GFP_IO.

Dan Williams writes: Longer term async_tx needs to be merged into md
directly as we can allocate this unmap data statically per-stripe
rather than per request.

Fixed: 7476bd79fc ("async_pq: convert to dmaengine_unmap_data")
Cc: stable@vger.kernel.org (v3.13+)
Reported-and-tested-by: Stanislav Samsonov <slava@annapurnalabs.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
NeilBrown 2016-01-07 11:02:34 +11:00 • committed by Vinod Koul
commit b02bab6b0f
4 changed files with 7 additions and 7 deletions
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4
crypto/async_tx/async_pq.c
View file

@ -188,7 +188,7 @@ async_gen_syndrome(struct page **blocks, unsigned int offset, int disks,
BUG_ON(disks > 255 || !(P(blocks, disks) || Q(blocks, disks)));
if (device)
unmap = dmaengine_get_unmap_data(device->dev, disks, GFP_NOIO);
unmap = dmaengine_get_unmap_data(device->dev, disks, GFP_NOWAIT);
/* XORing P/Q is only implemented in software */
if (unmap && !(submit->flags & ASYNC_TX_PQ_XOR_DST) &&
@ -307,7 +307,7 @@ async_syndrome_val(struct page **blocks, unsigned int offset, int disks,
BUG_ON(disks < 4);
if (device)
unmap = dmaengine_get_unmap_data(device->dev, disks, GFP_NOIO);
unmap = dmaengine_get_unmap_data(device->dev, disks, GFP_NOWAIT);
if (unmap && disks <= dma_maxpq(device, 0) &&
is_dma_pq_aligned(device, offset, 0, len)) {