Commit 2382c148 authored by Krister Johansen's avatar Krister Johansen Committed by Greg Kroah-Hartman

dmaengine: iota: ioat_alloc_chan_resources should not perform sleeping allocations.

commit 21d25f6a upstream.

On a kernel with DEBUG_LOCKS, ioat_free_chan_resources triggers an
in_interrupt() warning.  With PROVE_LOCKING, it reports detecting a
SOFTIRQ-safe to SOFTIRQ-unsafe lock ordering in the same code path.

This is because dma_generic_alloc_coherent() checks if the GFP flags
permit blocking.  It allocates from different subsystems if blocking is
permitted.  The free path knows how to return the memory to the correct
allocator.  If GFP_KERNEL is specified then the alloc and free end up
going through cma_alloc(), which uses mutexes.

Given that ioat_free_chan_resources() can be called in interrupt
context, ioat_alloc_chan_resources() must specify GFP_NOWAIT so that the
allocations do not block and instead use an allocator that uses
spinlocks.
Signed-off-by: default avatarKrister Johansen <kjlx@templeofstupid.com>
Acked-by: default avatarDave Jiang <dave.jiang@intel.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 0e0f1d6f
......@@ -691,7 +691,7 @@ static int ioat_alloc_chan_resources(struct dma_chan *c)
/* doing 2 32bit writes to mmio since 1 64b write doesn't work */
ioat_chan->completion =
dma_pool_zalloc(ioat_chan->ioat_dma->completion_pool,
GFP_KERNEL, &ioat_chan->completion_dma);
GFP_NOWAIT, &ioat_chan->completion_dma);
if (!ioat_chan->completion)
return -ENOMEM;
......@@ -701,7 +701,7 @@ static int ioat_alloc_chan_resources(struct dma_chan *c)
ioat_chan->reg_base + IOAT_CHANCMP_OFFSET_HIGH);
order = IOAT_MAX_ORDER;
ring = ioat_alloc_ring(c, order, GFP_KERNEL);
ring = ioat_alloc_ring(c, order, GFP_NOWAIT);
if (!ring)
return -ENOMEM;
......
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