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dmaengine: at_hdmac: Switch atomic allocations to GFP_NOWAIT 

Avoids sleeping without depleting the emergency pool.
The rationale being that in most cases a dma device is either
offloading an operation that will automatically fallback to
software when the descriptor allocation fails, or we can simply poll
and wait for the dma device to release some in use descriptors.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Link: https://lore.kernel.org/r/20200123140237.125799-5-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
alistair/sensors
Tudor Ambarus 2020-01-23 14:03:09 +00:00 committed by Vinod Koul
parent ceb2c14c59
commit 247b4d83d6
1 changed files with 3 additions and 3 deletions
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6
drivers/dma/at_hdmac.c
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@ -147,7 +147,7 @@ static struct at_desc *atc_desc_get(struct at_dma_chan *atchan)
/* no more descriptor available in initial pool: create one more */
if (!ret)
ret = atc_alloc_descriptor(&atchan->chan_common, GFP_ATOMIC);
ret = atc_alloc_descriptor(&atchan->chan_common, GFP_NOWAIT);
return ret;
}
@ -931,7 +931,7 @@ atc_prep_dma_memset(struct dma_chan *chan, dma_addr_t dest, int value,
return NULL;
}
vaddr = dma_pool_alloc(atdma->memset_pool, GFP_ATOMIC, &paddr);
vaddr = dma_pool_alloc(atdma->memset_pool, GFP_NOWAIT, &paddr);
if (!vaddr) {
dev_err(chan2dev(chan), "%s: couldn't allocate buffer\n",
__func__);
@ -989,7 +989,7 @@ atc_prep_dma_memset_sg(struct dma_chan *chan,
return NULL;
}
vaddr = dma_pool_alloc(atdma->memset_pool, GFP_ATOMIC, &paddr);
vaddr = dma_pool_alloc(atdma->memset_pool, GFP_NOWAIT, &paddr);
if (!vaddr) {
dev_err(chan2dev(chan), "%s: couldn't allocate buffer\n",
__func__);