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dmaengine: at_xdmac: Drop locking in at_xdmac_alloc_chan_resources()

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There is no need for locking in device_alloc_chan_resources(),
the DMA core takes care of it by using a dma_list_mutex around
the DMA devices.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Link: https://lore.kernel.org/r/20200123140237.125799-8-tudor.ambarus@microchip.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Tudor Ambarus 2020-01-23 14:03:14 +00:00 committed by Vinod Koul
parent a443e98876
commit 387269d04b
1 changed files with 2 additions and 9 deletions
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11
drivers/dma/at_xdmac.c
View file

@ -1820,22 +1820,17 @@ static int at_xdmac_alloc_chan_resources(struct dma_chan *chan)
struct at_xdmac_chan *atchan = to_at_xdmac_chan(chan);
struct at_xdmac_desc *desc;
int i;
unsigned long flags;
spin_lock_irqsave(&atchan->lock, flags);
if (at_xdmac_chan_is_enabled(atchan)) {
dev_err(chan2dev(chan),
"can't allocate channel resources (channel enabled)\n");
i = -EIO;
goto spin_unlock;
return -EIO;
}
if (!list_empty(&atchan->free_descs_list)) {
dev_err(chan2dev(chan),
"can't allocate channel resources (channel not free from a previous use)\n");
i = -EIO;
goto spin_unlock;
return -EIO;
}
for (i = 0; i < init_nr_desc_per_channel; i++) {
@ -1852,8 +1847,6 @@ static int at_xdmac_alloc_chan_resources(struct dma_chan *chan)
dev_dbg(chan2dev(chan), "%s: allocated %d descriptors\n", __func__, i);
spin_unlock:
spin_unlock_irqrestore(&atchan->lock, flags);
return i;
}