diff options
| author | Tudor Ambarus <tudor.ambarus@microchip.com> | 2020-01-23 14:03:14 +0000 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2020-02-25 11:27:27 +0530 |
| commit | 387269d04b3d6f76a3a6efd4fb66fa31c12e2508 (patch) | |
| tree | fbe52ffecab14f392c46a86155d37d30227cefb6 | |
| parent | a443e988765b7cdaf9ffa0f3d2d3d9b532668e5d (diff) | |
dmaengine: at_xdmac: Drop locking in at_xdmac_alloc_chan_resources()
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>
| -rw-r--r-- | drivers/dma/at_xdmac.c | 11 |
1 files changed, 2 insertions, 9 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index 3d6e84def7a6..8fb01bc90ba7 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -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; } |