summaryrefslogtreecommitdiff
path: root/drivers/dma
diff options
context:
space:
mode:
authorPeter Ujfalusi <peter.ujfalusi@ti.com>2018-07-18 12:29:57 +0300
committerVinod Koul <vkoul@kernel.org>2018-07-25 18:04:15 +0530
commitec8ca8e3b4809bf603814a8834bfd3891e1ccf74 (patch)
tree61915f2e9f279563d3ff212c8ee4dbdef5edf017 /drivers/dma
parentd8095f94e19581057bcad35b8a725aa739e77595 (diff)
dmaengine: dma_request_chan_by_mask() to handle deferred probing
If there are no DMA devices registered yet, return with EPROBE_DEFER similarly to the case when requesting a slave channel. Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com> Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dmaengine.c10
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index 84ac38dbdb65..504420f213ff 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -770,8 +770,14 @@ struct dma_chan *dma_request_chan_by_mask(const dma_cap_mask_t *mask)
return ERR_PTR(-ENODEV);
chan = __dma_request_channel(mask, NULL, NULL);
- if (!chan)
- chan = ERR_PTR(-ENODEV);
+ if (!chan) {
+ mutex_lock(&dma_list_mutex);
+ if (list_empty(&dma_device_list))
+ chan = ERR_PTR(-EPROBE_DEFER);
+ else
+ chan = ERR_PTR(-ENODEV);
+ mutex_unlock(&dma_list_mutex);
+ }
return chan;
}