diff options
| author | Peter Ujfalusi <peter.ujfalusi@ti.com> | 2018-07-18 12:29:57 +0300 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2018-07-25 15:34:15 +0300 |
| commit | ec8ca8e3b4809bf603814a8834bfd3891e1ccf74 (patch) | |
| tree | 61915f2e9f279563d3ff212c8ee4dbdef5edf017 /drivers/dma | |
| parent | d8095f94e19581057bcad35b8a725aa739e77595 (diff) | |
| download | linux-ec8ca8e3b4809bf603814a8834bfd3891e1ccf74.tar.xz | |
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.c | 10 |
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; } |