* dmaengine: dma_request_chan_by_mask() to handle deferred probing
@ 2018-07-25 12:34 Vinod Koul
0 siblings, 0 replies; 2+ messages in thread
From: Vinod Koul @ 2018-07-25 12:34 UTC (permalink / raw)
To: Peter Ujfalusi; +Cc: dan.j.williams, dmaengine, linux-kernel
On 18-07-18, 12:29, Peter Ujfalusi wrote:
> If there are no DMA devices registered yet, return with EPROBE_DEFER
> similarly to the case when requesting a slave channel.
Applied, thanks
^ permalink raw reply [flat|nested] 2+ messages in thread
* dmaengine: dma_request_chan_by_mask() to handle deferred probing
@ 2018-07-18 9:29 Peter Ujfalusi
0 siblings, 0 replies; 2+ messages in thread
From: Peter Ujfalusi @ 2018-07-18 9:29 UTC (permalink / raw)
To: vkoul, dan.j.williams; +Cc: dmaengine, linux-kernel
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>
---
drivers/dma/dmaengine.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c
index d8fc7b58e506..f62e59e1a264 100644
--- a/drivers/dma/dmaengine.c
+++ b/drivers/dma/dmaengine.c
@@ -768,8 +768,14 @@ 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;
}
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