diff options
| author | Bence Csókás <csokas.bence@prolan.hu> | 2025-06-10 10:22:53 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2025-06-26 15:18:04 -0700 |
| commit | 08bf1663c21a3e815eda28fa242d84c945ca3b94 (patch) | |
| tree | 5aa3b75c0fb1151407c85ab1e23decc29099759f /drivers/dma | |
| parent | 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 (diff) | |
dmaengine: Add devm_dma_request_chan()
Expand the arsenal of devm functions for DMA devices, this time for
requesting channels.
Signed-off-by: Bence Csókás <csokas.bence@prolan.hu>
Link: https://lore.kernel.org/r/20250610082256.400492-2-csokas.bence@prolan.hu
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma')
| -rw-r--r-- | drivers/dma/dmaengine.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/dma/dmaengine.c b/drivers/dma/dmaengine.c index 758fcd0546d8..ca13cd39330b 100644 --- a/drivers/dma/dmaengine.c +++ b/drivers/dma/dmaengine.c @@ -926,6 +926,36 @@ void dma_release_channel(struct dma_chan *chan) } EXPORT_SYMBOL_GPL(dma_release_channel); +static void dmaenginem_release_channel(void *chan) +{ + dma_release_channel(chan); +} + +/** + * devm_dma_request_chan - try to allocate an exclusive slave channel + * @dev: pointer to client device structure + * @name: slave channel name + * + * Returns pointer to appropriate DMA channel on success or an error pointer. + * + * The operation is managed and will be undone on driver detach. + */ + +struct dma_chan *devm_dma_request_chan(struct device *dev, const char *name) +{ + struct dma_chan *chan = dma_request_chan(dev, name); + int ret = 0; + + if (!IS_ERR(chan)) + ret = devm_add_action_or_reset(dev, dmaenginem_release_channel, chan); + + if (ret) + return ERR_PTR(ret); + + return chan; +} +EXPORT_SYMBOL_GPL(devm_dma_request_chan); + /** * dmaengine_get - register interest in dma_channels */ |