linux-kernel - [PATCH 05/13] mmc: omap_hsmmc: Support for deferred probing when requesting DMA channels

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Date:	Tue, 26 May 2015 16:26:00 +0300
From:	Peter Ujfalusi <peter.ujfalusi@...com>
To:	<vinod.koul@...el.com>, <tony@...mide.com>
CC:	<devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<dan.j.williams@...el.com>, <dmaengine@...r.kernel.org>,
	<linux-serial@...r.kernel.org>, <linux-omap@...r.kernel.org>,
	<linux-mmc@...r.kernel.org>, <linux-crypto@...r.kernel.org>,
	<linux-spi@...r.kernel.org>, <linux-media@...r.kernel.org>,
	<alsa-devel@...a-project.org>, Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 05/13] mmc: omap_hsmmc: Support for deferred probing when requesting DMA channels

Switch to use ma_request_slave_channel_compat_reason() to request the DMA
channels. In case of error, return the error code we received including
-EPROBE_DEFER

Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>
CC: Ulf Hansson <ulf.hansson@...aro.org>
---
 drivers/mmc/host/omap_hsmmc.c | 22 ++++++++++------------
 1 file changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 57bb85930f81..d252478391ee 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -2088,23 +2088,21 @@ static int omap_hsmmc_probe(struct platform_device *pdev)
 	dma_cap_zero(mask);
 	dma_cap_set(DMA_SLAVE, mask);
 
-	host->rx_chan =
-		dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
-						 &rx_req, &pdev->dev, "rx");
+	host->rx_chan = dma_request_slave_channel_compat_reason(mask,
+				omap_dma_filter_fn, &rx_req, &pdev->dev, "rx");
 
-	if (!host->rx_chan) {
+	if (IS_ERR(host->rx_chan)) {
 		dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
-		ret = -ENXIO;
+		ret = PTR_ERR(host->rx_chan);
 		goto err_irq;
 	}
 
-	host->tx_chan =
-		dma_request_slave_channel_compat(mask, omap_dma_filter_fn,
-						 &tx_req, &pdev->dev, "tx");
+	host->tx_chan = dma_request_slave_channel_compat_reason(mask,
+				omap_dma_filter_fn, &tx_req, &pdev->dev, "tx");
 
-	if (!host->tx_chan) {
+	if (IS_ERR(host->tx_chan)) {
 		dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
-		ret = -ENXIO;
+		ret = PTR_ERR(host->tx_chan);
 		goto err_irq;
 	}
 
@@ -2166,9 +2164,9 @@ err_slot_name:
 	if (host->use_reg)
 		omap_hsmmc_reg_put(host);
 err_irq:
-	if (host->tx_chan)
+	if (!IS_ERR_OR_NULL(host->tx_chan))
 		dma_release_channel(host->tx_chan);
-	if (host->rx_chan)
+	if (!IS_ERR_OR_NULL(host->rx_chan))
 		dma_release_channel(host->rx_chan);
 	pm_runtime_put_sync(host->dev);
 	pm_runtime_disable(host->dev);
-- 
2.3.5

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