From 04e8c7bc2c1eda2d06ff6eb57a7df97e64d895e6 Mon Sep 17 00:00:00 2001
From: Kevin Hilman <khilman@deeprootsystems.com>
Date: Wed, 11 Jul 2012 17:51:40 +0100
Subject: [PATCH] ARM: 7464/1: mmc: omap_hsmmc: ensure probe returns error if
DMA channel request fails
If dma_request_channel() fails (e.g. because DMA enine is not built
into the kernel), the return value from probe is zero causing the
driver to be bound to the device even though probe failed.
To fix, ensure that probe returns an error value when a DMA channel
request fail.
Signed-off-by: Kevin Hilman <khilman@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
drivers/mmc/host/omap_hsmmc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index 2338703746a49..823d21cb87c01 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -1924,12 +1924,14 @@ static int __devinit omap_hsmmc_probe(struct platform_device *pdev)
host->rx_chan = dma_request_channel(mask, omap_dma_filter_fn, &rx_req);
if (!host->rx_chan) {
dev_err(mmc_dev(host->mmc), "unable to obtain RX DMA engine channel %u\n", rx_req);
+ ret = -ENXIO;
goto err_irq;
}
host->tx_chan = dma_request_channel(mask, omap_dma_filter_fn, &tx_req);
if (!host->tx_chan) {
dev_err(mmc_dev(host->mmc), "unable to obtain TX DMA engine channel %u\n", tx_req);
+ ret = -ENXIO;
goto err_irq;
}
--
2.30.2