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authorArnd Bergmann <arnd@arndb.de>2015-02-03 16:55:54 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2015-02-04 09:42:29 +0100
commit3981c516664d81a3e83c1923fa1ab3988c529402 (patch)
treec7c43a53c07d85fe91eabe9dc508b191e256df8b /drivers/mmc
parent4febb7e20aa619e2b2845519dad247e4038dc383 (diff)
downloadlinux-3981c516664d81a3e83c1923fa1ab3988c529402.tar.bz2
mmc: moxart: fix probe logic
Jonas Jensen wanted to submit a patch for these, but apparently forgot about it. I stumbled over this symptom first: drivers/built-in.o: In function `moxart_probe': :(.text+0x2af128): undefined reference to `of_dma_request_slave_channel' This is because of_dma_request_slave_channel is an internal helper and not exported to loadable module. I'm changing the driver to use dma_request_slave_channel_reason() instead. Further problems from inspection: * The remove function must not call kfree on the host pointer, because it is allocated together with the mmc_host. * The clock is never released * The dma_cap_mask_t is completely unused and can be removed * deferred probing does not work if the dma driver is loaded after the mmc driver. This patch should fix all of the above. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Jonas Jensen <jonas.jensen@gmail.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/host/moxart-mmc.c20
1 files changed, 9 insertions, 11 deletions
diff --git a/drivers/mmc/host/moxart-mmc.c b/drivers/mmc/host/moxart-mmc.c
index d2a1ef61ec97..006f1862444b 100644
--- a/drivers/mmc/host/moxart-mmc.c
+++ b/drivers/mmc/host/moxart-mmc.c
@@ -17,6 +17,7 @@
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/delay.h>
+#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/blkdev.h>
#include <linux/dma-mapping.h>
@@ -562,7 +563,6 @@ static int moxart_probe(struct platform_device *pdev)
struct dma_slave_config cfg;
struct clk *clk;
void __iomem *reg_mmc;
- dma_cap_mask_t mask;
int irq, ret;
u32 i;
@@ -586,9 +586,8 @@ static int moxart_probe(struct platform_device *pdev)
goto out;
}
- clk = of_clk_get(node, 0);
+ clk = devm_clk_get(dev, NULL);
if (IS_ERR(clk)) {
- dev_err(dev, "of_clk_get failed\n");
ret = PTR_ERR(clk);
goto out;
}
@@ -603,9 +602,6 @@ static int moxart_probe(struct platform_device *pdev)
if (ret)
goto out;
- dma_cap_zero(mask);
- dma_cap_set(DMA_SLAVE, mask);
-
host = mmc_priv(mmc);
host->mmc = mmc;
host->base = reg_mmc;
@@ -613,8 +609,8 @@ static int moxart_probe(struct platform_device *pdev)
host->timeout = msecs_to_jiffies(1000);
host->sysclk = clk_get_rate(clk);
host->fifo_width = readl(host->base + REG_FEATURE) << 2;
- host->dma_chan_tx = of_dma_request_slave_channel(node, "tx");
- host->dma_chan_rx = of_dma_request_slave_channel(node, "rx");
+ host->dma_chan_tx = dma_request_slave_channel_reason(dev, "tx");
+ host->dma_chan_rx = dma_request_slave_channel_reason(dev, "rx");
spin_lock_init(&host->lock);
@@ -624,6 +620,11 @@ static int moxart_probe(struct platform_device *pdev)
mmc->ocr_avail = 0xffff00; /* Support 2.0v - 3.6v power. */
if (IS_ERR(host->dma_chan_tx) || IS_ERR(host->dma_chan_rx)) {
+ if (PTR_ERR(host->dma_chan_tx) == -EPROBE_DEFER ||
+ PTR_ERR(host->dma_chan_rx) == -EPROBE_DEFER) {
+ ret = -EPROBE_DEFER;
+ goto out;
+ }
dev_dbg(dev, "PIO mode transfer enabled\n");
host->have_dma = false;
} else {
@@ -702,9 +703,6 @@ static int moxart_remove(struct platform_device *pdev)
writel(readl(host->base + REG_CLOCK_CONTROL) | CLK_OFF,
host->base + REG_CLOCK_CONTROL);
}
-
- kfree(host);
-
return 0;
}