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i2c: imx: improve the error handling in i2c_imx_dma_request()

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Improve the error handling in i2c_imx_dma_request() and let it return an error
indication that the caller then can handle accordingly.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Acked-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Oleksij Rempel 2019-01-09 06:56:50 +01:00 committed by Wolfram Sang
parent 5b3a23a3cc
commit e1ab9a468e
1 changed files with 10 additions and 6 deletions
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16
drivers/i2c/busses/i2c-imx.c
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@ -273,8 +273,8 @@ static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx,
} }
/* Functions for DMA support */ /* Functions for DMA support */
static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx, static int i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_addr_t phy_addr) dma_addr_t phy_addr)
{ {
struct imx_i2c_dma *dma; struct imx_i2c_dma *dma;
struct dma_slave_config dma_sconfig; struct dma_slave_config dma_sconfig;
@ -283,7 +283,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL); dma = devm_kzalloc(dev, sizeof(*dma), GFP_KERNEL);
if (!dma) if (!dma)
return; return -ENOMEM;
dma->chan_tx = dma_request_chan(dev, "tx"); dma->chan_tx = dma_request_chan(dev, "tx");
if (IS_ERR(dma->chan_tx)) { if (IS_ERR(dma->chan_tx)) {
@ -328,7 +328,7 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dev_info(dev, "using %s (tx) and %s (rx) for DMA transfers\n", dev_info(dev, "using %s (tx) and %s (rx) for DMA transfers\n",
dma_chan_name(dma->chan_tx), dma_chan_name(dma->chan_rx)); dma_chan_name(dma->chan_tx), dma_chan_name(dma->chan_rx));
return; return 0;
fail_rx: fail_rx:
dma_release_channel(dma->chan_rx); dma_release_channel(dma->chan_rx);
@ -336,6 +336,8 @@ static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_release_channel(dma->chan_tx); dma_release_channel(dma->chan_tx);
fail_al: fail_al:
devm_kfree(dev, dma); devm_kfree(dev, dma);
/* return successfully if there is no dma support */
return ret == -ENODEV ? 0 : ret;
} }
static void i2c_imx_dma_callback(void *arg) static void i2c_imx_dma_callback(void *arg)
@ -1163,11 +1165,13 @@ static int i2c_imx_probe(struct platform_device *pdev)
dev_dbg(&i2c_imx->adapter.dev, "device resources: %pR\n", res); dev_dbg(&i2c_imx->adapter.dev, "device resources: %pR\n", res);
dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n", dev_dbg(&i2c_imx->adapter.dev, "adapter name: \"%s\"\n",
i2c_imx->adapter.name); i2c_imx->adapter.name);
dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
/* Init DMA config if supported */ /* Init DMA config if supported */
i2c_imx_dma_request(i2c_imx, phy_addr); ret = i2c_imx_dma_request(i2c_imx, phy_addr);
if (ret < 0)
goto clk_notifier_unregister;
dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
return 0; /* Return OK */ return 0; /* Return OK */
clk_notifier_unregister: clk_notifier_unregister: