提交 e1ab9a46 编写于 作者: O Oleksij Rempel 提交者: Wolfram Sang

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

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: NOleksij Rempel <o.rempel@pengutronix.de>
Acked-by: NUwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: NWolfram Sang <wsa@the-dreams.de>
上级 5b3a23a3
......@@ -273,8 +273,8 @@ static inline unsigned char imx_i2c_read_reg(struct imx_i2c_struct *i2c_imx,
}
/* Functions for DMA support */
static void i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_addr_t phy_addr)
static int i2c_imx_dma_request(struct imx_i2c_struct *i2c_imx,
dma_addr_t phy_addr)
{
struct imx_i2c_dma *dma;
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);
if (!dma)
return;
return -ENOMEM;
dma->chan_tx = dma_request_chan(dev, "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",
dma_chan_name(dma->chan_tx), dma_chan_name(dma->chan_rx));
return;
return 0;
fail_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);
fail_al:
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)
......@@ -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, "adapter name: \"%s\"\n",
i2c_imx->adapter.name);
dev_info(&i2c_imx->adapter.dev, "IMX I2C adapter registered\n");
/* 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 */
clk_notifier_unregister:
......
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