[04/12] mtd: rawnand: stm32_fmc2: manage all errors cases at probe time

[Christophe Kerello]

This patch defers its probe when the expected reset control is not
yet ready. This patch also handles properly all errors cases at probe
time.

Signed-off-by: Christophe Kerello <christophe.kerello@xxxxxx>
---
 drivers/mtd/nand/raw/stm32_fmc2_nand.c | 13 +++++++++----
 1 file changed, 9 insertions(+), 4 deletions(-)

diff --git a/drivers/mtd/nand/raw/stm32_fmc2_nand.c b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
index b6d45cd..0a96797 100644
--- a/drivers/mtd/nand/raw/stm32_fmc2_nand.c
+++ b/drivers/mtd/nand/raw/stm32_fmc2_nand.c
@@ -1967,7 +1967,11 @@ static int stm32_fmc2_probe(struct platform_device *pdev)
 	}
 
 	rstc = devm_reset_control_get(dev, NULL);
-	if (!IS_ERR(rstc)) {
+	if (IS_ERR(rstc)) {
+		ret = PTR_ERR(rstc);
+		if (ret == -EPROBE_DEFER)
+			goto err_clk_disable;
+	} else {
 		reset_control_assert(rstc);
 		reset_control_deassert(rstc);
 	}
@@ -1975,7 +1979,7 @@ static int stm32_fmc2_probe(struct platform_device *pdev)
 	/* DMA setup */
 	ret = stm32_fmc2_dma_setup(fmc2);
 	if (ret)
-		return ret;
+		goto err_dma_setup;
 
 	/* FMC2 init routine */
 	stm32_fmc2_init(fmc2);
@@ -1997,7 +2001,7 @@ static int stm32_fmc2_probe(struct platform_device *pdev)
 	/* Scan to find existence of the device */
 	ret = nand_scan(chip, nand->ncs);
 	if (ret)
-		goto err_scan;
+		goto err_dma_setup;
 
 	ret = mtd_device_register(mtd, NULL, 0);
 	if (ret)
@@ -2010,7 +2014,7 @@ static int stm32_fmc2_probe(struct platform_device *pdev)
 err_device_register:
 	nand_cleanup(chip);
 
-err_scan:
+err_dma_setup:
 	if (fmc2->dma_ecc_ch)
 		dma_release_channel(fmc2->dma_ecc_ch);
 	if (fmc2->dma_tx_ch)
@@ -2021,6 +2025,7 @@ static int stm32_fmc2_probe(struct platform_device *pdev)
 	sg_free_table(&fmc2->dma_data_sg);
 	sg_free_table(&fmc2->dma_ecc_sg);
 
+err_clk_disable:
 	clk_disable_unprepare(fmc2->clk);
 
 	return ret;
-- 
1.9.1