mtd: rawnand: intel: Fix error handling in probe

ebu_nand_probe() did not invoke ebu_dma_cleanup() and
clk_disable_unprepare() on some error handling paths. The patch fixes
that.

Found by Linux Driver Verification project (linuxtesting.org).

Fixes: 0b1039f0 ("mtd: rawnand: Add NAND controller support on Intel LGM SoC")
Signed-off-by: Evgeny Novikov <novikov@ispras.ru>
Co-developed-by: Kirill Shilimanov <kirill.shilimanov@huawei.com>
Signed-off-by: Kirill Shilimanov <kirill.shilimanov@huawei.com>
Co-developed-by: Anton Vasilyev <vasilyev@ispras.ru>
Signed-off-by: Anton Vasilyev <vasilyev@ispras.ru>
Cc: stable@vger.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20210817092930.23040-1-novikov@ispras.ru

drivers/mtd/nand/raw/intel-nand-controller.c

@@ -631,19 +631,26 @@ static int ebu_nand_probe(struct platform_device *pdev)
 	ebu_host->clk_rate = clk_get_rate(ebu_host->clk);
 
 	ebu_host->dma_tx = dma_request_chan(dev, "tx");
-	if (IS_ERR(ebu_host->dma_tx))
-		return dev_err_probe(dev, PTR_ERR(ebu_host->dma_tx),
-				     "failed to request DMA tx chan!.\n");
+	if (IS_ERR(ebu_host->dma_tx)) {
+		ret = dev_err_probe(dev, PTR_ERR(ebu_host->dma_tx),
+				    "failed to request DMA tx chan!.\n");
+		goto err_disable_unprepare_clk;
+	}
 
 	ebu_host->dma_rx = dma_request_chan(dev, "rx");
-	if (IS_ERR(ebu_host->dma_rx))
-		return dev_err_probe(dev, PTR_ERR(ebu_host->dma_rx),
-				     "failed to request DMA rx chan!.\n");
+	if (IS_ERR(ebu_host->dma_rx)) {
+		ret = dev_err_probe(dev, PTR_ERR(ebu_host->dma_rx),
+				    "failed to request DMA rx chan!.\n");
+		ebu_host->dma_rx = NULL;
+		goto err_cleanup_dma;
+	}
 
 	resname = devm_kasprintf(dev, GFP_KERNEL, "addr_sel%d", cs);
 	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, resname);
-	if (!res)
-		return -EINVAL;
+	if (!res) {
+		ret = -EINVAL;
+		goto err_cleanup_dma;
+	}
 	ebu_host->cs[cs].addr_sel = res->start;
 	writel(ebu_host->cs[cs].addr_sel | EBU_ADDR_MASK(5) | EBU_ADDR_SEL_REGEN,
 	       ebu_host->ebu + EBU_ADDR_SEL(cs));
@@ -653,7 +660,8 @@ static int ebu_nand_probe(struct platform_device *pdev)
 	mtd = nand_to_mtd(&ebu_host->chip);
 	if (!mtd->name) {
 		dev_err(ebu_host->dev, "NAND label property is mandatory\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto err_cleanup_dma;
 	}
 
 	mtd->dev.parent = dev;
@@ -681,6 +689,7 @@ static int ebu_nand_probe(struct platform_device *pdev)
 	nand_cleanup(&ebu_host->chip);
 err_cleanup_dma:
 	ebu_dma_cleanup(ebu_host);
+err_disable_unprepare_clk:
 	clk_disable_unprepare(ebu_host->clk);
 
 	return ret;