[PATCH v3 3/4] mtd: rawnand: mtk: Add validity check for CE# pin setting

[Xiaolei Li <xiaolei.li@xxxxxxxxxxxx>]

Currently, we only check how many CE# pins are set in device tree.
But it should be necessary to check whether CE# pin setting is
duplicated or if CE# pin index exceeds the maximum CE# number that
controller supports.

So, add validity check to avoid these invalid settings.

Signed-off-by: Xiaolei Li <xiaolei.li@xxxxxxxxxxxx>
Reviewed-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
---
 drivers/mtd/nand/raw/mtk_nand.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/drivers/mtd/nand/raw/mtk_nand.c b/drivers/mtd/nand/raw/mtk_nand.c
index 6b79a0f9aef8..14a9b8c2a8db 100644
--- a/drivers/mtd/nand/raw/mtk_nand.c
+++ b/drivers/mtd/nand/raw/mtk_nand.c
@@ -162,6 +162,8 @@ struct mtk_nfc {
 	struct list_head chips;
 
 	u8 *buffer;
+
+	unsigned long assigned_cs;
 };
 
 /*
@@ -1367,6 +1369,17 @@ static int mtk_nfc_nand_chip_init(struct device *dev, struct mtk_nfc *nfc,
 			dev_err(dev, "reg property failure : %d\n", ret);
 			return ret;
 		}
+
+		if (tmp >= MTK_NAND_MAX_NSELS) {
+			dev_err(dev, "invalid CS: %u\n", tmp);
+			return -EINVAL;
+		}
+
+		if (test_and_set_bit(tmp, &nfc->assigned_cs)) {
+			dev_err(dev, "CS %u already assigned\n", tmp);
+			return -EINVAL;
+		}
+
 		chip->sels[i] = tmp;
 	}
 
-- 
2.18.0


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