[PATCH 15/18] mtd: rawnand: nand_base: annotate switch/case fallthrough

[Andre Przywara]

The raw NAND flash code uses an implicit switch/case fallthrough to
share code when dealing with different ECC modes, and also when handling
some read command.

Add our "fallthrough;" statement-like macro before the respective labels
in the NAND code, to avoid a warning when GCC's -Wimplicit-fallthrough
warning option is enabled.

This copies the fallthrough annotations that the original kernel code
gained, before this function got refactored there.

Signed-off-by: Andre Przywara <andre.przywara at arm.com>
---
 drivers/mtd/nand/raw/nand_base.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index 1b65c6f6443..daf12807c67 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -774,6 +774,7 @@ static void nand_command_lp(struct mtd_info *mtd, unsigned int command,
 			       NAND_NCE | NAND_CTRL_CHANGE);
 
 		/* This applies to read commands */
+		fallthrough;
 	default:
 		/*
 		 * If we don't have access to the busy pin, we apply the given
@@ -4974,6 +4975,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		if (!ecc->read_page)
 			ecc->read_page = nand_read_page_hwecc_oob_first;
 
+		fallthrough;
 	case NAND_ECC_HW:
 		/* Use standard hwecc read page function? */
 		if (!ecc->read_page)
@@ -4993,6 +4995,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 		if (!ecc->write_subpage && ecc->hwctl && ecc->calculate)
 			ecc->write_subpage = nand_write_subpage_hwecc;
 
+		fallthrough;
 	case NAND_ECC_HW_SYNDROME:
 		if ((!ecc->calculate || !ecc->correct || !ecc->hwctl) &&
 		    (!ecc->read_page ||
@@ -5027,6 +5030,7 @@ int nand_scan_tail(struct mtd_info *mtd)
 			ecc->size, mtd->writesize);
 		ecc->mode = NAND_ECC_SOFT;
 
+		fallthrough;
 	case NAND_ECC_SOFT:
 		ecc->calculate = nand_calculate_ecc;
 		ecc->correct = nand_correct_data;
-- 
2.25.1