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Subject[PATCH v2] mtd: rawnand: au1550nd: Fix au_read_buf16() prototype
Commit 7e534323c416 ("mtd: rawnand: Pass a nand_chip object to
chip->read_xxx() hooks") modified the prototype of the struct nand_chip
read_buf function pointer. In the au1550nd driver we have 2
implementations of read_buf. The previously mentioned commit modified
the au_read_buf() implementation to match the function pointer, but not
au_read_buf16(). This results in a compiler warning for MIPS
db1xxx_defconfig builds:

warning: pointer type mismatch in conditional expression

Fix this by updating the prototype of au_read_buf16() to take a struct
nand_chip pointer as its first argument, as is expected after commit
7e534323c416 ("mtd: rawnand: Pass a nand_chip object to chip->read_xxx()

Note that this shouldn't have caused any functional issues at runtime,
since the offset of the struct mtd_info within struct nand_chip is 0
making mtd_to_nand() effectively a type-cast.

Signed-off-by: Paul Burton <>
Fixes: 7e534323c416 ("mtd: rawnand: Pass a nand_chip object to chip->read_xxx() hooks")
Cc: Boris Brezillon <>
Cc: Miquel Raynal <>
Cc: David Woodhouse <>
Cc: Brian Norris <>
Cc: Marek Vasut <>
Cc: Vignesh Raghavendra <>
Cc: # v4.20+


Changes in v2:
- Update kerneldoc comment too...

drivers/mtd/nand/raw/au1550nd.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/raw/au1550nd.c b/drivers/mtd/nand/raw/au1550nd.c
index 97a97a9ccc36..e10b76089048 100644
--- a/drivers/mtd/nand/raw/au1550nd.c
+++ b/drivers/mtd/nand/raw/au1550nd.c
@@ -134,16 +134,15 @@ static void au_write_buf16(struct nand_chip *this, const u_char *buf, int len)

* au_read_buf16 - read chip data into buffer
- * @mtd: MTD device structure
+ * @this: NAND chip object
* @buf: buffer to store date
* @len: number of bytes to read
* read function for 16bit buswidth
-static void au_read_buf16(struct mtd_info *mtd, u_char *buf, int len)
+static void au_read_buf16(struct nand_chip *this, u_char *buf, int len)
int i;
- struct nand_chip *this = mtd_to_nand(mtd);
u16 *p = (u16 *) buf;
len >>= 1;

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