[PATCH 5.3 108/112] mtd: rawnand: au1550nd: Fix au_read_buf16() prototype

From: Greg Kroah-Hartman
Date: Wed Oct 16 2019 - 18:00:57 EST

From: Paul Burton <paul.burton@xxxxxxxx>

commit df8fed831cbcdce7b283b2d9c1aadadcf8940d05 upstream.

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 <paul.burton@xxxxxxxx>
Fixes: 7e534323c416 ("mtd: rawnand: Pass a nand_chip object to chip->read_xxx() hooks")
Cc: stable@xxxxxxxxxxxxxxx # v4.20+
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Signed-off-by: Miquel Raynal <miquel.raynal@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

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

--- 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_c

* 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;