linux-kernel - [PATCH 4/4] tty: mips_ejtag_fdc: Fix passing incompatible pointer type warning

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Date: Thu, 15 Feb 2024 20:17:29 +0300
From: Serge Semin <fancer.lancer@...il.com>
To: Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Jiaxun Yang <jiaxun.yang@...goat.com>
Cc: Serge Semin <fancer.lancer@...il.com>,
	Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
	Stephen Rothwell <sfr@...hwell.id.au>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-mips@...r.kernel.org,
	linux-serial@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 4/4] tty: mips_ejtag_fdc: Fix passing incompatible pointer type warning

mips_ejtag_fdc_encode() method expects having a first argument passed of
the "u8 **" type, meanwhile the driver passes the "const char **" type.
That causes the next build-warning:

drivers/tty/mips_ejtag_fdc.c: In function ‘mips_ejtag_fdc_console_write’:
drivers/tty/mips_ejtag_fdc.c:343:32: error: passing argument 1 of ‘mips_ejtag_fdc_encode’ from incompatible pointer type [-Werror=incompatible-pointer-types]
   word = mips_ejtag_fdc_encode(&buf_ptr, &buf_len, 1);
                                ^
drivers/tty/mips_ejtag_fdc.c:216:24: note: expected ‘const u8 ** {aka const unsigned char **}’ but argument is of type ‘const char **’
 static struct fdc_word mips_ejtag_fdc_encode(const u8 **ptrs,
                        ^~~~~~~~~~~~~~~~~~~~~

Fix it by altering the type of the pointer which is passed to the
mips_ejtag_fdc_encode() method.

Fixes: ce7cbd9a6c81 ("tty: mips_ejtag_fdc: use u8 for character pointers")
Signed-off-by: Serge Semin <fancer.lancer@...il.com>
---
 drivers/tty/mips_ejtag_fdc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/tty/mips_ejtag_fdc.c b/drivers/tty/mips_ejtag_fdc.c
index aac80b69a069..afbf7738c7c4 100644
--- a/drivers/tty/mips_ejtag_fdc.c
+++ b/drivers/tty/mips_ejtag_fdc.c
@@ -309,7 +309,7 @@ static void mips_ejtag_fdc_console_write(struct console *c, const char *s,
 	unsigned int i, buf_len, cpu;
 	bool done_cr = false;
 	char buf[4];
-	const char *buf_ptr = buf;
+	const u8 *buf_ptr = buf;
 	/* Number of bytes of input data encoded up to each byte in buf */
 	u8 inc[4];
 
-- 
2.43.0