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

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Date: Fri, 23 Feb 2024 10:18:38 +0100
From: Thomas Bogendoerfer <tsbogend@...ha.franken.de>
To: Serge Semin <fancer.lancer@...il.com>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>, Arnd Bergmann <arnd@...db.de>,
	Jiaxun Yang <jiaxun.yang@...goat.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: Re: [PATCH 4/4] tty: mips_ejtag_fdc: Fix passing incompatible
 pointer type warning

On Thu, Feb 15, 2024 at 08:17:29PM +0300, Serge Semin wrote:
> 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];

applied to mips-next.

Thomas.

-- 
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