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braille-console: Fix value returned by _braille_console_setup

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commit bbeddf52ad ("printk: move braille console support into
separate braille.[ch] files") introduced _braille_console_setup()
to outline the braille initialization code.  There was however some
confusion over the value it was supposed to return. commit 2cfe6c4ac7
("printk: Fix return of braille_register_console()") tried to fix it
but failed to.

This fixes and documents the returned value according to the use
in printk.c: non-zero return means a parsing error, and thus this
console configuration should be ignored.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Cc: Aleksey Makarov <aleksey.makarov@linaro.org>
Cc: Joe Perches <joe@perches.com>
Cc: Ming Lei <ming.lei@canonical.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Acked-by: Petr Mladek <pmladek@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Samuel Thibault 2017-03-26 22:47:36 +02:00 committed by Greg Kroah-Hartman
parent cfa6eb2391
commit 2ed2b8621b
2 changed files with 18 additions and 10 deletions
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15
kernel/printk/braille.c
View file

@ -2,12 +2,13 @@
#include <linux/kernel.h>
#include <linux/console.h>
#include <linux/errno.h>
#include <linux/string.h>
#include "console_cmdline.h"
#include "braille.h"
char *_braille_console_setup(char **str, char **brl_options)
int _braille_console_setup(char **str, char **brl_options)
{
if (!strncmp(*str, "brl,", 4)) {
*brl_options = "";
@ -15,14 +16,14 @@ char *_braille_console_setup(char **str, char **brl_options)
} else if (!strncmp(*str, "brl=", 4)) {
*brl_options = *str + 4;
*str = strchr(*brl_options, ',');
if (!*str)
if (!*str) {
pr_err("need port name after brl=\n");
else
*((*str)++) = 0;
} else
return NULL;
return -EINVAL;
}
*((*str)++) = 0;
}
return *str;
return 0;
}
int

13
kernel/printk/braille.h
View file

@ -9,7 +9,14 @@ braille_set_options(struct console_cmdline *c, char *brl_options)
c->brl_options = brl_options;
}
char *
/*
* Setup console according to braille options.
* Return -EINVAL on syntax error, 0 on success (or no braille option was
* actually given).
* Modifies str to point to the serial options
* Sets brl_options to the parsed braille options.
*/
int
_braille_console_setup(char **str, char **brl_options);
int
@ -25,10 +32,10 @@ braille_set_options(struct console_cmdline *c, char *brl_options)
{
}
static inline char *
static inline int
_braille_console_setup(char **str, char **brl_options)
{
return NULL;
return 0;
}
static inline int