From d717e7da45b382c09cee4f1e03ce30124e672e07 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Wed, 4 Dec 2019 16:50:36 -0800 Subject: [PATCH] auxdisplay: charlcd: deduplicate simple_strtoul() Like in commit 8b2303de399f ("serial: core: Fix handling of options after MMIO address") we may use simple_strtoul() which in comparison to kstrtoul() can do conversion in-place without additional and unnecessary code to be written. Link: http://lkml.kernel.org/r/20190801192904.41087-2-andriy.shevchenko@linux.intel.com Signed-off-by: Andy Shevchenko Reviewed-by: Petr Mladek Cc: Geert Uytterhoeven Cc: Mans Rullgard Cc: Miguel Ojeda Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/auxdisplay/charlcd.c | 34 +++++++--------------------------- 1 file changed, 7 insertions(+), 27 deletions(-) diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c index bef6b85778b6..874c259a8829 100644 --- a/drivers/auxdisplay/charlcd.c +++ b/drivers/auxdisplay/charlcd.c @@ -287,31 +287,6 @@ static int charlcd_init_display(struct charlcd *lcd) return 0; } -/* - * Parses an unsigned integer from a string, until a non-digit character - * is found. The empty string is not accepted. No overflow checks are done. - * - * Returns whether the parsing was successful. Only in that case - * the output parameters are written to. - * - * TODO: If the kernel adds an inplace version of kstrtoul(), this function - * could be easily replaced by that. - */ -static bool parse_n(const char *s, unsigned long *res, const char **next_s) -{ - if (!isdigit(*s)) - return false; - - *res = 0; - while (isdigit(*s)) { - *res = *res * 10 + (*s - '0'); - ++s; - } - - *next_s = s; - return true; -} - /* * Parses a movement command of the form "(.*);", where the group can be * any number of subcommands of the form "(x|y)[0-9]+". @@ -336,6 +311,7 @@ static bool parse_xy(const char *s, unsigned long *x, unsigned long *y) { unsigned long new_x = *x; unsigned long new_y = *y; + char *p; for (;;) { if (!*s) @@ -345,11 +321,15 @@ static bool parse_xy(const char *s, unsigned long *x, unsigned long *y) break; if (*s == 'x') { - if (!parse_n(s + 1, &new_x, &s)) + new_x = simple_strtoul(s + 1, &p, 10); + if (p == s + 1) return false; + s = p; } else if (*s == 'y') { - if (!parse_n(s + 1, &new_y, &s)) + new_y = simple_strtoul(s + 1, &p, 10); + if (p == s + 1) return false; + s = p; } else { return false; }