Messages in this thread Patch in this message | | | Date | Mon, 19 Feb 2018 17:09:56 +0100 | From | Miguel Ojeda <> | Subject | [PATCH 3/3] auxdisplay: img-ascii-lcd: Silence 2 uninitialized warnings |
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The warnings are:
drivers/auxdisplay/img-ascii-lcd.c: warning: 'err' may be used uninitialized in this function [-Wuninitialized]
At lines 109 and 207. Reported by Geert using the build service several times, e.g.:
https://lkml.org/lkml/2018/2/19/303
They are two false positives, since num_chars > 0 in the three present configurations (boston, malta, sead3). Initializing to an error state by default silences the warning and makes the code print an error in case a num_chars == 0 happens in the future (unlikely, since it does not make sense currently).
The warnings seem to disappear starting with gcc >= 4.9
Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Paul Burton <paul.burton@mips.com> Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com> --- I will queue it up for 4.17.
drivers/auxdisplay/img-ascii-lcd.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/auxdisplay/img-ascii-lcd.c b/drivers/auxdisplay/img-ascii-lcd.c index d8133024fd5d..bd5ebb5c516c 100644 --- a/drivers/auxdisplay/img-ascii-lcd.c +++ b/drivers/auxdisplay/img-ascii-lcd.c @@ -97,7 +97,7 @@ static struct img_ascii_lcd_config boston_config = { static void malta_update(struct img_ascii_lcd_ctx *ctx) { unsigned int i; - int err; + int err = 1; for (i = 0; i < ctx->cfg->num_chars; i++) { err = regmap_write(ctx->regmap, @@ -180,7 +180,7 @@ static int sead3_wait_lcd_idle(struct img_ascii_lcd_ctx *ctx) static void sead3_update(struct img_ascii_lcd_ctx *ctx) { unsigned int i; - int err; + int err = 1; for (i = 0; i < ctx->cfg->num_chars; i++) { err = sead3_wait_lcd_idle(ctx); -- 2.14.1
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