gcc-7 found an ancient bug in the loop driver, leading to a condition that is always false, meaning we ignore the contents of 'card->flags' here:
drivers/isdn/isdnloop/isdnloop.c:412:37: error: ?: using integer constants in boolean context, the expression will always evaluate to 'true' [-Werror=int-in-bool-context] This changes the braces in the expression to ensure we actually compare the flag bits, rather than comparing a constant. As Joe Perches pointed out, an earlier patch of mine incorrectly assumed this was a false-positive warning. Cc: Joe Perches <j...@perches.com> Link: https://patchwork.kernel.org/patch/9840289/ Signed-off-by: Arnd Bergmann <a...@arndb.de> --- drivers/isdn/isdnloop/isdnloop.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/isdn/isdnloop/isdnloop.c b/drivers/isdn/isdnloop/isdnloop.c index 6ffd13466b8c..e97232646ba1 100644 --- a/drivers/isdn/isdnloop/isdnloop.c +++ b/drivers/isdn/isdnloop/isdnloop.c @@ -409,7 +409,7 @@ isdnloop_sendbuf(int channel, struct sk_buff *skb, isdnloop_card *card) return -EINVAL; } if (len) { - if (!(card->flags & (channel) ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE)) + if (!(card->flags & (channel ? ISDNLOOP_FLAGS_B2ACTIVE : ISDNLOOP_FLAGS_B1ACTIVE))) return 0; if (card->sndcount[channel] > ISDNLOOP_MAX_SQUEUE) return 0; -- 2.9.0
