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kernel: poll: Allow 0 event input

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Allow caller to supply 0 events in which case the function just
does the sleep. This is useful so that the caller does not need
to create artificial events.

Signed-off-by: Jukka Rissanen <jukka.rissanen@linux.intel.com>
This commit is contained in:
Jukka Rissanen 2019-11-01 14:03:32 +02:00 • committed by Andrew Boie
commit cc6317d7ac
1 changed files with 2 additions and 2 deletions
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4
kernel/poll.c
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@ -254,7 +254,7 @@ int z_impl_k_poll(struct k_poll_event *events, int num_events, s32_t timeout)
__ASSERT(!arch_is_in_isr(), ""); __ASSERT(!arch_is_in_isr(), "");
__ASSERT(events != NULL, "NULL events\n"); __ASSERT(events != NULL, "NULL events\n");
__ASSERT(num_events > 0, "zero events\n"); __ASSERT(num_events >= 0, "<0 events\n");
events_registered = register_events(events, num_events, &poller, events_registered = register_events(events, num_events, &poller,
(timeout == K_NO_WAIT)); (timeout == K_NO_WAIT));
@ -311,7 +311,7 @@ static inline int z_vrfy_k_poll(struct k_poll_event *events,
/* Validate the events buffer and make a copy of it in an /* Validate the events buffer and make a copy of it in an
* allocated kernel-side buffer. * allocated kernel-side buffer.
*/ */
if (Z_SYSCALL_VERIFY(num_events > 0)) { if (Z_SYSCALL_VERIFY(num_events >= 0)) {
ret = -EINVAL; ret = -EINVAL;
goto out; goto out;
} }