xiaoxiang781216 commented on a change in pull request #5624:
URL: https://github.com/apache/incubator-nuttx/pull/5624#discussion_r817035988
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File path: drivers/input/ajoystick.c
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@@ -722,6 +720,19 @@ static int ajoy_poll(FAR struct file *filep, FAR struct
pollfd *fds,
opriv->ao_fds[i] = fds;
fds->priv = &opriv->ao_fds[i];
+
+ /* Report if the event is pending */
+
+ if (opriv->ao_pollpending)
+ {
+ fds->revents |= (fds->events & POLLIN);
+ if (fds->revents != 0)
+ {
+ iinfo("Report events: %02x\n", fds->revents);
+ nxsem_post(fds->sem);
Review comment:
Since the semaphore used by poll always initialize before xxx_poll, so
there is no real difference here. But for the semaphore used to wake up
xxx_read, post without check may wake up read thread unexpectedly.
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