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staging: vchiq_core: introduce handle_poll

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The function slot_handler_func() has very deep indentations. Moving the
poll handling into separate function could improve the readability.
Use the return value to keep the poll_needed handling at the same place.

Signed-off-by: Stefan Wahren <stefan.wahren@i2se.com>
Link: https://lore.kernel.org/r/1622735405-9980-17-git-send-email-stefan.wahren@i2se.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Stefan Wahren 2021-06-03 17:50:05 +02:00 committed by Greg Kroah-Hartman
parent 826818f88b
commit 33e82ff2a0
1 changed files with 52 additions and 40 deletions
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92
drivers/staging/vc04_services/interface/vchiq_arm/vchiq_core.c
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@ -1992,6 +1992,56 @@ parse_rx_slots(struct vchiq_state *state)
}
}
/**
* handle_poll() - handle service polling and other rare conditions
* @state: vchiq state struct
*
* Context: Process context
*
* Return:
* * 0 - poll handled successful
* * -EAGAIN - retry later
*/
static int
handle_poll(struct vchiq_state *state)
{
switch (state->conn_state) {
case VCHIQ_CONNSTATE_CONNECTED:
/* Poll the services as requested */
poll_services(state);
break;
case VCHIQ_CONNSTATE_PAUSING:
if (queue_message(state, NULL, MAKE_PAUSE, NULL, NULL, 0,
QMFLAGS_NO_MUTEX_UNLOCK) != VCHIQ_RETRY) {
vchiq_set_conn_state(state, VCHIQ_CONNSTATE_PAUSE_SENT);
} else {
/* Retry later */
return -EAGAIN;
}
break;
case VCHIQ_CONNSTATE_RESUMING:
if (queue_message(state, NULL, MAKE_RESUME, NULL, NULL, 0,
QMFLAGS_NO_MUTEX_LOCK) != VCHIQ_RETRY) {
vchiq_set_conn_state(state, VCHIQ_CONNSTATE_CONNECTED);
} else {
/*
* This should really be impossible,
* since the PAUSE should have flushed
* through outstanding messages.
*/
vchiq_log_error(vchiq_core_log_level,
"Failed to send RESUME message");
}
break;
default:
break;
}
return 0;
}
/* Called by the slot handler thread */
static int
slot_handler_func(void *v)
@ -2010,52 +2060,14 @@ slot_handler_func(void *v)
DEBUG_TRACE(SLOT_HANDLER_LINE);
if (state->poll_needed) {
state->poll_needed = 0;
/*
* Handle service polling and other rare conditions here
* out of the mainline code
*/
switch (state->conn_state) {
case VCHIQ_CONNSTATE_CONNECTED:
/* Poll the services as requested */
poll_services(state);
break;
case VCHIQ_CONNSTATE_PAUSING:
if (queue_message(state, NULL, MAKE_PAUSE,
NULL, NULL, 0,
QMFLAGS_NO_MUTEX_UNLOCK)
!= VCHIQ_RETRY) {
vchiq_set_conn_state(state,
VCHIQ_CONNSTATE_PAUSE_SENT);
} else {
/* Retry later */
state->poll_needed = 1;
}
break;
case VCHIQ_CONNSTATE_RESUMING:
if (queue_message(state, NULL, MAKE_RESUME,
NULL, NULL, 0, QMFLAGS_NO_MUTEX_LOCK)
!= VCHIQ_RETRY) {
vchiq_set_conn_state(state,
VCHIQ_CONNSTATE_CONNECTED);
} else {
/*
* This should really be impossible,
* since the PAUSE should have flushed
* through outstanding messages.
*/
vchiq_log_error(vchiq_core_log_level,
"Failed to send RESUME message");
}
break;
default:
break;
}
if (handle_poll(state) == -EAGAIN)
state->poll_needed = 1;
}
DEBUG_TRACE(SLOT_HANDLER_LINE);