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wireless/bluetooth: Use nxsem_timedwait() vs nxsem_wait() when waiting for response from the HCI device. Adding this timeout prevents things from hanging when there is a problem with the connect HCI UART (in the current test, when there is no HCI UART connected).

This commit is contained in:
Gregory Nutt 2018-04-14 15:09:12 -06:00
parent 3b74f80981
commit 9aa1c6c3d5
1 changed files with 60 additions and 7 deletions
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59
wireless/bluetooth/bt_hcicore.c
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@ -49,9 +49,12 @@
#include <string.h>
#include <stdio.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/irq.h>
#include <nuttx/clock.h>
#include <nuttx/kthread.h>
#include <nuttx/semaphore.h>
#include <nuttx/net/bluetooth.h>
@ -71,6 +74,14 @@
#define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0]))
/* Wait up to 2.5 seconds for a response. This delay is arbitrary and
* intended only to avoid hangs while waiting for a response. It may need
* to be adjusted.
*/
#define TIMEOUT_SEC 2
#define TIMEOUT_NSEC 500 * 1024 * 1024
/****************************************************************************
* Private Types
****************************************************************************/
@ -1491,26 +1502,68 @@ int bt_hci_cmd_send_sync(uint16_t opcode, FAR struct bt_buf_s *buf,
wlinfo("opcode %x len %u\n", opcode, buf->len);
/* Set up for the wait */
nxsem_init(&sync_sem, 0, 0);
nxsem_setprotocol(&sync_sem, SEM_PRIO_NONE);
buf->u.hci.sync = &sync_sem;
/* Send the frame */
ret = bt_queue_send(g_btdev.tx_queue, buf, BT_NORMAL_PRIO);
if (ret < 0)
{
wlerr("ERROR: bt_queue_send() failed: %d\n", ret);
}
else
{
struct timespec abstime;
irqstate_t flags;
/* Wait for the response to the command. An I/O error will be
* declared if the response does not occur within the timeout
* interval.
*
* Get the current time. Not that we must be in critical section here
* so that we can be assured that there will be no context switches
* between the time that we calculate the delay time and until we get
* to the wait.
*/
flags = enter_critical_section();
ret = clock_gettime(CLOCK_REALTIME, &abstime);
if (ret >= 0)
{
/* Add the offset to the time in the future */
abstime.tv_sec += TIMEOUT_SEC;
abstime.tv_nsec += TIMEOUT_NSEC;
/* Handle carry from nanoseconds to seconds */
if (abstime.tv_nsec >= NSEC_PER_SEC)
{
abstime.tv_nsec -= NSEC_PER_SEC;
abstime.tv_sec++;
}
/* Now wait for the response. The critical section will be
* released while we are waiting.
*/
do
{
ret = nxsem_wait(&sync_sem);
/* The timed wait could also be awakened by a signal */
ret = nxsem_timedwait(&sync_sem, &abstime);
}
while (ret == -EINTR);
}
/* Indicate failure if we failed to get the return parameters */
leave_critical_section(flags);
}
/* Indicate failure if we failed to get the response */
if (ret >= 0)
{
@ -1525,7 +1578,7 @@ int bt_hci_cmd_send_sync(uint16_t opcode, FAR struct bt_buf_s *buf,
}
}
if (rsp)
if (rsp != NULL)
{
*rsp = buf->u.hci.sync;
}