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drivers/usbdev/cdcacm.c: Add some missing logic when flow control is disabled. Also make sure that the flowcontrol and rxint can handle being re-entered when cdcacm_release_rxpending() is called.

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This commit is contained in:
Gregory Nutt
2017-09-27 06:03:22 -06:00
parent 9bc65f4686
commit 7ceedd2b52
1 changed files with 63 additions and 25 deletions
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drivers/usbdev/cdcacm.c
+63 -25
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@@ -2534,16 +2534,19 @@ static void cdcuart_rxint(FAR struct uart_dev_s *dev, bool enable)
if (!priv->rxenabled)
{
/* Yes. During the time that RX interrupts are disabled,
* incoming packets were queued in priv->rxpending. We must
* now free all of them (unless flow control becomes enabled)
*/
(void)cdcacm_release_rxpending(priv);
/* RX "interrupts are no longer disabled */
priv->rxenabled = true;
/* During the time that RX interrupts was disabled, incoming
* packets were queued in priv->rxpending. We must now process
* all of them (unless flow control becomes enabled)
*
* NOTE: This action may cause this function to be re-entered
* with enable == false.
*/
(void)cdcacm_release_rxpending(priv);
}
}
@@ -2588,7 +2591,6 @@ static bool cdcuart_rxflowcontrol(FAR struct uart_dev_s *dev,
{
#ifdef CONFIG_CDCACM_IFLOWCONTROL
FAR struct cdcacm_dev_s *priv;
uint8_t mask;
int ret;
/* Sanity check */
@@ -2614,28 +2616,61 @@ static bool cdcuart_rxflowcontrol(FAR struct uart_dev_s *dev,
* or clear it if the upper water mark has been crossed.
*/
mask = upper ? 0 : CDCACM_UART_DSR;
/* Don't do anything unless this results in a change in the setting of
* DSR.
*/
if (((priv->serialstate ^ mask) & CDCACM_UART_DSR) != 0)
if (upper)
{
/* Set or clear DSR (set DCD in any case). */
/* Don't do anything unless this results in a change in the
* setting of DSR.
*/
priv->serialstate &= ~CDCACM_UART_DSR;
priv->serialstate |= (mask | CDCACM_UART_DCD);
if ((priv->serialstate & CDCACM_UART_DSR) != 0)
{
/* Clear DSR (set DCD in any case). */
/* And send the SerialState message */
priv->serialstate &= ~CDCACM_UART_DSR;
priv->serialstate |= CDCACM_UART_DCD;
ret = cdcacm_serialstate(priv);
return (ret >= 0 && upper);
/* And send the SerialState message */
ret = cdcacm_serialstate(priv);
if (ret >= 0)
{
priv->iflow = true;
return true;
}
}
}
/* Return true of DSR is not set */
/* Lower watermark crossing. Don't do anything unless this results in
* a change in the setting of DSR.
*/
return ((priv->serialstate & CDCACM_UART_DSR) == 0);
else if ((priv->serialstate & CDCACM_UART_DSR) == 0)
{
/* Set DSR (set DCD in any case). */
priv->serialstate |= (CDCACM_UART_DSR | CDCACM_UART_DCD);
/* And send the SerialState message */
ret = cdcacm_serialstate(priv);
if (ret >= 0)
{
/* Needed by cdcacm_release_rxpending() */
priv->iflow = false;
/* During the time that flow control ws disabled,
* incoming packets were queued in priv->rxpending. We
* must now process all of them (unless RX interrupts
* becomes enabled)
*
* NOTE: This action may cause this function to be re
* entered with upper == false.
*/
(void)cdcacm_release_rxpending(priv);
}
}
}
else
{
@@ -2651,9 +2686,12 @@ static bool cdcuart_rxflowcontrol(FAR struct uart_dev_s *dev,
(void)cdcacm_serialstate(priv);
}
return false;
}
/* Return true of DSR is not set */
priv->iflow = ((priv->serialstate & CDCACM_UART_DSR) == 0);
return priv->iflow;
#else
return false;