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Commit 89cd0661 authored by Chandana Kishori Chiluveru's avatar Chandana Kishori Chiluveru Committed by Gerrit - the friendly Code Review server
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serial: msm_geni_serial: Bailout from suspend if RX data is pending 



This change is to resolve potential race btw stop rx and cancel rx
due to interrupt latency in the system.

Change-Id: I7b510949f75bac5ec9f8f42f3d139131b259600f
Signed-off-by: default avatarChandana Kishori Chiluveru <cchiluve@codeaurora.org>
parent 8753585c

drivers/tty/serial/msm_geni_serial.c

+10 −0
Original line number Diff line number Diff line
@@ -1492,6 +1492,7 @@ static int stop_rx_sequencer(struct uart_port *uport) 
	bool is_rx_active;

	unsigned int stale_delay;

	u32 dma_rx_status, s_irq_status;

	int usage_count;



	IPC_LOG_MSG(port->ipc_log_misc, "%s\n", __func__);
@@ -1535,6 +1536,15 @@ static int stop_rx_sequencer(struct uart_port *uport) 
			IPC_LOG_MSG(port->ipc_log_misc, "%s: Interrupt delay\n",

					 __func__);

			handle_rx_dma_xfer(s_irq_status, uport);

			if (!port->ioctl_count) {

				usage_count = atomic_read(

						&uport->dev->power.usage_count);

				IPC_LOG_MSG(port->ipc_log_misc,

					"%s: Abort Stop Rx, extend the PM timer, usage_count:%d\n",

					__func__, usage_count);

				pm_runtime_mark_last_busy(uport->dev);

				return -EBUSY;

			}

		}

	}