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[v4,15/21] serial: omap: unlock the port lock

Message ID 1346935540-1792-16-git-send-email-balbi@ti.com (mailing list archive)
State New, archived
Headers show

Commit Message

Felipe Balbi Sept. 6, 2012, 12:45 p.m. UTC 
From: Ruchika Kharwar <ruchika@ti.com>

This patch unlocks the port lock before calling a serial_core API
and re-acquires the port lock after calling it.
This patch fixes a system freeze issue seen when the serial_core
API uart_write_wakeup() eventually attempts to acquire the port lock
already acquired by omap serial interrupt handler.

Tested-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Ruchika Kharwar <ruchika@ti.com>
Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Signed-off-by: Vijay Badawadagi <bvijay@ti.com>
Signed-off-by: Felipe Balbi <balbi@ti.com>
---
 drivers/tty/serial/omap-serial.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)
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Patch

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index d244163..9e4419c 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -224,8 +224,11 @@  static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
 			break;
 	} while (--count > 0);
 
-	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
+	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS) {
+		spin_unlock(&up->port.lock);
 		uart_write_wakeup(&up->port);
+		spin_lock(&up->port.lock);
+	}
 
 	if (uart_circ_empty(xmit))
 		serial_omap_stop_tx(&up->port);