Commit 0324a821 authored by Ruchika Kharwar's avatar Ruchika Kharwar Committed by Greg Kroah-Hartman

serial: omap: unlock the port lock

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: default avatarShubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: default avatarRuchika Kharwar <ruchika@ti.com>
Signed-off-by: default avatarPavan Savoy <pavan_savoy@ti.com>
Signed-off-by: default avatarVijay Badawadagi <bvijay@ti.com>
Signed-off-by: default avatarFelipe Balbi <balbi@ti.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 52c5513d
...@@ -224,8 +224,11 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr) ...@@ -224,8 +224,11 @@ static void transmit_chars(struct uart_omap_port *up, unsigned int lsr)
break; break;
} while (--count > 0); } 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); uart_write_wakeup(&up->port);
spin_lock(&up->port.lock);
}
if (uart_circ_empty(xmit)) if (uart_circ_empty(xmit))
serial_omap_stop_tx(&up->port); serial_omap_stop_tx(&up->port);
......
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