Acquire console lock before enabling and writing to console-uart
to avoid any recursive prints from console write.
for ex:
--> printk
--> uart_console_write
--> get_sync
--> printk from omap_device enable
--> uart_console write
Also during bootup console_lock is not available.
--> uart_add_one_port
--> console_register
--> console_lock
--> console_unlock
--> call_console_drivers (here yet console_lock is not released)
--> uart_console_write
Hence convert prints from omap_device_enable/disable to pr_debug.
Signed-off-by: Govindraj.R <govindraj.raja@xxxxxx>
---
arch/arm/plat-omap/omap_device.c | 8 ++++----
drivers/tty/serial/omap-serial.c | 8 +++++++-
2 files changed, 11 insertions(+), 5 deletions(-)
diff --git a/arch/arm/plat-omap/omap_device.c b/arch/arm/plat-omap/omap_device.c
index 9bbda9a..f7c6dca 100644
--- a/arch/arm/plat-omap/omap_device.c
+++ b/arch/arm/plat-omap/omap_device.c
@@ -145,12 +145,12 @@ static int _omap_device_activate(struct omap_device *od, u8 ignore_lat)
odpl->activate_lat_worst = act_lat;
if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
odpl->activate_lat = act_lat;
- pr_warning("omap_device: %s.%d: new worst case "
+ pr_debug("omap_device: %s.%d: new worst case "
"activate latency %d: %llu\n",
od->pdev.name, od->pdev.id,
od->pm_lat_level, act_lat);
} else
- pr_warning("omap_device: %s.%d: activate "
+ pr_debug("omap_device: %s.%d: activate "
"latency %d higher than exptected. "
"(%llu > %d)\n",
od->pdev.name, od->pdev.id,
@@ -213,12 +213,12 @@ static int _omap_device_deactivate(struct omap_device *od, u8 ignore_lat)
odpl->deactivate_lat_worst = deact_lat;
if (odpl->flags & OMAP_DEVICE_LATENCY_AUTO_ADJUST) {
odpl->deactivate_lat = deact_lat;
- pr_warning("omap_device: %s.%d: new worst case "
+ pr_debug("omap_device: %s.%d: new worst case "
"deactivate latency %d: %llu\n",
od->pdev.name, od->pdev.id,
od->pm_lat_level, deact_lat);
} else
- pr_warning("omap_device: %s.%d: deactivate "
+ pr_debug("omap_device: %s.%d: deactivate "
"latency %d higher than exptected. "
"(%llu > %d)\n",
od->pdev.name, od->pdev.id,
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 633dfb4..7d8ca45 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -1007,7 +1007,10 @@ serial_omap_console_write(struct console *co, const char *s,
struct uart_omap_port *up = serial_omap_console_ports[co->index];
unsigned long flags;
unsigned int ier;
- int locked = 1;
+ int console_lock = 0, locked = 1;
+
+ if (console_trylock())
+ console_lock = 1;
local_irq_save(flags);
if (up->port.sysrq)
@@ -1043,6 +1046,9 @@ serial_omap_console_write(struct console *co, const char *s,
if (up->msr_saved_flags)
check_modem_status(up);
+ if (console_lock)
+ console_unlock();
+
serial_omap_port_disable(up);
if (locked)
spin_unlock(&up->port.lock);
--
1.7.1
--
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