pch_console_write was calling:
local_irq_save()
spin_lock(a)
spin_lock(b)
...
spin_unlock(b)
spin_unlock(a)
local_irq_restore()
Which trips the rtmutex debug code:
BUG: sleeping function called from invalid context at kernel/rtmutex.c:646
Update the function to use the _nort versions of local_irq* (thanks Peterz for
the suggestion).
local_irq_save_nort()
spin_lock(a)
spin_lock(b)
...
spin_unlock(b)
spin_unlock(a)
local_irq_restore_nort()
Signed-off-by: Darren Hart <dvh...@linux.intel.com>
CC: Tomoya MORINAGA <tomoya.r...@gmail.com>
CC: Feng Tang <feng.t...@intel.com>
CC: Alexander Stein <alexander.st...@systec-electronic.com>
CC: Greg Kroah-Hartman <gre...@linuxfoundation.org>
CC: Alan Cox <a...@linux.intel.com>
CC: Steven Rostedt <rost...@goodmis.org>
CC: Peter Zijlstra <pet...@infradead.org>
CC: linux-ser...@vger.kernel.org
---
drivers/tty/serial/pch_uart.c | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/tty/serial/pch_uart.c b/drivers/tty/serial/pch_uart.c
index db61d00..9164cef 100644
--- a/drivers/tty/serial/pch_uart.c
+++ b/drivers/tty/serial/pch_uart.c
@@ -1489,7 +1489,7 @@ pch_console_write(struct console *co, const char *s,
unsigned int count)
touch_nmi_watchdog();
- local_irq_save(flags);
+ local_irq_save_nort(flags);
spin_lock(&priv->lock);
if (priv->port.sysrq) {
/* serial8250_handle_port() already took the lock */
@@ -1519,7 +1519,7 @@ pch_console_write(struct console *co, const char *s,
unsigned int count)
if (locked)
spin_unlock(&priv->port.lock);
spin_unlock(&priv->lock);
- local_irq_restore(flags);
+ local_irq_restore_nort(flags);
}
--
1.7.5.4
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