[PATCH v2 13/13] serial: omap: don't save IRQ flags on hardirq
From: Felipe Balbi <hidden>
Date: 2012-08-21 12:20:57
Also in:
linux-omap, linux-serial, lkml
Subsystem:
the rest, tty layer and serial drivers · Maintainers:
Linus Torvalds, Greg Kroah-Hartman, Jiri Slaby
When we're running our hardirq handler, there's not need to disable IRQs with spin_lock_irqsave() because IRQs are already disabled. It also makes no difference if we save or not IRQ flags. Switch over to simple spin_lock/spin_unlock and drop the "flags" variable. Signed-off-by: Felipe Balbi <redacted> --- drivers/tty/serial/omap-serial.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index b79c4fa..a79658d 100644
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c@@ -350,11 +350,10 @@ static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) struct tty_struct *tty = up->port.state->port.tty; unsigned int iir, lsr; unsigned int type; - unsigned long flags; irqreturn_t ret = IRQ_HANDLED; int max_count = 256; - spin_lock_irqsave(&up->port.lock, flags); + spin_lock(&up->port.lock); pm_runtime_get_sync(up->dev); do {
@@ -394,7 +393,7 @@ static inline irqreturn_t serial_omap_irq(int irq, void *dev_id) } } while (!(iir & UART_IIR_NO_INT) && max_count--); - spin_unlock_irqrestore(&up->port.lock, flags); + spin_unlock(&up->port.lock); tty_flip_buffer_push(tty);
--
1.7.12.rc3