linux-kernel - [PATCH v3 13/23] serial: omap: don't save IRQ flags on hardirq

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Date:	Thu, 23 Aug 2012 13:32:53 +0300
From:	Felipe Balbi <balbi@...com>
To:	alan@...ux.intel.com
Cc:	Tony Lindgren <tony@...mide.com>, Kevin Hilman <khilman@...com>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux ARM Kernel Mailing List 
	<linux-arm-kernel@...ts.infradead.org>,
	linux-serial@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Shubhrajyoti Datta <shubhrajyoti@...com>,
	Sourav Poddar <sourav.poddar@...com>,
	Felipe Balbi <balbi@...com>
Subject: [PATCH v3 13/23] serial: omap: don't save IRQ flags on hardirq

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.

Tested-by: Shubhrajyoti D <shubhrajyoti@...com>
Signed-off-by: Felipe Balbi <balbi@...com>
---
 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 2df725b..8a60212 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_NONE;
 	int max_count = 256;
 
-	spin_lock_irqsave(&up->port.lock, flags);
+	spin_lock(&up->port.lock);
 	pm_runtime_get_sync(up->dev);
 
 	do {
@@ -393,7 +392,7 @@ 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

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