[PATCH v4 22/40] tty: nozomi: optimize interrupt_handler()

[Yury Norov]

In the exit path of interrupt_handler(), dc->flip map is traversed bit
by bit to find and clear set bits and call tty_flip_buffer_push() for
corresponding ports.

Simplify it by using for_each_test_and_clear_bit(), as it skips already
clear bits.

Signed-off-by: Yury Norov <yury.norov@xxxxxxxxx>
---
 drivers/tty/nozomi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/tty/nozomi.c b/drivers/tty/nozomi.c
index e28a921c1637..2fe063190867 100644
--- a/drivers/tty/nozomi.c
+++ b/drivers/tty/nozomi.c
@@ -28,6 +28,7 @@
 /* Enable this to have a lot of debug printouts */
 #define DEBUG
 
+#include <linux/find_atomic.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/pci.h>
@@ -1201,9 +1202,8 @@ static irqreturn_t interrupt_handler(int irq, void *dev_id)
 exit_handler:
 	spin_unlock(&dc->spin_mutex);
 
-	for (a = 0; a < NOZOMI_MAX_PORTS; a++)
-		if (test_and_clear_bit(a, &dc->flip))
-			tty_flip_buffer_push(&dc->port[a].port);
+	for_each_test_and_clear_bit(a, &dc->flip, NOZOMI_MAX_PORTS)
+		tty_flip_buffer_push(&dc->port[a].port);
 
 	return IRQ_HANDLED;
 none:
-- 
2.43.0