linux-kernel - [PATCH, RFC 13/30] cris: sync_serial: remove interruptible_sleep

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Date:	Thu,  2 Jan 2014 13:07:37 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>,
	Jesper Nilsson <jesper.nilsson@...s.com>,
	Mikael Starvik <starvik@...s.com>, linux-cris-kernel@...s.com
Subject: [PATCH, RFC 13/30] cris: sync_serial: remove interruptible_sleep_on

sleep_on and its variants are racy and going away. This replaces
the two uses in the cris sync_serial drivers with the equivalent
but race-free wait_event_interruptible.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Cc: Jesper Nilsson <jesper.nilsson@...s.com>
Cc: Mikael Starvik <starvik@...s.com>
Cc: linux-cris-kernel@...s.com
---
 arch/cris/arch-v10/drivers/sync_serial.c | 4 +++-
 arch/cris/arch-v32/drivers/sync_serial.c | 4 +++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/arch/cris/arch-v10/drivers/sync_serial.c b/arch/cris/arch-v10/drivers/sync_serial.c
index a1c498d..485f2bb 100644
--- a/arch/cris/arch-v10/drivers/sync_serial.c
+++ b/arch/cris/arch-v10/drivers/sync_serial.c
@@ -22,6 +22,7 @@
 #include <linux/init.h>
 #include <linux/mutex.h>
 #include <linux/timer.h>
+#include <linux/wait.h>
 #include <asm/irq.h>
 #include <asm/dma.h>
 #include <asm/io.h>
@@ -1136,7 +1137,8 @@ static ssize_t sync_serial_read(struct file *file, char *buf,
 		if (file->f_flags & O_NONBLOCK)
 			return -EAGAIN;
 
-		interruptible_sleep_on(&port->in_wait_q);
+		wait_event_interruptible(port->in_wait_q,
+					 !(start == end && !port->full));
 		if (signal_pending(current))
 			return -EINTR;
 
diff --git a/arch/cris/arch-v32/drivers/sync_serial.c b/arch/cris/arch-v32/drivers/sync_serial.c
index 219f704..bbb806b 100644
--- a/arch/cris/arch-v32/drivers/sync_serial.c
+++ b/arch/cris/arch-v32/drivers/sync_serial.c
@@ -19,6 +19,7 @@
 #include <linux/init.h>
 #include <linux/timer.h>
 #include <linux/spinlock.h>
+#include <linux/wait.h>
 
 #include <asm/io.h>
 #include <dma.h>
@@ -1144,7 +1145,8 @@ static ssize_t sync_serial_read(struct file * file, char * buf,
 		if (file->f_flags & O_NONBLOCK)
 			return -EAGAIN;
 
-		interruptible_sleep_on(&port->in_wait_q);
+		wait_event_interruptible(port->in_wait_q,
+					 !(start == end && !port->full));
 		if (signal_pending(current))
 			return -EINTR;
 
-- 
1.8.3.2

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