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List:       linux-virtualization
Subject:    [RFC PATCH 5/8] virtio: console: Use wait_event_freezable instead of
From:       Amit Shah <amit.shah () redhat ! com>
Date:       2011-07-28 14:47:10
Message-ID: b2634bc36bb4b0ab8ddcd5cf283ae6b455adb214.1311863438.git.amit.shah () redhat ! com
[Download RAW message or body]

Get ready to support suspend/resume by using the freezable calls so that
blocking read/write syscalls are handled properly across suspend/resume.

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 drivers/char/virtio_console.c |    9 +++++----
 1 files changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/char/virtio_console.c b/drivers/char/virtio_console.c
index 3c10b10..a7dfd02 100644
--- a/drivers/char/virtio_console.c
+++ b/drivers/char/virtio_console.c
@@ -21,6 +21,7 @@
 #include <linux/debugfs.h>
 #include <linux/device.h>
 #include <linux/err.h>
+#include <linux/freezer.h>
 #include <linux/fs.h>
 #include <linux/init.h>
 #include <linux/list.h>
@@ -633,8 +634,8 @@ static ssize_t port_fops_read(struct file *filp, char __user *ubuf,
 		if (filp->f_flags & O_NONBLOCK)
 			return -EAGAIN;
 
-		ret = wait_event_interruptible(port->waitqueue,
-					       !will_read_block(port));
+		ret = wait_event_freezable(port->waitqueue,
+					   !will_read_block(port));
 		if (ret < 0)
 			return ret;
 	}
@@ -677,8 +678,8 @@ static ssize_t port_fops_write(struct file *filp, const char __user *ubuf,
 		if (nonblock)
 			return -EAGAIN;
 
-		ret = wait_event_interruptible(port->waitqueue,
-					       !will_write_block(port));
+		ret = wait_event_freezable(port->waitqueue,
+					   !will_write_block(port));
 		if (ret < 0)
 			return ret;
 	}
-- 
1.7.6

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