linux-kernel - [PATCH 4/6] Input: Remove vmmouse port reservation

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Message-Id: <1453239965-1466-5-git-send-email-syeh@vmware.com>
Date:	Tue, 19 Jan 2016 13:46:03 -0800
From:	"Sinclair Yeh" <syeh@...are.com>
To:	x86@...nel.org
Cc:	linux-kernel@...r.kernel.org, gregkh@...uxfoundation.org,
	Sinclair Yeh <syeh@...are.com>, pv-drivers@...are.com,
	linux-graphics-maintainer@...are.com,
	virtualization@...ts.linux-foundation.org
Subject: [PATCH 4/6] Input: Remove vmmouse port reservation

This port is used by quite a few guest-to-host communication
capabilities, e.g. getting configuration, logging, etc.  Currently
multiple kernel modules, and one or more priviledged guest user
mode app, e.g. open-vm-tools, use this port without reservation.

It was determined that no reservation is required when accessing
the port in this manner.

Signed-off-by: Sinclair Yeh <syeh@...are.com>
Reviewed-by: Thomas Hellstrom <thellstrom@...are.com>
Cc: pv-drivers@...are.com
Cc: linux-graphics-maintainer@...are.com
Cc: virtualization@...ts.linux-foundation.org
Cc: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/input/mouse/vmmouse.c | 19 +------------------
 1 file changed, 1 insertion(+), 18 deletions(-)

diff --git a/drivers/input/mouse/vmmouse.c b/drivers/input/mouse/vmmouse.c
index d06daf6..85fb3d47 100644
--- a/drivers/input/mouse/vmmouse.c
+++ b/drivers/input/mouse/vmmouse.c
@@ -347,16 +347,10 @@ int vmmouse_detect(struct psmouse *psmouse, bool set_properties)
 		return -ENXIO;
 	}
 
-	if (!request_region(VMMOUSE_PROTO_PORT, 4, "vmmouse")) {
-		psmouse_dbg(psmouse, "VMMouse port in use.\n");
-		return -EBUSY;
-	}
-
 	/* Check if the device is present */
 	response = ~VMMOUSE_PROTO_MAGIC;
 	VMMOUSE_CMD(GETVERSION, 0, version, response, dummy1, dummy2);
 	if (response != VMMOUSE_PROTO_MAGIC || version == 0xffffffffU) {
-		release_region(VMMOUSE_PROTO_PORT, 4);
 		return -ENXIO;
 	}
 
@@ -366,8 +360,6 @@ int vmmouse_detect(struct psmouse *psmouse, bool set_properties)
 		psmouse->model = version;
 	}
 
-	release_region(VMMOUSE_PROTO_PORT, 4);
-
 	return 0;
 }
 
@@ -386,7 +378,6 @@ static void vmmouse_disconnect(struct psmouse *psmouse)
 	psmouse_reset(psmouse);
 	input_unregister_device(priv->abs_dev);
 	kfree(priv);
-	release_region(VMMOUSE_PROTO_PORT, 4);
 }
 
 /**
@@ -430,15 +421,10 @@ int vmmouse_init(struct psmouse *psmouse)
 	struct input_dev *rel_dev = psmouse->dev, *abs_dev;
 	int error;
 
-	if (!request_region(VMMOUSE_PROTO_PORT, 4, "vmmouse")) {
-		psmouse_dbg(psmouse, "VMMouse port in use.\n");
-		return -EBUSY;
-	}
-
 	psmouse_reset(psmouse);
 	error = vmmouse_enable(psmouse);
 	if (error)
-		goto release_region;
+		return error;
 
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	abs_dev = input_allocate_device();
@@ -493,8 +479,5 @@ init_fail:
 	kfree(priv);
 	psmouse->private = NULL;
 
-release_region:
-	release_region(VMMOUSE_PROTO_PORT, 4);
-
 	return error;
 }
-- 
1.9.1