[PATCH] video: fbdev: Request IO ports

[PATCH] video: fbdev: Request IO ports

[Daniel Matyas]

Some fbdev drivers do not request their memory correctly. Request the IO
ports' memory so no other driver may access them. Only request 1 byte,
because the inb() and out() are used for reading and writing.

Did not test on hardware.

Signed-off-by: Daniel Matyas <matyasdaniel006@gmail.com>
---
 drivers/video/fbdev/arcfb.c | 8 ++++++++
 drivers/video/fbdev/n411.c  | 5 +++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/video/fbdev/arcfb.c b/drivers/video/fbdev/arcfb.c
index b807cf07522d..6771a7409cde 100644
--- a/drivers/video/fbdev/arcfb.c
+++ b/drivers/video/fbdev/arcfb.c
@@ -481,6 +481,14 @@ static int arcfb_probe(struct platform_device *dev)
 		printk(KERN_WARNING "no IO addresses supplied\n");
 		goto err_addr;
 	}
+
+	if (!devm_request_region(&dev->dev, dio_addr, 1, "arcfb") ||
+		!devm_request_region(&dev->dev, cio_addr, 1, "arcfb") ||
+		!devm_request_region(&dev->dev, c2io_addr, 1, "arcfb")) {
+		retval = -EBUSY;
+		goto err_addr;
+	}
+
 	par->dio_addr = dio_addr;
 	par->cio_addr = cio_addr;
 	par->c2io_addr = c2io_addr;
diff --git a/drivers/video/fbdev/n411.c b/drivers/video/fbdev/n411.c
index a3677313396e..ed0281939d37 100644
--- a/drivers/video/fbdev/n411.c
+++ b/drivers/video/fbdev/n411.c
@@ -165,6 +165,11 @@ static int __init n411_init(void)
 	if (!n411_device)
 		return -ENOMEM;
 
+	if (!devm_request_region(&n411_device->dev, dio_addr, 1, "n411") ||
+		!devm_request_region(&n411_device->dev, cio_addr, 1, "n411") ||
+		!devm_request_region(&n411_device->dev, c2io_addr, 1, "n411"))
+		return -EBUSY;
+
 	ret = platform_device_add_data(n411_device, &n411_board,
 				       sizeof(n411_board));
 	if (ret)
-- 
2.55.0