[PATCH] fbdev: claim Cyber2000 SPARC I/O aperture before ioremap

[Chintan Patel <chintanlike@gmail.com>]

Claim the memory resource associated with the Cyber2000 SPARC MMIO
aperture before accessing it.

This is part of the effort to request memory regions in fbdev drivers.

Signed-off-by: Chintan Patel <chintanlike@gmail.com>
---
 drivers/video/fbdev/cyber2000fb.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/video/fbdev/cyber2000fb.c b/drivers/video/fbdev/cyber2000fb.c
index 2d12f8e96c7e..16ed56180ce2 100644
--- a/drivers/video/fbdev/cyber2000fb.c
+++ b/drivers/video/fbdev/cyber2000fb.c
@@ -47,6 +47,7 @@
 #include <linux/io.h>
 #include <linux/i2c.h>
 #include <linux/i2c-algo-bit.h>
+#include <linux/ioport.h>
 
 #ifdef __arm__
 #include <asm/mach-types.h>
@@ -1620,9 +1621,14 @@ static int cyberpro_pci_enable_mmio(struct cfb_info *cfb)
 	 */
 	unsigned char __iomem *iop;
 
+	if (!request_mem_region(0x3000000, 0x5000, "cyber2000fb iop")) {
+		printk(KERN_ERR "iga5000: cannot reserve I/O area 0x3000000\n");
+		return -EBUSY;
+	}
 	iop = ioremap(0x3000000, 0x5000);
 	if (iop == NULL) {
 		printk(KERN_ERR "iga5000: cannot map I/O\n");
+		release_mem_region(0x3000000, 0x5000);
 		return -ENOMEM;
 	}
 
@@ -1633,6 +1639,7 @@ static int cyberpro_pci_enable_mmio(struct cfb_info *cfb)
 	writeb(EXT_BIU_MISC_LIN_ENABLE, iop + 0x3cf);
 
 	iounmap(iop);
+	release_mem_region(0x3000000, 0x5000);
 #else
 	/*
 	 * Most other machine types are "normal", so
-- 
2.43.0