i2c: Add request/release_mem_region to i2c-ibm_iic bus driver

Reserving I/O memory for a driver with request_mem_region is necessary to
avoid memory access conflicts. Even if it's never going to happen, it is
cleaner and it allows to monitor I/O memory used in /proc/iomem.

Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@teamlog.com>
Signed-off-by: Jean Delvare <khali@linux-fr.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/i2c/busses/i2c-ibm_iic.c b/drivers/i2c/busses/i2c-ibm_iic.c
index 781a99c1647a..1898e9987021 100644
--- a/drivers/i2c/busses/i2c-ibm_iic.c
+++ b/drivers/i2c/busses/i2c-ibm_iic.c
@@ -680,6 +680,12 @@ static int __devinit iic_probe(struct ocp_device *ocp){
         dev->idx = ocp->def->index;
         ocp_set_drvdata(ocp, dev);
         
+        if (!request_mem_region(ocp->def->paddr, sizeof(struct iic_regs),
+                                "ibm_iic")) {
+                ret = -EBUSY;
+                goto fail1;
+        }
+
         if (!(dev->vaddr = ioremap(ocp->def->paddr, sizeof(struct iic_regs)))){
                 printk(KERN_CRIT "ibm-iic%d: failed to ioremap device registers\n",
                         dev->idx);
@@ -750,6 +756,8 @@ fail:
 
         iounmap(dev->vaddr);
 fail2:  
+        release_mem_region(ocp->def->paddr, sizeof(struct iic_regs));
+fail1:
         ocp_set_drvdata(ocp, NULL);
         kfree(dev);     
         return ret;
@@ -777,6 +785,7 @@ static void __devexit iic_remove(struct ocp_device *ocp)
                     free_irq(dev->irq, dev);
                 }
                 iounmap(dev->vaddr);
+                release_mem_region(ocp->def->paddr, sizeof(struct iic_regs));
                 kfree(dev);
         }
 }