staging: sm7xxfb: reserve PCI resource

before starting to access any address inside the PCI region we should
reserve the resource and release the resource when the module exits.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 10 insertions, 0 deletions

diff --git a/drivers/staging/sm7xxfb/sm7xxfb.c b/drivers/staging/sm7xxfb/sm7xxfb.c
index 5b3e6143a0ba..149286efda5d 100644
--- a/drivers/staging/sm7xxfb/sm7xxfb.c
+++ b/drivers/staging/sm7xxfb/sm7xxfb.c
@@ -776,6 +776,12 @@ static int smtcfb_pci_probe(struct pci_dev *pdev,
         if (err)
                 return err;
 
+        err = pci_request_region(pdev, 0, "sm7xxfb");
+        if (err < 0) {
+                dev_err(&pdev->dev, "cannot reserve framebuffer region\n");
+                goto failed_regions;
+        }
+
         sprintf(smtcfb_fix.id, "sm%Xfb", ent->device);
 
         sfb = smtc_alloc_fb_info(pdev);
@@ -905,6 +911,9 @@ failed_fb:
         smtc_free_fb_info(sfb);
 
 failed_free:
+        pci_release_region(pdev, 0);
+
+failed_regions:
         pci_disable_device(pdev);
 
         return err;
@@ -933,6 +942,7 @@ static void smtcfb_pci_remove(struct pci_dev *pdev)
         smtc_unmap_mmio(sfb);
         unregister_framebuffer(&sfb->fb);
         smtc_free_fb_info(sfb);
+        pci_release_region(pdev, 0);
 }
 
 #ifdef CONFIG_PM