[PATCH] sgiioc4: check for no hwifs available

Add a check to the sgiioc4 driver for the case where all available
ide_hwifs structures are in use.

Signed-off-by: Jeremy Higdon <jeremy@sgi.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index af526b6..4ee597d 100644 (file)
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -622,12 +622,18 @@ sgiioc4_ide_setup_pci_device(struct pci_dev *dev, ide_pci_device_t * d)
        ide_hwif_t *hwif;
        int h;
 
+       /*
+        * Find an empty HWIF; if none available, return -ENOMEM.
+        */
        for (h = 0; h < MAX_HWIFS; ++h) {
                hwif = &ide_hwifs[h];
-               /* Find an empty HWIF */
                if (hwif->chipset == ide_unknown)
                        break;
        }
+       if (h == MAX_HWIFS) {
+               printk(KERN_ERR "%s: too many IDE interfaces, no room in table\n", d->name);
+               return -ENOMEM;
+       }
 
        /*  Get the CmdBlk and CtrlBlk Base Registers */
        base = pci_resource_start(dev, 0) + IOC4_CMD_OFFSET;