[PATCH] IDE core: driver layer error checking

Check driver layer return values in IDE core.

Signed-off-by: Randy Dunlap <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/ide/ide-probe.c

···
 
 static void hwif_register (ide_hwif_t *hwif)
 {
+	int ret;
+
 	/* register with global device tree */
 	strlcpy(hwif->gendev.bus_id,hwif->name,BUS_ID_SIZE);
 	hwif->gendev.driver_data = hwif;
···
 			hwif->gendev.parent = NULL;
 	}
 	hwif->gendev.release = hwif_release_dev;
-	device_register(&hwif->gendev);
+	ret = device_register(&hwif->gendev);
+	if (ret < 0)
+		printk(KERN_WARNING "IDE: %s: device_register error: %d\n",
+			__FUNCTION__, ret);
 }
 
 static int wait_hwif_ready(ide_hwif_t *hwif)
···
 
 	if (hwif->present) {
 		u16 unit = 0;
+		int ret;
+
 		for (unit = 0; unit < MAX_DRIVES; ++unit) {
 			ide_drive_t *drive = &hwif->drives[unit];
 			/* For now don't attach absent drives, we may
 			   want them on default or a new "empty" class
 			   for hotplug reprobing ? */
 			if (drive->present) {
-				device_register(&drive->gendev);
+				ret = device_register(&drive->gendev);
+				if (ret < 0)
+					printk(KERN_WARNING "IDE: %s: "
+						"device_register error: %d\n",
+						__FUNCTION__, ret);
 			}
 		}
 	}
···
 			if (hwif->chipset == ide_unknown || hwif->chipset == ide_forced)
 				hwif->chipset = ide_generic;
 			for (unit = 0; unit < MAX_DRIVES; ++unit)
-				if (hwif->drives[unit].present)
-					device_register(&hwif->drives[unit].gendev);
+				if (hwif->drives[unit].present) {
+					int ret = device_register(
+						&hwif->drives[unit].gendev);
+					if (ret < 0)
+						printk(KERN_WARNING "IDE: %s: "
+							"device_register error: %d\n",
+							__FUNCTION__, ret);
+				}
 		}
 	}
 	return 0;

drivers/ide/ide-proc.c

···
 {
 	struct device *dev = &drive->gendev;
 	int ret = 1;
+	int err;
 
 	down_write(&dev->bus->subsys.rwsem);
 	device_release_driver(dev);
 	/* FIXME: device can still be in use by previous driver */
 	strlcpy(drive->driver_req, driver, sizeof(drive->driver_req));
-	device_attach(dev);
+	err = device_attach(dev);
+	if (err < 0)
+		printk(KERN_WARNING "IDE: %s: device_attach error: %d\n",
+			__FUNCTION__, err);
 	drive->driver_req[0] = 0;
-	if (dev->driver == NULL)
-		device_attach(dev);
+	if (dev->driver == NULL) {
+		err = device_attach(dev);
+		if (err < 0)
+			printk(KERN_WARNING
+				"IDE: %s: device_attach(2) error: %d\n",
+				__FUNCTION__, err);
+	}
 	if (dev->driver && !strcmp(dev->driver->name, driver))
 		ret = 0;
 	up_write(&dev->bus->subsys.rwsem);
···
 
 static int ide_drivers_show(struct seq_file *s, void *p)
 {
-	bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
+	int err;
+
+	err = bus_for_each_drv(&ide_bus_type, NULL, s, proc_print_driver);
+	if (err < 0)
+		printk(KERN_WARNING "IDE: %s: bus_for_each_drv error: %d\n",
+			__FUNCTION__, err);
 	return 0;
 }
 

drivers/ide/ide.c

···
  */
 static int __init ide_init(void)
 {
+	int ret;
+
 	printk(KERN_INFO "Uniform Multi-Platform E-IDE driver " REVISION "\n");
 	system_bus_speed = ide_system_bus_speed();
 
-	bus_register(&ide_bus_type);
+	ret = bus_register(&ide_bus_type);
+	if (ret < 0) {
+		printk(KERN_WARNING "IDE: bus_register error: %d\n", ret);
+		return ret;
+	}
 
 	init_ide_data();