[SCSI] SCSI megaraid_sas: handle thrown errors

- handle clear_user() error

- handle and properly unwind from sysfs errors thrown during mod init

- adjust order of calls in megasas_exit() to precisely match
  registration order in megasas_init()

Signed-off-by: Jeff Garzik <jeff@garzik.org>

Updated for extra attribute and
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 30 insertions, 12 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index e21f638c00a..977b6e8d852 100644
--- a/drivers/scsi/megaraid/megaraid_sas.c
+++ b/drivers/scsi/megaraid/megaraid_sas.c
@@ -2864,7 +2864,8 @@ static int megasas_mgmt_compat_ioctl_fw(struct file *file, unsigned long arg)
         int i;
         int error = 0;
 
-        clear_user(ioc, sizeof(*ioc));
+        if (clear_user(ioc, sizeof(*ioc)))
+                return -EFAULT;
 
         if (copy_in_user(&ioc->host_no, &cioc->host_no, sizeof(u16)) ||
             copy_in_user(&ioc->sgl_off, &cioc->sgl_off, sizeof(u32)) ||
@@ -3010,16 +3011,33 @@ static int __init megasas_init(void)
 
         if (rval) {
                 printk(KERN_DEBUG "megasas: PCI hotplug regisration failed \n");
-                unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
-        }
-
-        driver_create_file(&megasas_pci_driver.driver, &driver_attr_version);
-        driver_create_file(&megasas_pci_driver.driver,
-                           &driver_attr_release_date);
-        driver_create_file(&megasas_pci_driver.driver,
-                           &driver_attr_dbg_lvl);
+                goto err_pcidrv;
+        }
+
+        rval = driver_create_file(&megasas_pci_driver.driver,
+                                  &driver_attr_version);
+        if (rval)
+                goto err_dcf_attr_ver;
+        rval = driver_create_file(&megasas_pci_driver.driver,
+                                  &driver_attr_release_date);
+        if (rval)
+                goto err_dcf_rel_date;
+        rval = driver_create_file(&megasas_pci_driver.driver,
+                                  &driver_attr_dbg_lvl);
+        if (rval)
+                goto err_dcf_dbg_lvl;
 
         return rval;
+err_dcf_dbg_lvl:
+        driver_remove_file(&megasas_pci_driver.driver,
+                           &driver_attr_release_date);
+err_dcf_rel_date:
+        driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
+err_dcf_attr_ver:
+        pci_unregister_driver(&megasas_pci_driver);
+err_pcidrv:
+        unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");
+        return rval;
 }
 
 /**
@@ -3027,11 +3045,11 @@ static int __init megasas_init(void)
  */
 static void __exit megasas_exit(void)
 {
-        driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
-        driver_remove_file(&megasas_pci_driver.driver,
-                           &driver_attr_release_date);
         driver_remove_file(&megasas_pci_driver.driver,
                            &driver_attr_dbg_lvl);
+        driver_remove_file(&megasas_pci_driver.driver,
+                           &driver_attr_release_date);
+        driver_remove_file(&megasas_pci_driver.driver, &driver_attr_version);
 
         pci_unregister_driver(&megasas_pci_driver);
         unregister_chrdev(megasas_mgmt_majorno, "megaraid_sas_ioctl");