[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>

diff --git a/drivers/scsi/megaraid/megaraid_sas.c b/drivers/scsi/megaraid/megaraid_sas.c
index e21f638..977b6e8 100644 (file)
--- 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");