[Xen-devel] [PATCH] pciback: check function return values

["Jan Beulich" <jbeulich@xxxxxxxxxx>]

.. of functions declared with __must_check post-2.6.18.

(As a note - I'm getting the impression that when used as a module, pciback
appears to have a number of memory leaks).

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>

Index: head-2007-03-19/drivers/xen/pciback/conf_space_header.c
===================================================================
--- head-2007-03-19.orig/drivers/xen/pciback/conf_space_header.c        
2007-03-21 10:18:08.000000000 +0100
+++ head-2007-03-19/drivers/xen/pciback/conf_space_header.c     2007-03-28 
11:50:57.000000000 +0200
@@ -20,11 +20,15 @@ struct pci_bar_info {
 
 static int command_write(struct pci_dev *dev, int offset, u16 value, void 
*data)
 {
+       int err;
+
        if (!dev->is_enabled && is_enable_cmd(value)) {
                if (unlikely(verbose_request))
                        printk(KERN_DEBUG "pciback: %s: enable\n",
                               pci_name(dev));
-               pci_enable_device(dev);
+               err = pci_enable_device(dev);
+               if (err)
+                       return err;
        } else if (dev->is_enabled && !is_enable_cmd(value)) {
                if (unlikely(verbose_request))
                        printk(KERN_DEBUG "pciback: %s: disable\n",
@@ -44,7 +48,13 @@ static int command_write(struct pci_dev 
                        printk(KERN_DEBUG
                               "pciback: %s: enable memory-write-invalidate\n",
                               pci_name(dev));
-               pci_set_mwi(dev);
+               err = pci_set_mwi(dev);
+               if (err) {
+                       printk(KERN_WARNING
+                              "pciback: %s: cannot enable 
memory-write-invalidate (%d)\n",
+                              pci_name(dev), err);
+                       value &= ~PCI_COMMAND_INVALIDATE;
+               }
        }
 
        return pci_write_config_word(dev, offset, value);
Index: head-2007-03-19/drivers/xen/pciback/pci_stub.c
===================================================================
--- head-2007-03-19.orig/drivers/xen/pciback/pci_stub.c 2007-03-19 
15:26:06.000000000 +0100
+++ head-2007-03-19/drivers/xen/pciback/pci_stub.c      2007-03-28 
12:50:30.000000000 +0200
@@ -805,6 +805,18 @@ static ssize_t permissive_show(struct de
 
 DRIVER_ATTR(permissive, S_IRUSR | S_IWUSR, permissive_show, permissive_add);
 
+static void pcistub_exit(void)
+{
+       driver_remove_file(&pciback_pci_driver.driver, &driver_attr_new_slot);
+       driver_remove_file(&pciback_pci_driver.driver,
+                          &driver_attr_remove_slot);
+       driver_remove_file(&pciback_pci_driver.driver, &driver_attr_slots);
+       driver_remove_file(&pciback_pci_driver.driver, &driver_attr_quirks);
+       driver_remove_file(&pciback_pci_driver.driver, &driver_attr_permissive);
+
+       pci_unregister_driver(&pciback_pci_driver);
+}
+
 static int __init pcistub_init(void)
 {
        int pos = 0;
@@ -845,12 +857,23 @@ static int __init pcistub_init(void)
        if (err < 0)
                goto out;
 
-       driver_create_file(&pciback_pci_driver.driver, &driver_attr_new_slot);
-       driver_create_file(&pciback_pci_driver.driver,
-                          &driver_attr_remove_slot);
-       driver_create_file(&pciback_pci_driver.driver, &driver_attr_slots);
-       driver_create_file(&pciback_pci_driver.driver, &driver_attr_quirks);
-       driver_create_file(&pciback_pci_driver.driver, &driver_attr_permissive);
+       err = driver_create_file(&pciback_pci_driver.driver,
+                                &driver_attr_new_slot);
+       if (!err)
+               err = driver_create_file(&pciback_pci_driver.driver,
+                                        &driver_attr_remove_slot);
+       if (!err)
+               err = driver_create_file(&pciback_pci_driver.driver,
+                                        &driver_attr_slots);
+       if (!err)
+               err = driver_create_file(&pciback_pci_driver.driver,
+                                        &driver_attr_quirks);
+       if (!err)
+               err = driver_create_file(&pciback_pci_driver.driver,
+                                        &driver_attr_permissive);
+
+       if (err)
+               pcistub_exit();
 
       out:
        return err;
@@ -887,23 +910,17 @@ static int __init pciback_init(void)
 #endif
 
        pcistub_init_devices_late();
-       pciback_xenbus_register();
+       err = pciback_xenbus_register();
+       if (err)
+               pciback_exit();
 
-       return 0;
+       return err;
 }
 
 static void __exit pciback_cleanup(void)
 {
        pciback_xenbus_unregister();
-
-       driver_remove_file(&pciback_pci_driver.driver, &driver_attr_new_slot);
-       driver_remove_file(&pciback_pci_driver.driver,
-                          &driver_attr_remove_slot);
-       driver_remove_file(&pciback_pci_driver.driver, &driver_attr_slots);
-       driver_remove_file(&pciback_pci_driver.driver, &driver_attr_quirks);
-       driver_remove_file(&pciback_pci_driver.driver, &driver_attr_permissive);
-
-       pci_unregister_driver(&pciback_pci_driver);
+       pciback_exit();
 }
 
 module_init(pciback_init);



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