[PATCH] sysfs: (driver/pci) if show/store is missing return -EIO

sysfs: fix drivers/pci so if an attribute does not implement
       show or store method read/write will return -EIO
       instead of 0.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 17 insertions, 15 deletions

diff --git a/drivers/pci/hotplug/pci_hotplug_core.c b/drivers/pci/hotplug/pci_hotplug_core.c
index c802f6270b89..c4282902cb52 100644
--- a/drivers/pci/hotplug/pci_hotplug_core.c
+++ b/drivers/pci/hotplug/pci_hotplug_core.c
@@ -73,7 +73,7 @@ static ssize_t hotplug_slot_attr_show(struct kobject *kobj,
 {
         struct hotplug_slot *slot = to_hotplug_slot(kobj);
         struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
-        return attribute->show ? attribute->show(slot, buf) : 0;
+        return attribute->show ? attribute->show(slot, buf) : -EIO;
 }
 
 static ssize_t hotplug_slot_attr_store(struct kobject *kobj,
@@ -81,7 +81,7 @@ static ssize_t hotplug_slot_attr_store(struct kobject *kobj,
 {
         struct hotplug_slot *slot = to_hotplug_slot(kobj);
         struct hotplug_slot_attribute *attribute = to_hotplug_attr(attr);
-        return attribute->store ? attribute->store(slot, buf, len) : 0;
+        return attribute->store ? attribute->store(slot, buf, len) : -EIO;
 }
 
 static struct sysfs_ops hotplug_slot_sysfs_ops = {
diff --git a/drivers/pci/hotplug/rpadlpar_sysfs.c b/drivers/pci/hotplug/rpadlpar_sysfs.c
index 3285b822478d..752e6513c447 100644
--- a/drivers/pci/hotplug/rpadlpar_sysfs.c
+++ b/drivers/pci/hotplug/rpadlpar_sysfs.c
@@ -48,7 +48,7 @@ dlpar_attr_store(struct kobject * kobj, struct attribute * attr,
         struct dlpar_io_attr *dlpar_attr = container_of(attr,
                                                 struct dlpar_io_attr, attr);
         return dlpar_attr->store ?
-                dlpar_attr->store(dlpar_attr, buf, nbytes) : 0;
+                dlpar_attr->store(dlpar_attr, buf, nbytes) : -EIO;
 }
 
 static struct sysfs_ops dlpar_attr_sysfs_ops = {
diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c
index cf2cff7480f1..e65bf2b395aa 100644
--- a/drivers/pci/pci-driver.c
+++ b/drivers/pci/pci-driver.c
@@ -335,13 +335,14 @@ pci_driver_attr_show(struct kobject * kobj, struct attribute *attr, char *buf)
 {
         struct device_driver *driver = kobj_to_pci_driver(kobj);
         struct driver_attribute *dattr = attr_to_driver_attribute(attr);
-        ssize_t ret = 0;
+        ssize_t ret;
 
-        if (get_driver(driver)) {
-                if (dattr->show)
-                        ret = dattr->show(driver, buf);
-                put_driver(driver);
-        }
+        if (!get_driver(driver))
+                return -ENODEV;
+
+        ret = dattr->show ? dattr->show(driver, buf) : -EIO;
+
+        put_driver(driver);
         return ret;
 }
 
@@ -351,13 +352,14 @@ pci_driver_attr_store(struct kobject * kobj, struct attribute *attr,
 {
         struct device_driver *driver = kobj_to_pci_driver(kobj);
         struct driver_attribute *dattr = attr_to_driver_attribute(attr);
-        ssize_t ret = 0;
+        ssize_t ret;
 
-        if (get_driver(driver)) {
-                if (dattr->store)
-                        ret = dattr->store(driver, buf, count);
-                put_driver(driver);
-        }
+        if (!get_driver(driver))
+                return -ENODEV;
+
+        ret = dattr->store ? dattr->store(driver, buf, count) : -EIO;
+
+        put_driver(driver);
         return ret;
 }