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Subject[RFC/PATCH 3/5] sysfs: (driver/pci) if show/store is missing return -ENOSYS
Date
sysfs: fix drivers/pci so if an attribute does not implement
show or store method read/write will return -ENOSYS
instead of 0.

Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
---
hotplug/pci_hotplug_core.c | 4 ++--
hotplug/rpadlpar_sysfs.c | 2 +-
pci-driver.c | 26 ++++++++++++++------------
3 files changed, 17 insertions(+), 15 deletions(-)
Index: dtor/drivers/pci/hotplug/rpadlpar_sysfs.c
===================================================================
--- dtor.orig/drivers/pci/hotplug/rpadlpar_sysfs.c
+++ dtor/drivers/pci/hotplug/rpadlpar_sysfs.c
@@ -48,7 +48,7 @@ dlpar_attr_store(struct kobject * kobj,
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) : -ENOSYS;
}

static struct sysfs_ops dlpar_attr_sysfs_ops = {
Index: dtor/drivers/pci/pci-driver.c
===================================================================
--- dtor.orig/drivers/pci/pci-driver.c
+++ dtor/drivers/pci/pci-driver.c
@@ -327,13 +327,14 @@ pci_driver_attr_show(struct kobject * ko
{
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) : -ENOSYS;
+
+ put_driver(driver);
return ret;
}

@@ -343,13 +344,14 @@ pci_driver_attr_store(struct kobject * k
{
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) : -ENOSYS;
+
+ put_driver(driver);
return ret;
}

Index: dtor/drivers/pci/hotplug/pci_hotplug_core.c
===================================================================
--- dtor.orig/drivers/pci/hotplug/pci_hotplug_core.c
+++ dtor/drivers/pci/hotplug/pci_hotplug_core.c
@@ -73,7 +73,7 @@ static ssize_t hotplug_slot_attr_show(st
{
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) : -ENOSYS;
}

static ssize_t hotplug_slot_attr_store(struct kobject *kobj,
@@ -81,7 +81,7 @@ static ssize_t hotplug_slot_attr_store(s
{
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) : -ENOSYS;
}

static struct sysfs_ops hotplug_slot_sysfs_ops = {
-
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