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USB/PCI/PCMCIA: Clean up new_id and remove_id sysfs attribute routines

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This patch (as1514) cleans up some places where new_id and remove_id
sysfs attributes are created and deleted.  Handling both attributes in
a single routine rather than a pair of routines makes the code
smaller.  It also prevents certain kinds of errors, like one we
currently have in the USB subsystem: The removeid attribute is often
created even when newid isn't (because the driver's no_dynamid_id flag
is set).

In the case of the PCMCIA subsystem, the newid attribute is created
but never explicitly deleted.  The patch adds a deletion routine.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Acked-by: Dominik Brodowski <linux@dominikbrodowski.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Alan Stern 2012-01-24 14:35:13 -05:00 committed by Greg Kroah-Hartman
parent fad12ac8c8
commit ed283e9f0a
3 changed files with 43 additions and 74 deletions
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50
drivers/pci/pci-driver.c
View File

@ -188,43 +188,34 @@ store_remove_id(struct device_driver *driver, const char *buf, size_t count)
static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
static int
pci_create_newid_file(struct pci_driver *drv)
pci_create_newid_files(struct pci_driver *drv)
{
int error = 0;
if (drv->probe != NULL)
if (drv->probe != NULL) {
error = driver_create_file(&drv->driver, &driver_attr_new_id);
if (error == 0) {
error = driver_create_file(&drv->driver,
&driver_attr_remove_id);
if (error)
driver_remove_file(&drv->driver,
&driver_attr_new_id);
}
}
return error;
}
static void pci_remove_newid_file(struct pci_driver *drv)
{
driver_remove_file(&drv->driver, &driver_attr_new_id);
}
static int
pci_create_removeid_file(struct pci_driver *drv)
{
int error = 0;
if (drv->probe != NULL)
error = driver_create_file(&drv->driver,&driver_attr_remove_id);
return error;
}
static void pci_remove_removeid_file(struct pci_driver *drv)
static void pci_remove_newid_files(struct pci_driver *drv)
{
driver_remove_file(&drv->driver, &driver_attr_remove_id);
driver_remove_file(&drv->driver, &driver_attr_new_id);
}
#else /* !CONFIG_HOTPLUG */
static inline int pci_create_newid_file(struct pci_driver *drv)
static inline int pci_create_newid_files(struct pci_driver *drv)
{
return 0;
}
static inline void pci_remove_newid_file(struct pci_driver *drv) {}
static inline int pci_create_removeid_file(struct pci_driver *drv)
{
return 0;
}
static inline void pci_remove_removeid_file(struct pci_driver *drv) {}
static inline void pci_remove_newid_files(struct pci_driver *drv) {}
#endif
/**
@ -1136,18 +1127,12 @@ int __pci_register_driver(struct pci_driver *drv, struct module *owner,
if (error)
goto out;
error = pci_create_newid_file(drv);
error = pci_create_newid_files(drv);
if (error)
goto out_newid;
error = pci_create_removeid_file(drv);
if (error)
goto out_removeid;
out:
return error;
out_removeid:
pci_remove_newid_file(drv);
out_newid:
driver_unregister(&drv->driver);
goto out;
@ -1166,8 +1151,7 @@ out_newid:
void
pci_unregister_driver(struct pci_driver *drv)
{
pci_remove_removeid_file(drv);
pci_remove_newid_file(drv);
pci_remove_newid_files(drv);
driver_unregister(&drv->driver);
pci_free_dynids(drv);
}

6
drivers/pcmcia/ds.c
View File

@ -157,6 +157,11 @@ pcmcia_create_newid_file(struct pcmcia_driver *drv)
return error;
}
static void
pcmcia_remove_newid_file(struct pcmcia_driver *drv)
{
driver_remove_file(&drv->drv, &driver_attr_new_id);
}
/**
* pcmcia_register_driver - register a PCMCIA driver with the bus core
@ -201,6 +206,7 @@ EXPORT_SYMBOL(pcmcia_register_driver);
void pcmcia_unregister_driver(struct pcmcia_driver *driver)
{
pr_debug("unregistering driver %s\n", driver->name);
pcmcia_remove_newid_file(driver);
driver_unregister(&driver->drv);
pcmcia_free_dynids(driver);
}

61
drivers/usb/core/driver.c
View File

@ -129,43 +129,39 @@ store_remove_id(struct device_driver *driver, const char *buf, size_t count)
}
static DRIVER_ATTR(remove_id, S_IWUSR, NULL, store_remove_id);
static int usb_create_newid_file(struct usb_driver *usb_drv)
static int usb_create_newid_files(struct usb_driver *usb_drv)
{
int error = 0;
if (usb_drv->no_dynamic_id)
goto exit;
if (usb_drv->probe != NULL)
if (usb_drv->probe != NULL) {
error = driver_create_file(&usb_drv->drvwrap.driver,
&driver_attr_new_id);
if (error == 0) {
error = driver_create_file(&usb_drv->drvwrap.driver,
&driver_attr_remove_id);
if (error)
driver_remove_file(&usb_drv->drvwrap.driver,
&driver_attr_new_id);
}
}
exit:
return error;
}
static void usb_remove_newid_file(struct usb_driver *usb_drv)
static void usb_remove_newid_files(struct usb_driver *usb_drv)
{
if (usb_drv->no_dynamic_id)
return;
if (usb_drv->probe != NULL)
if (usb_drv->probe != NULL) {
driver_remove_file(&usb_drv->drvwrap.driver,
&driver_attr_remove_id);
driver_remove_file(&usb_drv->drvwrap.driver,
&driver_attr_new_id);
}
static int
usb_create_removeid_file(struct usb_driver *drv)
{
int error = 0;
if (drv->probe != NULL)
error = driver_create_file(&drv->drvwrap.driver,
&driver_attr_remove_id);
return error;
}
static void usb_remove_removeid_file(struct usb_driver *drv)
{
driver_remove_file(&drv->drvwrap.driver, &driver_attr_remove_id);
}
}
static void usb_free_dynids(struct usb_driver *usb_drv)
@ -180,22 +176,12 @@ static void usb_free_dynids(struct usb_driver *usb_drv)
spin_unlock(&usb_drv->dynids.lock);
}
#else
static inline int usb_create_newid_file(struct usb_driver *usb_drv)
static inline int usb_create_newid_files(struct usb_driver *usb_drv)
{
return 0;
}
static void usb_remove_newid_file(struct usb_driver *usb_drv)
{
}
static int
usb_create_removeid_file(struct usb_driver *drv)
{
return 0;
}
static void usb_remove_removeid_file(struct usb_driver *drv)
static void usb_remove_newid_files(struct usb_driver *usb_drv)
{
}
@ -872,22 +858,16 @@ int usb_register_driver(struct usb_driver *new_driver, struct module *owner,
usbfs_update_special();
retval = usb_create_newid_file(new_driver);
retval = usb_create_newid_files(new_driver);
if (retval)
goto out_newid;
retval = usb_create_removeid_file(new_driver);
if (retval)
goto out_removeid;
pr_info("%s: registered new interface driver %s\n",
usbcore_name, new_driver->name);
out:
return retval;
out_removeid:
usb_remove_newid_file(new_driver);
out_newid:
driver_unregister(&new_driver->drvwrap.driver);
@ -914,10 +894,9 @@ void usb_deregister(struct usb_driver *driver)
pr_info("%s: deregistering interface driver %s\n",
usbcore_name, driver->name);
usb_remove_removeid_file(driver);
usb_remove_newid_file(driver);
usb_free_dynids(driver);
usb_remove_newid_files(driver);
driver_unregister(&driver->drvwrap.driver);
usb_free_dynids(driver);
usbfs_update_special();
}