---
name: "sysfs_schedule_callback"
section: "9"
platform: "linux"
package: "linux-manual-3.2"
version: "3.2.78-1"
release: "Debian 7 (Wheezy)"
platforms: ["linux"]
url: "https://new.carta.tech/sysfs_schedule_callback"
---

# sysfs\_schedule\_callback(9)

helper to schedule a callback for a kobject

## NAME

sysfs\_schedule\_callback - helper to schedule a callback for a kobject

## SYNOPSIS

**int sysfs\_schedule\_callback(struct kobject \*** *kobj***, void (\****func***) (void \*), void \*** *data***, struct module \*** *owner***);**

## ARGUMENTS

*kobj*

object we're acting for.

*func*

callback function to invoke later.

*data*

argument to pass to *func*.

*owner*

module owning the callback code

## DESCRIPTION

sysfs attribute methods must not unregister themselves or their parent kobject (which would amount to the same thing). Attempts to do so will deadlock, since unregistration is mutually exclusive with driver callbacks.

Instead methods can call this routine, which will attempt to allocate and schedule a workqueue request to call back *func* with *data* as its argument in the workqueue's process context. *kobj* will be pinned until *func* returns.

Returns 0 if the request was submitted, -ENOMEM if storage could not be allocated, -ENODEV if a reference to *owner* isn't available, -EAGAIN if a callback has already been scheduled for *kobj*.

## COPYRIGHT