driver.c (cf40a76e7d5874bb25f4404eecc58a2e033af885) driver.c (cb5d8c45ab6c3daf8269e550cfb2d5018a876fe3)
1/*
2 * driver.c - driver support
3 *
4 * (C) 2006-2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
5 * Shaohua Li <shaohua.li@intel.com>
6 * Adam Belay <abelay@novell.com>
7 *
8 * This code is licenced under the GPL.

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249 * Register the driver under a lock to prevent concurrent attempts to
250 * [un]register the driver from occuring at the same time.
251 *
252 * Returns 0 on success, a negative error code (returned by
253 * __cpuidle_register_driver()) otherwise.
254 */
255int cpuidle_register_driver(struct cpuidle_driver *drv)
256{
1/*
2 * driver.c - driver support
3 *
4 * (C) 2006-2007 Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
5 * Shaohua Li <shaohua.li@intel.com>
6 * Adam Belay <abelay@novell.com>
7 *
8 * This code is licenced under the GPL.

--- 240 unchanged lines hidden (view full) ---

249 * Register the driver under a lock to prevent concurrent attempts to
250 * [un]register the driver from occuring at the same time.
251 *
252 * Returns 0 on success, a negative error code (returned by
253 * __cpuidle_register_driver()) otherwise.
254 */
255int cpuidle_register_driver(struct cpuidle_driver *drv)
256{
257 struct cpuidle_governor *gov;
257 int ret;
258
259 spin_lock(&cpuidle_driver_lock);
260 ret = __cpuidle_register_driver(drv);
261 spin_unlock(&cpuidle_driver_lock);
262
258 int ret;
259
260 spin_lock(&cpuidle_driver_lock);
261 ret = __cpuidle_register_driver(drv);
262 spin_unlock(&cpuidle_driver_lock);
263
264 if (!ret && !strlen(param_governor) && drv->governor &&
265 (cpuidle_get_driver() == drv)) {
266 mutex_lock(&cpuidle_lock);
267 gov = cpuidle_find_governor(drv->governor);
268 if (gov) {
269 cpuidle_prev_governor = cpuidle_curr_governor;
270 if (cpuidle_switch_governor(gov) < 0)
271 cpuidle_prev_governor = NULL;
272 }
273 mutex_unlock(&cpuidle_lock);
274 }
275
263 return ret;
264}
265EXPORT_SYMBOL_GPL(cpuidle_register_driver);
266
267/**
268 * cpuidle_unregister_driver - unregisters a driver
269 * @drv: a pointer to a valid struct cpuidle_driver
270 *
271 * Unregisters the cpuidle driver under a lock to prevent concurrent attempts
272 * to [un]register the driver from occuring at the same time. @drv has to
273 * match the currently registered driver.
274 */
275void cpuidle_unregister_driver(struct cpuidle_driver *drv)
276{
276 return ret;
277}
278EXPORT_SYMBOL_GPL(cpuidle_register_driver);
279
280/**
281 * cpuidle_unregister_driver - unregisters a driver
282 * @drv: a pointer to a valid struct cpuidle_driver
283 *
284 * Unregisters the cpuidle driver under a lock to prevent concurrent attempts
285 * to [un]register the driver from occuring at the same time. @drv has to
286 * match the currently registered driver.
287 */
288void cpuidle_unregister_driver(struct cpuidle_driver *drv)
289{
290 bool enabled = (cpuidle_get_driver() == drv);
291
277 spin_lock(&cpuidle_driver_lock);
278 __cpuidle_unregister_driver(drv);
279 spin_unlock(&cpuidle_driver_lock);
292 spin_lock(&cpuidle_driver_lock);
293 __cpuidle_unregister_driver(drv);
294 spin_unlock(&cpuidle_driver_lock);
295
296 if (!enabled)
297 return;
298
299 mutex_lock(&cpuidle_lock);
300 if (cpuidle_prev_governor) {
301 if (!cpuidle_switch_governor(cpuidle_prev_governor))
302 cpuidle_prev_governor = NULL;
303 }
304 mutex_unlock(&cpuidle_lock);
280}
281EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);
282
283/**
284 * cpuidle_get_driver - return the driver tied to the current CPU.
285 *
286 * Returns a struct cpuidle_driver pointer, or NULL if no driver is registered.
287 */

--- 69 unchanged lines hidden --- 		305}
306EXPORT_SYMBOL_GPL(cpuidle_unregister_driver);
307
308/**
309 * cpuidle_get_driver - return the driver tied to the current CPU.
310 *
311 * Returns a struct cpuidle_driver pointer, or NULL if no driver is registered.
312 */

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