提交 4ae0ff16 编写于 作者: L Linus Torvalds

Merge branch 'timer-fixes-for-linus' of...

Merge branch 'timer-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

* 'timer-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  RTC: rtc-omap: Fix a leak of the IRQ during init failure
  posix clocks: Replace mutex with reader/writer semaphore
......@@ -394,7 +394,7 @@ static int __init omap_rtc_probe(struct platform_device *pdev)
return 0;
fail2:
free_irq(omap_rtc_timer, NULL);
free_irq(omap_rtc_timer, rtc);
fail1:
rtc_device_unregister(rtc);
fail0:
......
......@@ -24,6 +24,7 @@
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/posix-timers.h>
#include <linux/rwsem.h>
struct posix_clock;
......@@ -104,7 +105,7 @@ struct posix_clock_operations {
* @ops: Functional interface to the clock
* @cdev: Character device instance for this clock
* @kref: Reference count.
* @mutex: Protects the 'zombie' field from concurrent access.
* @rwsem: Protects the 'zombie' field from concurrent access.
* @zombie: If 'zombie' is true, then the hardware has disappeared.
* @release: A function to free the structure when the reference count reaches
* zero. May be NULL if structure is statically allocated.
......@@ -117,7 +118,7 @@ struct posix_clock {
struct posix_clock_operations ops;
struct cdev cdev;
struct kref kref;
struct mutex mutex;
struct rw_semaphore rwsem;
bool zombie;
void (*release)(struct posix_clock *clk);
};
......
......@@ -19,7 +19,6 @@
*/
#include <linux/device.h>
#include <linux/file.h>
#include <linux/mutex.h>
#include <linux/posix-clock.h>
#include <linux/slab.h>
#include <linux/syscalls.h>
......@@ -34,19 +33,19 @@ static struct posix_clock *get_posix_clock(struct file *fp)
{
struct posix_clock *clk = fp->private_data;
mutex_lock(&clk->mutex);
down_read(&clk->rwsem);
if (!clk->zombie)
return clk;
mutex_unlock(&clk->mutex);
up_read(&clk->rwsem);
return NULL;
}
static void put_posix_clock(struct posix_clock *clk)
{
mutex_unlock(&clk->mutex);
up_read(&clk->rwsem);
}
static ssize_t posix_clock_read(struct file *fp, char __user *buf,
......@@ -156,7 +155,7 @@ static int posix_clock_open(struct inode *inode, struct file *fp)
struct posix_clock *clk =
container_of(inode->i_cdev, struct posix_clock, cdev);
mutex_lock(&clk->mutex);
down_read(&clk->rwsem);
if (clk->zombie) {
err = -ENODEV;
......@@ -172,7 +171,7 @@ static int posix_clock_open(struct inode *inode, struct file *fp)
fp->private_data = clk;
}
out:
mutex_unlock(&clk->mutex);
up_read(&clk->rwsem);
return err;
}
......@@ -211,25 +210,20 @@ int posix_clock_register(struct posix_clock *clk, dev_t devid)
int err;
kref_init(&clk->kref);
mutex_init(&clk->mutex);
init_rwsem(&clk->rwsem);
cdev_init(&clk->cdev, &posix_clock_file_operations);
clk->cdev.owner = clk->ops.owner;
err = cdev_add(&clk->cdev, devid, 1);
if (err)
goto no_cdev;
return err;
no_cdev:
mutex_destroy(&clk->mutex);
return err;
}
EXPORT_SYMBOL_GPL(posix_clock_register);
static void delete_clock(struct kref *kref)
{
struct posix_clock *clk = container_of(kref, struct posix_clock, kref);
mutex_destroy(&clk->mutex);
if (clk->release)
clk->release(clk);
}
......@@ -238,9 +232,9 @@ void posix_clock_unregister(struct posix_clock *clk)
{
cdev_del(&clk->cdev);
mutex_lock(&clk->mutex);
down_write(&clk->rwsem);
clk->zombie = true;
mutex_unlock(&clk->mutex);
up_write(&clk->rwsem);
kref_put(&clk->kref, delete_clock);
}
......
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