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ide: IDE settings don't need an ide_lock held 

IDE settings are protected by ide_setting_mtx mutex so there is
no need to hold ide_lock in ide_setting_ioctl(), ide_read_setting()
and ide_proc_unregister_driver().

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2008-12-29 20:27:29 +01:00
parent 3e0e29f737
commit 1f473e9c92
2 changed files with 4 additions and 24 deletions
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3
drivers/ide/ide-ioctls.c
View File

@ -19,7 +19,6 @@ int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
const struct ide_ioctl_devset *s)
{
const struct ide_devset *ds;
unsigned long flags;
int err = -EOPNOTSUPP;
for (; (ds = s->setting); s++) {
@ -33,9 +32,7 @@ int ide_setting_ioctl(ide_drive_t *drive, struct block_device *bdev,
read_val:
mutex_lock(&ide_setting_mtx);
spin_lock_irqsave(&ide_lock, flags);
err = ds->get(drive);
spin_unlock_irqrestore(&ide_lock, flags);
mutex_unlock(&ide_setting_mtx);
return err >= 0 ? put_user(err, (long __user *)arg) : err;

25
drivers/ide/ide-proc.c
View File

@ -155,13 +155,8 @@ static int ide_read_setting(ide_drive_t *drive,
const struct ide_devset *ds = setting->setting;
int val = -EINVAL;
if (ds->get) {
unsigned long flags;
spin_lock_irqsave(&ide_lock, flags);
if (ds->get)
val = ds->get(drive);
spin_unlock_irqrestore(&ide_lock, flags);
}
return val;
}
@ -583,31 +578,19 @@ EXPORT_SYMBOL(ide_proc_register_driver);
* Clean up the driver specific /proc files and IDE settings
* for a given drive.
*
* Takes ide_setting_mtx and ide_lock.
* Caller must hold none of the locks.
* Takes ide_setting_mtx.
*/
void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver)
{
unsigned long flags;
ide_remove_proc_entries(drive->proc, driver->proc_entries(drive));
mutex_lock(&ide_setting_mtx);
spin_lock_irqsave(&ide_lock, flags);
/*
* ide_setting_mtx protects the settings list
* ide_lock protects the use of settings
*
* so we need to hold both, ide_settings_sem because we want to
* modify the settings list, and ide_lock because we cannot take
* a setting out that is being used.
*
* OTOH both ide_{read,write}_setting are only ever used under
* ide_setting_mtx.
* ide_setting_mtx protects both the settings list and the use
* of settings (we cannot take a setting out that is being used).
*/
drive->settings = NULL;
spin_unlock_irqrestore(&ide_lock, flags);
mutex_unlock(&ide_setting_mtx);
}
EXPORT_SYMBOL(ide_proc_unregister_driver);