[PATCH] ide: use mutex instead of ide_setting_sem semaphore in IDE driver From: Matthias Kaehlcke The IDE driver uses a semaphore as mutex. Use the mutex API instead of the (binary) semaphore. Signed-off-by: Matthias Kaehlcke Signed-off-by: Bartlomiej Zolnierkiewicz -- diff --git a/drivers/ide/ide-disk.c b/drivers/ide/ide-disk.c index 7fff773..af67fd2 100644 --- a/drivers/ide/ide-disk.c +++ b/drivers/ide/ide-disk.c @@ -1178,11 +1178,11 @@ static int idedisk_ioctl(struct inode *inode, struct file *file, return generic_ide_ioctl(drive, file, bdev, cmd, arg); read_val: - down(&ide_setting_sem); + mutex_lock(&ide_setting_mtx); spin_lock_irqsave(&ide_lock, flags); err = *val; spin_unlock_irqrestore(&ide_lock, flags); - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); return err >= 0 ? put_user(err, (long __user *)arg) : err; set_val: @@ -1192,9 +1192,9 @@ set_val: if (!capable(CAP_SYS_ADMIN)) err = -EACCES; else { - down(&ide_setting_sem); + mutex_lock(&ide_setting_mtx); err = setfunc(drive, arg); - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); } } return err; diff --git a/drivers/ide/ide-proc.c b/drivers/ide/ide-proc.c index d50bd99..33907c6 100644 --- a/drivers/ide/ide-proc.c +++ b/drivers/ide/ide-proc.c @@ -154,7 +154,7 @@ static int __ide_add_setting(ide_drive_t *drive, const char *name, int rw, int d { ide_settings_t **p = (ide_settings_t **) &drive->settings, *setting = NULL; - down(&ide_setting_sem); + mutex_lock(&ide_setting_mtx); while ((*p) && strcmp((*p)->name, name) < 0) p = &((*p)->next); if ((setting = kzalloc(sizeof(*setting), GFP_KERNEL)) == NULL) @@ -175,10 +175,10 @@ static int __ide_add_setting(ide_drive_t *drive, const char *name, int rw, int d if (auto_remove) setting->auto_remove = 1; *p = setting; - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); return 0; abort: - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); kfree(setting); return -1; } @@ -222,7 +222,7 @@ static void __ide_remove_setting (ide_drive_t *drive, char *name) * * Automatically remove all the driver specific settings for this * drive. This function may not be called from IRQ context. The - * caller must hold ide_setting_sem. + * caller must hold ide_setting_mtx. */ static void auto_remove_settings (ide_drive_t *drive) @@ -267,7 +267,7 @@ static ide_settings_t *ide_find_setting_by_name(ide_drive_t *drive, char *name) * @setting: drive setting * * Read a drive setting and return the value. The caller - * must hold the ide_setting_sem when making this call. + * must hold the ide_setting_mtx when making this call. * * BUGS: the data return and error are the same return value * so an error -EINVAL and true return of the same value cannot @@ -304,7 +304,7 @@ static int ide_read_setting(ide_drive_t *drive, ide_settings_t *setting) * @val: value * * Write a drive setting if it is possible. The caller - * must hold the ide_setting_sem when making this call. + * must hold the ide_setting_mtx when making this call. * * BUGS: the data return and error are the same return value * so an error -EINVAL and true return of the same value cannot @@ -365,7 +365,7 @@ static int set_xfer_rate (ide_drive_t *drive, int arg) * @drive: drive being configured * * Add the generic parts of the system settings to the /proc files. - * The caller must not be holding the ide_setting_sem. + * The caller must not be holding the ide_setting_mtx. */ void ide_add_generic_settings (ide_drive_t *drive) @@ -406,7 +406,7 @@ static int proc_ide_read_settings proc_ide_settings_warn(); - down(&ide_setting_sem); + mutex_lock(&ide_setting_mtx); out += sprintf(out, "name\t\t\tvalue\t\tmin\t\tmax\t\tmode\n"); out += sprintf(out, "----\t\t\t-----\t\t---\t\t---\t\t----\n"); while(setting) { @@ -426,7 +426,7 @@ static int proc_ide_read_settings setting = setting->next; } len = out - page; - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); PROC_IDE_READ_RETURN(page,start,off,count,eof,len); } @@ -506,16 +506,16 @@ static int proc_ide_write_settings(struct file *file, const char __user *buffer, ++p; } - down(&ide_setting_sem); + mutex_lock(&ide_setting_mtx); setting = ide_find_setting_by_name(drive, name); if (!setting) { - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); goto parse_error; } if (for_real) ide_write_setting(drive, setting, val * setting->div_factor / setting->mul_factor); - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); } } while (!for_real++); free_page((unsigned long)buf); @@ -703,7 +703,7 @@ EXPORT_SYMBOL(ide_proc_register_driver); * Clean up the driver specific /proc files and IDE settings * for a given drive. * - * Takes ide_setting_sem and ide_lock. + * Takes ide_setting_mtx and ide_lock. * Caller must hold none of the locks. */ @@ -713,10 +713,10 @@ void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver) ide_remove_proc_entries(drive->proc, driver->proc); - down(&ide_setting_sem); + mutex_lock(&ide_setting_mtx); spin_lock_irqsave(&ide_lock, flags); /* - * ide_setting_sem protects the settings list + * 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 @@ -724,11 +724,11 @@ void ide_proc_unregister_driver(ide_drive_t *drive, ide_driver_t *driver) * a setting out that is being used. * * OTOH both ide_{read,write}_setting are only ever used under - * ide_setting_sem. + * ide_setting_mtx. */ auto_remove_settings(drive); spin_unlock_irqrestore(&ide_lock, flags); - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); } EXPORT_SYMBOL(ide_proc_unregister_driver); diff --git a/drivers/ide/ide.c b/drivers/ide/ide.c index f2b547f..4811c61 100644 --- a/drivers/ide/ide.c +++ b/drivers/ide/ide.c @@ -817,9 +817,9 @@ EXPORT_SYMBOL(ide_register_hw); * Locks for IDE setting functionality */ -DECLARE_MUTEX(ide_setting_sem); +DEFINE_MUTEX(ide_setting_mtx); -EXPORT_SYMBOL_GPL(ide_setting_sem); +EXPORT_SYMBOL_GPL(ide_setting_mtx); /** * ide_spin_wait_hwgroup - wait for group @@ -1181,11 +1181,11 @@ int generic_ide_ioctl(ide_drive_t *drive, struct file *file, struct block_device } read_val: - down(&ide_setting_sem); + mutex_lock(&ide_setting_mtx); spin_lock_irqsave(&ide_lock, flags); err = *val; spin_unlock_irqrestore(&ide_lock, flags); - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); return err >= 0 ? put_user(err, (long __user *)arg) : err; set_val: @@ -1195,9 +1195,9 @@ set_val: if (!capable(CAP_SYS_ADMIN)) err = -EACCES; else { - down(&ide_setting_sem); + mutex_lock(&ide_setting_mtx); err = setfunc(drive, arg); - up(&ide_setting_sem); + mutex_unlock(&ide_setting_mtx); } } return err; diff --git a/include/linux/ide.h b/include/linux/ide.h index df4e6a5..3773a5b 100644 --- a/include/linux/ide.h +++ b/include/linux/ide.h @@ -25,6 +25,7 @@ #include #include #include +#include /****************************************************************************** * IDE driver configuration options (play with these as desired): @@ -863,7 +864,7 @@ typedef struct hwgroup_s { typedef struct ide_driver_s ide_driver_t; -extern struct semaphore ide_setting_sem; +extern struct mutex ide_setting_mtx; int set_io_32bit(ide_drive_t *, int); int set_pio_mode(ide_drive_t *, int);