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Commit 9717fb8b authored by Jan Kiszka's avatar Jan Kiszka Committed by David S. Miller
Browse files

CAPI: Convert capi drivers rwlock into mutex 



Turn the lock protecting registered capi drivers into a mutex and apply
it consistently.

Signed-off-by: default avatarJan Kiszka <jan.kiszka@web.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 52253031

drivers/isdn/capi/kcapi.c

+22 −27
Original line number Diff line number Diff line
@@ -61,7 +61,7 @@ static char capi_manufakturer[64] = "AVM Berlin"; 
#define NCCI2CTRL(ncci)    (((ncci) >> 24) & 0x7f)



LIST_HEAD(capi_drivers);

DEFINE_RWLOCK(capi_drivers_list_lock);

DEFINE_MUTEX(capi_drivers_lock);



static DEFINE_RWLOCK(application_lock);

static DEFINE_MUTEX(controller_mutex);
@@ -540,11 +540,9 @@ EXPORT_SYMBOL(detach_capi_ctr); 


void register_capi_driver(struct capi_driver *driver)

{

	unsigned long flags;



	write_lock_irqsave(&capi_drivers_list_lock, flags);

	mutex_lock(&capi_drivers_lock);

	list_add_tail(&driver->list, &capi_drivers);

	write_unlock_irqrestore(&capi_drivers_list_lock, flags);

	mutex_unlock(&capi_drivers_lock);

}



EXPORT_SYMBOL(register_capi_driver);
@@ -558,11 +556,9 @@ EXPORT_SYMBOL(register_capi_driver); 


void unregister_capi_driver(struct capi_driver *driver)

{

	unsigned long flags;



	write_lock_irqsave(&capi_drivers_list_lock, flags);

	mutex_lock(&capi_drivers_lock);

	list_del(&driver->list);

	write_unlock_irqrestore(&capi_drivers_list_lock, flags);

	mutex_unlock(&capi_drivers_lock);

}



EXPORT_SYMBOL(unregister_capi_driver);
@@ -899,7 +895,6 @@ static int old_capi_manufacturer(unsigned int cmd, void __user *data) 
	struct capi_driver *driver = NULL;

	capiloaddata ldata;

	struct list_head *l;

	unsigned long flags;

	int retval;



	switch (cmd) {
@@ -919,7 +914,8 @@ static int old_capi_manufacturer(unsigned int cmd, void __user *data) 
		cparams.irq = cdef.irq;

		cparams.cardnr = cdef.cardnr;



		read_lock_irqsave(&capi_drivers_list_lock, flags);

		mutex_lock(&capi_drivers_lock);



                switch (cdef.cardtype) {

			case AVM_CARDTYPE_B1:

				list_for_each(l, &capi_drivers) {
@@ -940,18 +936,15 @@ static int old_capi_manufacturer(unsigned int cmd, void __user *data) 
				break;

		}

		if (!driver) {

			read_unlock_irqrestore(&capi_drivers_list_lock, flags);

			printk(KERN_ERR "kcapi: driver not loaded.\n");

			return -EIO;

		}

		if (!driver->add_card) {

			read_unlock_irqrestore(&capi_drivers_list_lock, flags);

			retval = -EIO;

		} else if (!driver->add_card) {

			printk(KERN_ERR "kcapi: driver has no add card function.\n");

			return -EIO;

		}



			retval = -EIO;

		} else

			retval = driver->add_card(driver, &cparams);

		read_unlock_irqrestore(&capi_drivers_list_lock, flags);



		mutex_unlock(&capi_drivers_lock);

		return retval;



	case AVMB1_LOAD:
@@ -1107,6 +1100,8 @@ int capi20_manufacturer(unsigned int cmd, void __user *data) 
		cparams.cardtype = 0;

		cdef.driver[sizeof(cdef.driver)-1] = 0;



		mutex_lock(&capi_drivers_lock);



		list_for_each(l, &capi_drivers) {

			driver = list_entry(l, struct capi_driver, list);

			if (strcmp(driver->name, cdef.driver) == 0)
@@ -1115,15 +1110,15 @@ int capi20_manufacturer(unsigned int cmd, void __user *data) 
		if (driver == NULL) {

			printk(KERN_ERR "kcapi: driver \"%s\" not loaded.\n",

					cdef.driver);

			return -ESRCH;

		}



		if (!driver->add_card) {

			retval = -ESRCH;

		} else if (!driver->add_card) {

			printk(KERN_ERR "kcapi: driver \"%s\" has no add card function.\n", cdef.driver);

			return -EIO;

		}

			retval = -EIO;

		} else

			retval = driver->add_card(driver, &cparams);



		return driver->add_card(driver, &cparams);

		mutex_unlock(&capi_drivers_lock);

		return retval;

	}



	default:

drivers/isdn/capi/kcapi.h

+1 −1
Original line number Diff line number Diff line
@@ -30,7 +30,7 @@ enum { 
};



extern struct list_head capi_drivers;

extern rwlock_t capi_drivers_list_lock;

extern struct mutex capi_drivers_lock;



extern struct capi20_appl *capi_applications[CAPI_MAXAPPL];

extern struct capi_ctr *capi_controller[CAPI_MAXCONTR];

drivers/isdn/capi/kcapi_proc.c

+4 −4
Original line number Diff line number Diff line
@@ -238,9 +238,9 @@ static const struct file_operations proc_applstats_ops = { 
// ---------------------------------------------------------------------------



static void *capi_driver_start(struct seq_file *seq, loff_t *pos)

	__acquires(&capi_drivers_list_lock)

	__acquires(&capi_drivers_lock)

{

	read_lock(&capi_drivers_list_lock);

	mutex_lock(&capi_drivers_lock);

	return seq_list_start(&capi_drivers, *pos);

}
@@ -250,9 +250,9 @@ static void *capi_driver_next(struct seq_file *seq, void *v, loff_t *pos) 
}



static void capi_driver_stop(struct seq_file *seq, void *v)

	__releases(&capi_drivers_list_lock)

	__releases(&capi_drivers_lock)

{

	read_unlock(&capi_drivers_list_lock);

	mutex_unlock(&capi_drivers_lock);

}



static int capi_driver_show(struct seq_file *seq, void *v)