Commit 3d5d30fe authored by Jan Kiszka's avatar Jan Kiszka Committed by David S. Miller
Browse files

CAPI: Clean up capiminors_lock 



Use a plain spin lock for capiminors_lock, drop inconsistent irqsafe
acquisitions (it's only used in process context anyway).

Signed-off-by: default avatarJan Kiszka <jan.kiszka@web.de>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 6576c289

drivers/isdn/capi/capi.c

+9 −12
Original line number Diff line number Diff line
@@ -149,7 +149,7 @@ static LIST_HEAD(capidev_list); 


#ifdef CONFIG_ISDN_CAPI_MIDDLEWARE



static DEFINE_RWLOCK(capiminors_lock);

static DEFINE_SPINLOCK(capiminors_lock);

static struct capiminor **capiminors;



static struct tty_driver *capinc_tty_driver;
@@ -218,7 +218,6 @@ static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci) 
	struct capiminor *mp;

	struct device *dev;

	unsigned int minor;

	unsigned long flags;



	mp = kzalloc(sizeof(*mp), GFP_KERNEL);

  	if (!mp) {
@@ -242,13 +241,13 @@ static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci) 
	mp->port.ops = &capiminor_port_ops;



	/* Allocate the least unused minor number. */

	write_lock_irqsave(&capiminors_lock, flags);

	spin_lock(&capiminors_lock);

	for (minor = 0; minor < capi_ttyminors; minor++)

		if (!capiminors[minor]) {

			capiminors[minor] = mp;

			break;

		}

	write_unlock_irqrestore(&capiminors_lock, flags);

	spin_unlock(&capiminors_lock);



	if (minor == capi_ttyminors) {

		printk(KERN_NOTICE "capi: out of minors\n");
@@ -264,9 +263,9 @@ static struct capiminor *capiminor_alloc(struct capi20_appl *ap, u32 ncci) 
	return mp;



err_out2:

	write_lock_irqsave(&capiminors_lock, flags);

	spin_lock(&capiminors_lock);

	capiminors[minor] = NULL;

	write_unlock_irqrestore(&capiminors_lock, flags);

	spin_unlock(&capiminors_lock);



err_out1:

	kfree(mp);
@@ -288,11 +287,11 @@ static struct capiminor *capiminor_get(unsigned int minor) 
{

	struct capiminor *mp;



	read_lock(&capiminors_lock);

	spin_lock(&capiminors_lock);

	mp = capiminors[minor];

	if (mp)

		kref_get(&mp->kref);

	read_unlock(&capiminors_lock);

	spin_unlock(&capiminors_lock);



	return mp;

}
@@ -304,13 +303,11 @@ static inline void capiminor_put(struct capiminor *mp) 


static void capiminor_free(struct capiminor *mp)

{

	unsigned long flags;



	tty_unregister_device(capinc_tty_driver, mp->minor);



	write_lock_irqsave(&capiminors_lock, flags);

	spin_lock(&capiminors_lock);

	capiminors[mp->minor] = NULL;

	write_unlock_irqrestore(&capiminors_lock, flags);

	spin_unlock(&capiminors_lock);



	capiminor_put(mp);

}