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Subject[PATCH v2 29/41] CAPI: Clean up capiminors_lock
Date
Use a plain spin lock for capiminors_lock, drop inconsistent irqsafe
acquisitions (it's only used in process context anyway).

Signed-off-by: Jan Kiszka <jan.kiszka@web.de>
---
drivers/isdn/capi/capi.c | 21 +++++++++------------
1 files changed, 9 insertions(+), 12 deletions(-)
diff --git a/drivers/isdn/capi/capi.c b/drivers/isdn/capi/capi.c
index cf5e996..0b264b4 100644
--- a/drivers/isdn/capi/capi.c
+++ b/drivers/isdn/capi/capi.c
@@ -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);
}
--
1.6.0.2


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