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Date: Mon, 8 Feb 2010 21:12:11 +0100
From: Jan Kiszka <jan.kiszka@....de>
To: David Miller <davem@...emloft.net>,
Karsten Keil <isdn@...ux-pingi.de>
Cc: linux-kernel@...r.kernel.org, i4ldeveloper@...tserv.isdn4linux.de,
isdn4linux@...tserv.isdn4linux.de, netdev@...r.kernel.org,
Alan Cox <alan@...rguk.ukuu.org.uk>,
Marcel Holtmann <marcel@...tmann.org>
Subject: [PATCH v2 07/41] CAPI: Convert capi drivers rwlock into mutex
Turn the lock protecting registered capi drivers into a mutex and apply
it consistently.
Signed-off-by: Jan Kiszka <jan.kiszka@....de>
---
drivers/isdn/capi/kcapi.c | 49 ++++++++++++++++++----------------------
drivers/isdn/capi/kcapi.h | 2 +-
drivers/isdn/capi/kcapi_proc.c | 8 +++---
3 files changed, 27 insertions(+), 32 deletions(-)
diff --git a/drivers/isdn/capi/kcapi.c b/drivers/isdn/capi/kcapi.c
index f37c13b..c46964f 100644
--- a/drivers/isdn/capi/kcapi.c
+++ b/drivers/isdn/capi/kcapi.c
@@ -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);
- 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:
diff --git a/drivers/isdn/capi/kcapi.h b/drivers/isdn/capi/kcapi.h
index f62c53b..07c5850 100644
--- a/drivers/isdn/capi/kcapi.h
+++ b/drivers/isdn/capi/kcapi.h
@@ -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];
diff --git a/drivers/isdn/capi/kcapi_proc.c b/drivers/isdn/capi/kcapi_proc.c
index 59fd16a..71b0761 100644
--- a/drivers/isdn/capi/kcapi_proc.c
+++ b/drivers/isdn/capi/kcapi_proc.c
@@ -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)
--
1.6.0.2
--
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