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[IA64-SGI] sem2mutex ioc4.c

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Convert to use a single mutex instead of two rwsems as this isn't
performance critical.

Signed-off-by: Jes Sorensen <jes@sgi.com>
Signed-off-by: Brent Casavant <bcasavan@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Jes Sorensen 2006-01-17 12:24:39 -05:00 • committed by Tony Luck
parent 3ee68c4af3
commit 6e586f3293
1 changed files with 18 additions and 23 deletions
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41
drivers/sn/ioc4.c
View file

@ -31,7 +31,7 @@
#include <linux/ioc4.h>
#include <linux/mmtimer.h>
#include <linux/rtc.h>
#include <linux/rwsem.h>
#include <linux/mutex.h>
#include <asm/sn/addrs.h>
#include <asm/sn/clksupport.h>
#include <asm/sn/shub_mmr.h>
@ -54,11 +54,10 @@
* Submodule management *
************************/
static LIST_HEAD(ioc4_devices);
static DECLARE_RWSEM(ioc4_devices_rwsem);
static DEFINE_MUTEX(ioc4_mutex);
static LIST_HEAD(ioc4_devices);
static LIST_HEAD(ioc4_submodules);
static DECLARE_RWSEM(ioc4_submodules_rwsem);
/* Register an IOC4 submodule */
int
@ -66,15 +65,13 @@ ioc4_register_submodule(struct ioc4_submodule *is)
{
struct ioc4_driver_data *idd;
down_write(&ioc4_submodules_rwsem);
mutex_lock(&ioc4_mutex);
list_add(&is->is_list, &ioc4_submodules);
up_write(&ioc4_submodules_rwsem);
/* Initialize submodule for each IOC4 */
if (!is->is_probe)
return 0;
goto out;
down_read(&ioc4_devices_rwsem);
list_for_each_entry(idd, &ioc4_devices, idd_list) {
if (is->is_probe(idd)) {
printk(KERN_WARNING
@ -84,8 +81,8 @@ ioc4_register_submodule(struct ioc4_submodule *is)
pci_name(idd->idd_pdev));
}
}
up_read(&ioc4_devices_rwsem);
out:
mutex_unlock(&ioc4_mutex);
return 0;
}
@ -95,15 +92,13 @@ ioc4_unregister_submodule(struct ioc4_submodule *is)
{
struct ioc4_driver_data *idd;
down_write(&ioc4_submodules_rwsem);
mutex_lock(&ioc4_mutex);
list_del(&is->is_list);
up_write(&ioc4_submodules_rwsem);
/* Remove submodule for each IOC4 */
if (!is->is_remove)
return;
goto out;
down_read(&ioc4_devices_rwsem);
list_for_each_entry(idd, &ioc4_devices, idd_list) {
if (is->is_remove(idd)) {
printk(KERN_WARNING
@ -113,7 +108,8 @@ ioc4_unregister_submodule(struct ioc4_submodule *is)
pci_name(idd->idd_pdev));
}
}
up_read(&ioc4_devices_rwsem);
out:
mutex_unlock(&ioc4_mutex);
}
/*********************
@ -312,12 +308,11 @@ ioc4_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
/* Track PCI-device specific data */
idd->idd_serial_data = NULL;
pci_set_drvdata(idd->idd_pdev, idd);
down_write(&ioc4_devices_rwsem);
mutex_lock(&ioc4_mutex);
list_add(&idd->idd_list, &ioc4_devices);
up_write(&ioc4_devices_rwsem);
/* Add this IOC4 to all submodules */
down_read(&ioc4_submodules_rwsem);
list_for_each_entry(is, &ioc4_submodules, is_list) {
if (is->is_probe && is->is_probe(idd)) {
printk(KERN_WARNING
@ -327,7 +322,7 @@ ioc4_probe(struct pci_dev *pdev, const struct pci_device_id *pci_id)
pci_name(idd->idd_pdev));
}
}
up_read(&ioc4_submodules_rwsem);
mutex_unlock(&ioc4_mutex);
return 0;
@ -351,7 +346,7 @@ ioc4_remove(struct pci_dev *pdev)
idd = pci_get_drvdata(pdev);
/* Remove this IOC4 from all submodules */
down_read(&ioc4_submodules_rwsem);
mutex_lock(&ioc4_mutex);
list_for_each_entry(is, &ioc4_submodules, is_list) {
if (is->is_remove && is->is_remove(idd)) {
printk(KERN_WARNING
@ -361,7 +356,7 @@ ioc4_remove(struct pci_dev *pdev)
pci_name(idd->idd_pdev));
}
}
up_read(&ioc4_submodules_rwsem);
mutex_unlock(&ioc4_mutex);
/* Release resources */
iounmap(idd->idd_misc_regs);
@ -377,9 +372,9 @@ ioc4_remove(struct pci_dev *pdev)
pci_disable_device(pdev);
/* Remove and free driver data */
down_write(&ioc4_devices_rwsem);
mutex_lock(&ioc4_mutex);
list_del(&idd->idd_list);
up_write(&ioc4_devices_rwsem);
mutex_unlock(&ioc4_mutex);
kfree(idd);
}