diff options
Diffstat (limited to 'drivers/sn/ioc4.c')
| -rw-r--r-- | drivers/sn/ioc4.c | 41 |
1 files changed, 18 insertions, 23 deletions
diff --git a/drivers/sn/ioc4.c b/drivers/sn/ioc4.c index ea75b3d0612..67140a5804f 100644 --- a/drivers/sn/ioc4.c +++ b/drivers/sn/ioc4.c @@ -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); } |