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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2013-01-31 19:55:17 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-02-14 15:55:17 +0100 |
| commit | 53923354d69e4748506bfee932b7c6b309a15c21 (patch) | |
| tree | 3d6e2d0fac4f26f53cbff549ad31b0032006c99d /arch/s390 | |
| parent | add09d61fee72d7a346051332b6d99f18989504c (diff) | |
| download | linux-3.10-53923354d69e4748506bfee932b7c6b309a15c21.tar.gz linux-3.10-53923354d69e4748506bfee932b7c6b309a15c21.tar.bz2 linux-3.10-53923354d69e4748506bfee932b7c6b309a15c21.zip | |
s390/pci: fix hotplug module init
Loading the pci hotplug module when no devices are present will fail
but unfortunately some hotplug callbacks stay registered to the pci
bus level. Fix this by not letting module loading fail when no pci
devices are present and provide proper {de}registration functions
for these callbacks.
Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/pci.h | 4 | ||||
| -rw-r--r-- | arch/s390/pci/pci.c | 27 |
2 files changed, 24 insertions, 7 deletions
diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h index 6383c44c662..05333b7f046 100644 --- a/arch/s390/include/asm/pci.h +++ b/arch/s390/include/asm/pci.h @@ -185,9 +185,11 @@ void zpci_dma_exit(void); /* Hotplug */ extern struct mutex zpci_list_lock; extern struct list_head zpci_list; -extern struct pci_hp_callback_ops hotplug_ops; extern unsigned int s390_pci_probe; +void zpci_register_hp_ops(struct pci_hp_callback_ops *); +void zpci_deregister_hp_ops(void); + /* FMB */ int zpci_fmb_enable_device(struct zpci_dev *); int zpci_fmb_disable_device(struct zpci_dev *); diff --git a/arch/s390/pci/pci.c b/arch/s390/pci/pci.c index aa74409db65..27b4c17855b 100644 --- a/arch/s390/pci/pci.c +++ b/arch/s390/pci/pci.c @@ -51,8 +51,7 @@ EXPORT_SYMBOL_GPL(zpci_list); DEFINE_MUTEX(zpci_list_lock); EXPORT_SYMBOL_GPL(zpci_list_lock); -struct pci_hp_callback_ops hotplug_ops; -EXPORT_SYMBOL_GPL(hotplug_ops); +static struct pci_hp_callback_ops *hotplug_ops; static DECLARE_BITMAP(zpci_domain, ZPCI_NR_DEVICES); static DEFINE_SPINLOCK(zpci_domain_lock); @@ -974,8 +973,8 @@ int zpci_create_device(struct zpci_dev *zdev) mutex_lock(&zpci_list_lock); list_add_tail(&zdev->entry, &zpci_list); - if (hotplug_ops.create_slot) - hotplug_ops.create_slot(zdev); + if (hotplug_ops) + hotplug_ops->create_slot(zdev); mutex_unlock(&zpci_list_lock); if (zdev->state == ZPCI_FN_STATE_STANDBY) @@ -989,8 +988,8 @@ int zpci_create_device(struct zpci_dev *zdev) out_start: mutex_lock(&zpci_list_lock); list_del(&zdev->entry); - if (hotplug_ops.remove_slot) - hotplug_ops.remove_slot(zdev); + if (hotplug_ops) + hotplug_ops->remove_slot(zdev); mutex_unlock(&zpci_list_lock); out_bus: zpci_free_domain(zdev); @@ -1072,6 +1071,22 @@ static void zpci_mem_exit(void) kmem_cache_destroy(zdev_fmb_cache); } +void zpci_register_hp_ops(struct pci_hp_callback_ops *ops) +{ + mutex_lock(&zpci_list_lock); + hotplug_ops = ops; + mutex_unlock(&zpci_list_lock); +} +EXPORT_SYMBOL_GPL(zpci_register_hp_ops); + +void zpci_deregister_hp_ops(void) +{ + mutex_lock(&zpci_list_lock); + hotplug_ops = NULL; + mutex_unlock(&zpci_list_lock); +} +EXPORT_SYMBOL_GPL(zpci_deregister_hp_ops); + unsigned int s390_pci_probe = 1; EXPORT_SYMBOL_GPL(s390_pci_probe); |