From: Rafael J. Wysocki Date: Wed, 18 Mar 2015 21:39:55 +0000 (+0100) Subject: PNP: Convert pnp_lock into a mutex X-Git-Tag: firefly_0821_release~176^2~1977^2~4^2~1 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=38f6b38dbb0896511c509fbb6ceabbedbee8e87d;p=firefly-linux-kernel-4.4.55.git PNP: Convert pnp_lock into a mutex pnp_lock is a spinlock, but it is only acquired from process context, so it may be a mutex just fine. Signed-off-by: Rafael J. Wysocki --- diff --git a/drivers/pnp/base.h b/drivers/pnp/base.h index c8873b0ca551..3151fd164614 100644 --- a/drivers/pnp/base.h +++ b/drivers/pnp/base.h @@ -3,7 +3,7 @@ * Bjorn Helgaas */ -extern spinlock_t pnp_lock; +extern struct mutex pnp_lock; extern const struct attribute_group *pnp_dev_groups[]; void *pnp_alloc(long size); diff --git a/drivers/pnp/card.c b/drivers/pnp/card.c index 874c236ac1a7..31ad9fc3f701 100644 --- a/drivers/pnp/card.c +++ b/drivers/pnp/card.c @@ -5,6 +5,7 @@ */ #include +#include #include #include #include @@ -244,10 +245,10 @@ int pnp_add_card(struct pnp_card *card) } pnp_interface_attach_card(card); - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); list_add_tail(&card->global_list, &pnp_cards); list_add_tail(&card->protocol_list, &card->protocol->cards); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); /* we wait until now to add devices in order to ensure the drivers * will be able to use all of the related devices on the card @@ -276,10 +277,10 @@ void pnp_remove_card(struct pnp_card *card) struct list_head *pos, *temp; device_unregister(&card->dev); - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); list_del(&card->global_list); list_del(&card->protocol_list); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); list_for_each_safe(pos, temp, &card->devices) { struct pnp_dev *dev = card_to_pnp_dev(pos); pnp_remove_card_device(dev); @@ -297,10 +298,10 @@ int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev) dev->card_link = NULL; dev_set_name(&dev->dev, "%02x:%02x.%02x", dev->protocol->number, card->number, dev->number); - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); dev->card = card; list_add_tail(&dev->card_list, &card->devices); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); return 0; } @@ -310,10 +311,10 @@ int pnp_add_card_device(struct pnp_card *card, struct pnp_dev *dev) */ void pnp_remove_card_device(struct pnp_dev *dev) { - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); dev->card = NULL; list_del(&dev->card_list); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); __pnp_remove_device(dev); } @@ -426,9 +427,9 @@ int pnp_register_card_driver(struct pnp_card_driver *drv) if (error < 0) return error; - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); list_add_tail(&drv->global_list, &pnp_card_drivers); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); list_for_each_safe(pos, temp, &pnp_cards) { struct pnp_card *card = @@ -444,9 +445,9 @@ int pnp_register_card_driver(struct pnp_card_driver *drv) */ void pnp_unregister_card_driver(struct pnp_card_driver *drv) { - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); list_del(&drv->global_list); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); pnp_unregister_driver(&drv->link); } diff --git a/drivers/pnp/core.c b/drivers/pnp/core.c index cb6ce42f8e77..ef2f59c4e57c 100644 --- a/drivers/pnp/core.c +++ b/drivers/pnp/core.c @@ -9,6 +9,7 @@ #include #include #include +#include #include #include #include @@ -19,7 +20,7 @@ static LIST_HEAD(pnp_protocols); LIST_HEAD(pnp_global); -DEFINE_SPINLOCK(pnp_lock); +DEFINE_MUTEX(pnp_lock); /* * ACPI or PNPBIOS should tell us about all platform devices, so we can @@ -55,7 +56,7 @@ int pnp_register_protocol(struct pnp_protocol *protocol) INIT_LIST_HEAD(&protocol->devices); INIT_LIST_HEAD(&protocol->cards); nodenum = 0; - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); /* assign the lowest unused number */ list_for_each(pos, &pnp_protocols) { @@ -67,7 +68,7 @@ int pnp_register_protocol(struct pnp_protocol *protocol) } list_add_tail(&protocol->protocol_list, &pnp_protocols); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); protocol->number = nodenum; dev_set_name(&protocol->dev, "pnp%d", nodenum); @@ -80,9 +81,9 @@ int pnp_register_protocol(struct pnp_protocol *protocol) */ void pnp_unregister_protocol(struct pnp_protocol *protocol) { - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); list_del(&protocol->protocol_list); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); device_unregister(&protocol->dev); } @@ -161,10 +162,10 @@ int __pnp_add_device(struct pnp_dev *dev) { pnp_fixup_device(dev); dev->status = PNP_READY; - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); list_add_tail(&dev->global_list, &pnp_global); list_add_tail(&dev->protocol_list, &dev->protocol->devices); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); if (dev->protocol->can_wakeup) device_set_wakeup_capable(&dev->dev, dev->protocol->can_wakeup(dev)); @@ -203,10 +204,10 @@ int pnp_add_device(struct pnp_dev *dev) void __pnp_remove_device(struct pnp_dev *dev) { - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); list_del(&dev->global_list); list_del(&dev->protocol_list); - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); device_unregister(&dev->dev); } diff --git a/drivers/pnp/driver.c b/drivers/pnp/driver.c index 4e57d3370368..153a493b5413 100644 --- a/drivers/pnp/driver.c +++ b/drivers/pnp/driver.c @@ -58,22 +58,22 @@ static const struct pnp_device_id *match_device(struct pnp_driver *drv, int pnp_device_attach(struct pnp_dev *pnp_dev) { - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); if (pnp_dev->status != PNP_READY) { - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); return -EBUSY; } pnp_dev->status = PNP_ATTACHED; - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); return 0; } void pnp_device_detach(struct pnp_dev *pnp_dev) { - spin_lock(&pnp_lock); + mutex_lock(&pnp_lock); if (pnp_dev->status == PNP_ATTACHED) pnp_dev->status = PNP_READY; - spin_unlock(&pnp_lock); + mutex_unlock(&pnp_lock); pnp_disable_dev(pnp_dev); }