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PCI: Convert pci_lock to raw_spinlock

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pci_lock must be a real spinlock in preempt-rt. Convert it to
raw_spinlock. No change for !RT kernels.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
This commit is contained in:
Thomas Gleixner 2010-02-17 14:35:19 +00:00 committed by Jesse Barnes
parent 52b265a127
commit 511dd98ce8
1 changed files with 17 additions and 17 deletions
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34
drivers/pci/access.c
View file

@ -13,7 +13,7 @@
* configuration space.
*/
static DEFINE_SPINLOCK(pci_lock);
static DEFINE_RAW_SPINLOCK(pci_lock);
/*
* Wrappers for all PCI configuration access functions. They just check
@ -33,10 +33,10 @@ int pci_bus_read_config_##size \
unsigned long flags; \
u32 data = 0; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
spin_lock_irqsave(&pci_lock, flags); \
raw_spin_lock_irqsave(&pci_lock, flags); \
res = bus->ops->read(bus, devfn, pos, len, &data); \
*value = (type)data; \
spin_unlock_irqrestore(&pci_lock, flags); \
raw_spin_unlock_irqrestore(&pci_lock, flags); \
return res; \
}
@ -47,9 +47,9 @@ int pci_bus_write_config_##size \
int res; \
unsigned long flags; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
spin_lock_irqsave(&pci_lock, flags); \
raw_spin_lock_irqsave(&pci_lock, flags); \
res = bus->ops->write(bus, devfn, pos, len, value); \
spin_unlock_irqrestore(&pci_lock, flags); \
raw_spin_unlock_irqrestore(&pci_lock, flags); \
return res; \
}
@ -79,10 +79,10 @@ struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops)
struct pci_ops *old_ops;
unsigned long flags;
spin_lock_irqsave(&pci_lock, flags);
raw_spin_lock_irqsave(&pci_lock, flags);
old_ops = bus->ops;
bus->ops = ops;
spin_unlock_irqrestore(&pci_lock, flags);
raw_spin_unlock_irqrestore(&pci_lock, flags);
return old_ops;
}
EXPORT_SYMBOL(pci_bus_set_ops);
@ -136,9 +136,9 @@ static noinline void pci_wait_ucfg(struct pci_dev *dev)
__add_wait_queue(&pci_ucfg_wait, &wait);
do {
set_current_state(TASK_UNINTERRUPTIBLE);
spin_unlock_irq(&pci_lock);
raw_spin_unlock_irq(&pci_lock);
schedule();
spin_lock_irq(&pci_lock);
raw_spin_lock_irq(&pci_lock);
} while (dev->block_ucfg_access);
__remove_wait_queue(&pci_ucfg_wait, &wait);
}
@ -150,11 +150,11 @@ int pci_user_read_config_##size \
int ret = 0; \
u32 data = -1; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
spin_lock_irq(&pci_lock); \
raw_spin_lock_irq(&pci_lock); \
if (unlikely(dev->block_ucfg_access)) pci_wait_ucfg(dev); \
ret = dev->bus->ops->read(dev->bus, dev->devfn, \
pos, sizeof(type), &data); \
spin_unlock_irq(&pci_lock); \
raw_spin_unlock_irq(&pci_lock); \
*val = (type)data; \
return ret; \
}
@ -165,11 +165,11 @@ int pci_user_write_config_##size \
{ \
int ret = -EIO; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
spin_lock_irq(&pci_lock); \
raw_spin_lock_irq(&pci_lock); \
if (unlikely(dev->block_ucfg_access)) pci_wait_ucfg(dev); \
ret = dev->bus->ops->write(dev->bus, dev->devfn, \
pos, sizeof(type), val); \
spin_unlock_irq(&pci_lock); \
raw_spin_unlock_irq(&pci_lock); \
return ret; \
}
@ -396,10 +396,10 @@ void pci_block_user_cfg_access(struct pci_dev *dev)
unsigned long flags;
int was_blocked;
spin_lock_irqsave(&pci_lock, flags);
raw_spin_lock_irqsave(&pci_lock, flags);
was_blocked = dev->block_ucfg_access;
dev->block_ucfg_access = 1;
spin_unlock_irqrestore(&pci_lock, flags);
raw_spin_unlock_irqrestore(&pci_lock, flags);
/* If we BUG() inside the pci_lock, we're guaranteed to hose
* the machine */
@ -417,7 +417,7 @@ void pci_unblock_user_cfg_access(struct pci_dev *dev)
{
unsigned long flags;
spin_lock_irqsave(&pci_lock, flags);
raw_spin_lock_irqsave(&pci_lock, flags);
/* This indicates a problem in the caller, but we don't need
* to kill them, unlike a double-block above. */
@ -425,6 +425,6 @@ void pci_unblock_user_cfg_access(struct pci_dev *dev)
dev->block_ucfg_access = 0;
wake_up_all(&pci_ucfg_wait);
spin_unlock_irqrestore(&pci_lock, flags);
raw_spin_unlock_irqrestore(&pci_lock, flags);
}
EXPORT_SYMBOL_GPL(pci_unblock_user_cfg_access);