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rt2x00: Revise irqmask locking for PCI devices

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The PCI device irqmask is locked by a spin_lock. Currently
spin_lock_irqsave is used everywhere. To reduce the locking overhead
replace spin_lock_irqsave in hard irq context with spin_lock and in
soft irq context with spin_lock_irq.

Signed-off-by: Helmut Schaa <helmut.schaa@googlemail.com>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Helmut Schaa 2011-03-03 19:45:16 +01:00 • committed by John W. Linville
parent 567108ebd3
commit 0aa13b2e06
4 changed files with 22 additions and 33 deletions
Download patch file Download diff file Expand all files Collapse all files

15
drivers/net/wireless/rt2x00/rt2400pci.c
View file

@ -1317,27 +1317,25 @@ static void rt2400pci_txdone(struct rt2x00_dev *rt2x00dev,
static void rt2400pci_enable_interrupt(struct rt2x00_dev *rt2x00dev,
struct rt2x00_field32 irq_field)
{
unsigned long flags;
u32 reg;
/*
* Enable a single interrupt. The interrupt mask register
* access needs locking.
*/
spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
spin_lock_irq(&rt2x00dev->irqmask_lock);
rt2x00pci_register_read(rt2x00dev, CSR8, &reg);
rt2x00_set_field32(&reg, irq_field, 0);
rt2x00pci_register_write(rt2x00dev, CSR8, reg);
spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
spin_unlock_irq(&rt2x00dev->irqmask_lock);
}
static void rt2400pci_txstatus_tasklet(unsigned long data)
{
struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
u32 reg;
unsigned long flags;
/*
* Handle all tx queues.
@ -1349,7 +1347,7 @@ static void rt2400pci_txstatus_tasklet(unsigned long data)
/*
* Enable all TXDONE interrupts again.
*/
spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
spin_lock_irq(&rt2x00dev->irqmask_lock);
rt2x00pci_register_read(rt2x00dev, CSR8, &reg);
rt2x00_set_field32(&reg, CSR8_TXDONE_TXRING, 0);
@ -1357,7 +1355,7 @@ static void rt2400pci_txstatus_tasklet(unsigned long data)
rt2x00_set_field32(&reg, CSR8_TXDONE_PRIORING, 0);
rt2x00pci_register_write(rt2x00dev, CSR8, reg);
spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
spin_unlock_irq(&rt2x00dev->irqmask_lock);
}
static void rt2400pci_tbtt_tasklet(unsigned long data)
@ -1378,7 +1376,6 @@ static irqreturn_t rt2400pci_interrupt(int irq, void *dev_instance)
{
struct rt2x00_dev *rt2x00dev = dev_instance;
u32 reg, mask;
unsigned long flags;
/*
* Get the interrupt sources & saved to local variable.
@ -1420,13 +1417,13 @@ static irqreturn_t rt2400pci_interrupt(int irq, void *dev_instance)
* Disable all interrupts for which a tasklet was scheduled right now,
* the tasklet will reenable the appropriate interrupts.
*/
spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
spin_lock(&rt2x00dev->irqmask_lock);
rt2x00pci_register_read(rt2x00dev, CSR8, &reg);
reg |= mask;
rt2x00pci_register_write(rt2x00dev, CSR8, reg);
spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
spin_unlock(&rt2x00dev->irqmask_lock);