rt2x00: Revise irqmask locking for PCI devices
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>
diff --git a/drivers/net/wireless/rt2x00/rt2400pci.c b/drivers/net/wireless/rt2x00/rt2400pci.c
index 9016c00..80f4988 100644
--- a/drivers/net/wireless/rt2x00/rt2400pci.c
+++ b/drivers/net/wireless/rt2x00/rt2400pci.c
@@ -1317,27 +1317,25 @@
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, ®);
rt2x00_set_field32(®, 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 @@
/*
* Enable all TXDONE interrupts again.
*/
- spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
+ spin_lock_irq(&rt2x00dev->irqmask_lock);
rt2x00pci_register_read(rt2x00dev, CSR8, ®);
rt2x00_set_field32(®, CSR8_TXDONE_TXRING, 0);
@@ -1357,7 +1355,7 @@
rt2x00_set_field32(®, 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 @@
{
struct rt2x00_dev *rt2x00dev = dev_instance;
u32 reg, mask;
- unsigned long flags;
/*
* Get the interrupt sources & saved to local variable.
@@ -1420,13 +1417,13 @@
* 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 |= mask;
rt2x00pci_register_write(rt2x00dev, CSR8, reg);
- spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
+ spin_unlock(&rt2x00dev->irqmask_lock);
diff --git a/drivers/net/wireless/rt2x00/rt2500pci.c b/drivers/net/wireless/rt2x00/rt2500pci.c
index 0fbc18c..635f804 100644
--- a/drivers/net/wireless/rt2x00/rt2500pci.c
+++ b/drivers/net/wireless/rt2x00/rt2500pci.c
@@ -1449,27 +1449,25 @@
static void rt2500pci_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, ®);
rt2x00_set_field32(®, irq_field, 0);
rt2x00pci_register_write(rt2x00dev, CSR8, reg);
- spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
+ spin_unlock_irq(&rt2x00dev->irqmask_lock);
}
static void rt2500pci_txstatus_tasklet(unsigned long data)
{
struct rt2x00_dev *rt2x00dev = (struct rt2x00_dev *)data;
u32 reg;
- unsigned long flags;
/*
* Handle all tx queues.
@@ -1481,7 +1479,7 @@
/*
* Enable all TXDONE interrupts again.
*/
- spin_lock_irqsave(&rt2x00dev->irqmask_lock, flags);
+ spin_lock_irq(&rt2x00dev->irqmask_lock);
rt2x00pci_register_read(rt2x00dev, CSR8, ®);
rt2x00_set_field32(®, CSR8_TXDONE_TXRING, 0);
@@ -1489,7 +1487,7 @@
rt2x00_set_field32(®, 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 rt2500pci_tbtt_tasklet(unsigned long data)
@@ -1510,7 +1508,6 @@
{
struct rt2x00_dev *rt2x00dev = dev_instance;
u32 reg, mask;
- unsigned long flags;
/*
* Get the interrupt sources & saved to local variable.
@@ -1552,13 +1549,13 @@
* 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 |= mask;
rt2x00pci_register_write(rt2x00dev, CSR8, reg);
- spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
+ spin_unlock(&rt2x00dev->irqmask_lock);
return IRQ_HANDLED;
}
diff --git a/drivers/net/wireless/rt2x00/rt2800pci.c b/drivers/net/wireless/rt2x00/rt2800pci.c
index 49ea189..b58484a 100644
--- a/drivers/net/wireless/rt2x00/rt2800pci.c
+++ b/drivers/net/wireless/rt2x00/rt2800pci.c
@@ -765,18 +765,17 @@
static void rt2800pci_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);
rt2800_register_read(rt2x00dev, INT_MASK_CSR, ®);
rt2x00_set_field32(®, irq_field, 1);
rt2800_register_write(rt2x00dev, INT_MASK_CSR, reg);
- spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
+ spin_unlock_irq(&rt2x00dev->irqmask_lock);
}
static void rt2800pci_txstatus_tasklet(unsigned long data)
@@ -862,7 +861,6 @@
{
struct rt2x00_dev *rt2x00dev = dev_instance;
u32 reg, mask;
- unsigned long flags;
/* Read status and ACK all interrupts */
rt2800_register_read(rt2x00dev, INT_SOURCE_CSR, ®);
@@ -905,11 +903,11 @@
* 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);
rt2800_register_read(rt2x00dev, INT_MASK_CSR, ®);
reg &= mask;
rt2800_register_write(rt2x00dev, INT_MASK_CSR, reg);
- spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
+ spin_unlock(&rt2x00dev->irqmask_lock);
return IRQ_HANDLED;
}
diff --git a/drivers/net/wireless/rt2x00/rt61pci.c b/drivers/net/wireless/rt2x00/rt61pci.c
index a014c64f..77e8113 100644
--- a/drivers/net/wireless/rt2x00/rt61pci.c
+++ b/drivers/net/wireless/rt2x00/rt61pci.c
@@ -2263,39 +2263,37 @@
static void rt61pci_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, INT_MASK_CSR, ®);
rt2x00_set_field32(®, irq_field, 0);
rt2x00pci_register_write(rt2x00dev, INT_MASK_CSR, reg);
- spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
+ spin_unlock_irq(&rt2x00dev->irqmask_lock);
}
static void rt61pci_enable_mcu_interrupt(struct rt2x00_dev *rt2x00dev,
struct rt2x00_field32 irq_field)
{
- unsigned long flags;
u32 reg;
/*
* Enable a single MCU 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, MCU_INT_MASK_CSR, ®);
rt2x00_set_field32(®, irq_field, 0);
rt2x00pci_register_write(rt2x00dev, MCU_INT_MASK_CSR, reg);
- spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
+ spin_unlock_irq(&rt2x00dev->irqmask_lock);
}
static void rt61pci_txstatus_tasklet(unsigned long data)
@@ -2333,7 +2331,6 @@
struct rt2x00_dev *rt2x00dev = dev_instance;
u32 reg_mcu, mask_mcu;
u32 reg, mask;
- unsigned long flags;
/*
* Get the interrupt sources & saved to local variable.
@@ -2378,7 +2375,7 @@
* 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, INT_MASK_CSR, ®);
reg |= mask;
@@ -2388,7 +2385,7 @@
reg |= mask_mcu;
rt2x00pci_register_write(rt2x00dev, MCU_INT_MASK_CSR, reg);
- spin_unlock_irqrestore(&rt2x00dev->irqmask_lock, flags);
+ spin_unlock(&rt2x00dev->irqmask_lock);
return IRQ_HANDLED;
}