xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

rt2x00: Revise irqmask locking for PCI devices

Browse Source 
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

10
drivers/net/wireless/rt2x00/rt2800pci.c
View File

@@ -765,18 +765,17 @@ static void rt2800pci_txdone(struct rt2x00_dev *rt2x00dev)
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, &reg);
rt2x00_set_field32(&reg, 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 @@ static irqreturn_t rt2800pci_interrupt(int irq, void *dev_instance)
{
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, &reg);
@@ -905,11 +903,11 @@ static irqreturn_t rt2800pci_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);
rt2800_register_read(rt2x00dev, INT_MASK_CSR, &reg);
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;
}