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authorGabor Juhos <juhosg@openwrt.org>2009-10-07 11:37:00 +0000
committerGabor Juhos <juhosg@openwrt.org>2009-10-07 11:37:00 +0000
commit37f5a64938e39781bc93163b18b413c78172b1ed (patch)
treeeb65edcb935237b6143859f207debf30926ceee4 /target/linux/ramips
parent84e2f22465708e8b0ea1888df540f00b58b61401 (diff)
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ramips: protect rt288x pci config accesses with a spinlock
SVN-Revision: 17971
Diffstat (limited to 'target/linux/ramips')
-rw-r--r--target/linux/ramips/files/arch/mips/pci/pci-rt288x.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/target/linux/ramips/files/arch/mips/pci/pci-rt288x.c b/target/linux/ramips/files/arch/mips/pci/pci-rt288x.c
index fb3a6b13e5..4894882169 100644
--- a/target/linux/ramips/files/arch/mips/pci/pci-rt288x.c
+++ b/target/linux/ramips/files/arch/mips/pci/pci-rt288x.c
@@ -41,6 +41,7 @@
#define PCI_ACCESS_WRITE 1
static void __iomem *rt2880_pci_base;
+static DEFINE_SPINLOCK(rt2880_pci_lock);
static u32 rt2880_pci_reg_read(u32 reg)
{
@@ -72,9 +73,12 @@ static void config_access(unsigned char access_type, struct pci_bus *bus,
static int rt2880_pci_config_read(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 *val)
{
+ unsigned long flags;
u32 data = 0;
+ spin_lock_irqsave(&rt2880_pci_lock, flags);
config_access(PCI_ACCESS_READ, bus, devfn, where, &data);
+ spin_unlock_irqrestore(&rt2880_pci_lock, flags);
if (size == 1)
*val = (data >> ((where & 3) << 3)) & 0xff;
@@ -89,8 +93,10 @@ static int rt2880_pci_config_read(struct pci_bus *bus, unsigned int devfn,
static int rt2880_pci_config_write(struct pci_bus *bus, unsigned int devfn,
int where, int size, u32 val)
{
+ unsigned long flags;
u32 data = 0;
+ spin_lock_irqsave(&rt2880_pci_lock, flags);
if (size == 4) {
data = val;
} else {
@@ -104,6 +110,7 @@ static int rt2880_pci_config_write(struct pci_bus *bus, unsigned int devfn,
}
config_access(PCI_ACCESS_WRITE, bus, devfn, where, &data);
+ spin_unlock_irqrestore(&rt2880_pci_lock, flags);
return PCIBIOS_SUCCESSFUL;
}
@@ -138,11 +145,15 @@ static inline void read_config(unsigned long bus, unsigned long dev,
unsigned long *val)
{
unsigned long address;
+ unsigned long flags;
address = (bus << 16) | (dev << 11) | (func << 8) | (reg & 0xfc) |
0x80000000;
+
+ spin_lock_irqsave(&rt2880_pci_lock, flags);
rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
*val = rt2880_pci_reg_read(RT2880_PCI_REG_CONFIG_DATA);
+ spin_unlock_irqrestore(&rt2880_pci_lock, flags);
}
static inline void write_config(unsigned long bus, unsigned long dev,
@@ -150,11 +161,15 @@ static inline void write_config(unsigned long bus, unsigned long dev,
unsigned long val)
{
unsigned long address;
+ unsigned long flags;
address = (bus << 16) | (dev << 11) | (func << 8) | (reg & 0xfc) |
0x80000000;
+
+ spin_lock_irqsave(&rt2880_pci_lock, flags);
rt2880_pci_reg_write(address, RT2880_PCI_REG_CONFIG_ADDR);
rt2880_pci_reg_write(val, RT2880_PCI_REG_CONFIG_DATA);
+ spin_unlock_irqrestore(&rt2880_pci_lock, flags);
}
int __init pcibios_map_irq(const struct pci_dev *dev, u8 slot, u8 pin)