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| author | Gabor Juhos <juhosg@openwrt.org> | 2009-10-07 11:37:00 +0000 |
|---|---|---|
| committer | Gabor Juhos <juhosg@openwrt.org> | 2009-10-07 11:37:00 +0000 |
| commit | 37f5a64938e39781bc93163b18b413c78172b1ed (patch) | |
| tree | eb65edcb935237b6143859f207debf30926ceee4 /target/linux/ramips | |
| parent | 84e2f22465708e8b0ea1888df540f00b58b61401 (diff) | |
| download | upstream-37f5a64938e39781bc93163b18b413c78172b1ed.tar.gz upstream-37f5a64938e39781bc93163b18b413c78172b1ed.tar.bz2 upstream-37f5a64938e39781bc93163b18b413c78172b1ed.zip | |
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.c | 15 |
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) |