From e5067c718b3a6ecc00351861b3655d8cdeb0b6d2 Mon Sep 17 00:00:00 2001 From: Sergey Ryazanov Date: Sat, 30 Aug 2014 06:06:27 +0400 Subject: MIPS: pci-rt3883: Remove odd locking in PCI config space access code Caller (generic PCI code) already do proper locking so no need to add another one here. Local PCI read/write functions are never called simultaneously, also they do not require synchronization with the PCI controller ops, since they are used before the controller registration. Signed-off-by: Sergey Ryazanov Cc: Linux MIPS Cc: Gabor Juhos Patchwork: https://patchwork.linux-mips.org/patch/7603/ Signed-off-by: Ralf Baechle --- arch/mips/pci/pci-rt3883.c | 9 --------- 1 file changed, 9 deletions(-) (limited to 'arch/mips/pci') diff --git a/arch/mips/pci/pci-rt3883.c b/arch/mips/pci/pci-rt3883.c index 72919aeef42b..0bcc0b1cfddc 100644 --- a/arch/mips/pci/pci-rt3883.c +++ b/arch/mips/pci/pci-rt3883.c @@ -61,7 +61,6 @@ struct rt3883_pci_controller { void __iomem *base; - spinlock_t lock; struct device_node *intc_of_node; struct irq_domain *irq_domain; @@ -111,10 +110,8 @@ static u32 rt3883_pci_read_cfg32(struct rt3883_pci_controller *rpc, address = rt3883_pci_get_cfgaddr(bus, slot, func, reg); - spin_lock_irqsave(&rpc->lock, flags); rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR); ret = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA); - spin_unlock_irqrestore(&rpc->lock, flags); return ret; } @@ -128,10 +125,8 @@ static void rt3883_pci_write_cfg32(struct rt3883_pci_controller *rpc, address = rt3883_pci_get_cfgaddr(bus, slot, func, reg); - spin_lock_irqsave(&rpc->lock, flags); rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR); rt3883_pci_w32(rpc, val, RT3883_PCI_REG_CFGDATA); - spin_unlock_irqrestore(&rpc->lock, flags); } static void rt3883_pci_irq_handler(unsigned int irq, struct irq_desc *desc) @@ -252,10 +247,8 @@ static int rt3883_pci_config_read(struct pci_bus *bus, unsigned int devfn, address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where); - spin_lock_irqsave(&rpc->lock, flags); rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR); data = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA); - spin_unlock_irqrestore(&rpc->lock, flags); switch (size) { case 1: @@ -288,7 +281,6 @@ static int rt3883_pci_config_write(struct pci_bus *bus, unsigned int devfn, address = rt3883_pci_get_cfgaddr(bus->number, PCI_SLOT(devfn), PCI_FUNC(devfn), where); - spin_lock_irqsave(&rpc->lock, flags); rt3883_pci_w32(rpc, address, RT3883_PCI_REG_CFGADDR); data = rt3883_pci_r32(rpc, RT3883_PCI_REG_CFGDATA); @@ -307,7 +299,6 @@ static int rt3883_pci_config_write(struct pci_bus *bus, unsigned int devfn, } rt3883_pci_w32(rpc, data, RT3883_PCI_REG_CFGDATA); - spin_unlock_irqrestore(&rpc->lock, flags); return PCIBIOS_SUCCESSFUL; } -- cgit v1.2.3