PCI: designware: Remove unnecessary use of 'conf_lock' spinlock

Serialization of configuration accesses is provided by 'pci_lock' in
drivers/pci/access.c thus making the driver's 'conf_lock' superfluous.

Signed-off-by: Andrew Murray <amurray@embedded-bits.co.uk>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Acked-by: Jingoo Han <jg1.han@samsung.com>
Acked-by: Richard Zhu <r65037@freescale.com>

4 files changed, 0 insertions, 9 deletions

diff --git a/drivers/pci/host/pci-exynos.c b/drivers/pci/host/pci-exynos.c
index 3de6bfbbe8e9..32c6d567e12a 100644
--- a/drivers/pci/host/pci-exynos.c
+++ b/drivers/pci/host/pci-exynos.c
@@ -546,7 +546,6 @@ static int add_pcie_port(struct pcie_port *pp, struct platform_device *pdev)
         pp->root_bus_nr = -1;
         pp->ops = &exynos_pcie_host_ops;
 
-        spin_lock_init(&pp->conf_lock);
         ret = dw_pcie_host_init(pp);
         if (ret) {
                 dev_err(&pdev->dev, "failed to initialize host\n");
diff --git a/drivers/pci/host/pci-imx6.c b/drivers/pci/host/pci-imx6.c
index ee082509b0ba..821a01878f59 100644
--- a/drivers/pci/host/pci-imx6.c
+++ b/drivers/pci/host/pci-imx6.c
@@ -501,7 +501,6 @@ static int imx6_add_pcie_port(struct pcie_port *pp,
         pp->root_bus_nr = -1;
         pp->ops = &imx6_pcie_host_ops;
 
-        spin_lock_init(&pp->conf_lock);
         ret = dw_pcie_host_init(pp);
         if (ret) {
                 dev_err(&pdev->dev, "failed to initialize host\n");
diff --git a/drivers/pci/host/pcie-designware.c b/drivers/pci/host/pcie-designware.c
index c4e373294476..495846037ca7 100644
--- a/drivers/pci/host/pcie-designware.c
+++ b/drivers/pci/host/pcie-designware.c
@@ -639,7 +639,6 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
                         int size, u32 *val)
 {
         struct pcie_port *pp = sys_to_pcie(bus->sysdata);
-        unsigned long flags;
         int ret;
 
         if (!pp) {
@@ -652,13 +651,11 @@ static int dw_pcie_rd_conf(struct pci_bus *bus, u32 devfn, int where,
                 return PCIBIOS_DEVICE_NOT_FOUND;
         }
 
-        spin_lock_irqsave(&pp->conf_lock, flags);
         if (bus->number != pp->root_bus_nr)
                 ret = dw_pcie_rd_other_conf(pp, bus, devfn,
                                                 where, size, val);
         else
                 ret = dw_pcie_rd_own_conf(pp, where, size, val);
-        spin_unlock_irqrestore(&pp->conf_lock, flags);
 
         return ret;
 }
@@ -667,7 +664,6 @@ static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
                         int where, int size, u32 val)
 {
         struct pcie_port *pp = sys_to_pcie(bus->sysdata);
-        unsigned long flags;
         int ret;
 
         if (!pp) {
@@ -678,13 +674,11 @@ static int dw_pcie_wr_conf(struct pci_bus *bus, u32 devfn,
         if (dw_pcie_valid_config(pp, bus, PCI_SLOT(devfn)) == 0)
                 return PCIBIOS_DEVICE_NOT_FOUND;
 
-        spin_lock_irqsave(&pp->conf_lock, flags);
         if (bus->number != pp->root_bus_nr)
                 ret = dw_pcie_wr_other_conf(pp, bus, devfn,
                                                 where, size, val);
         else
                 ret = dw_pcie_wr_own_conf(pp, where, size, val);
-        spin_unlock_irqrestore(&pp->conf_lock, flags);
 
         return ret;
 }
diff --git a/drivers/pci/host/pcie-designware.h b/drivers/pci/host/pcie-designware.h
index 3063b3594d88..a10747d58cd7 100644
--- a/drivers/pci/host/pcie-designware.h
+++ b/drivers/pci/host/pcie-designware.h
@@ -41,7 +41,6 @@ struct pcie_port {
         void __iomem            *va_cfg1_base;
         u64                     io_base;
         u64                     mem_base;
-        spinlock_t              conf_lock;
         struct resource         cfg;
         struct resource         io;
         struct resource         mem;