Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6

* 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6: (30 commits)
  PCI: update for owner removal from struct device_attribute
  PCI: Fix warnings when CONFIG_DMI unset
  PCI: Do not run NVidia quirks related to MSI with MSI disabled
  x86/PCI: use for_each_pci_dev()
  PCI: use for_each_pci_dev()
  PCI: MSI: Restore read_msi_msg_desc(); add get_cached_msi_msg_desc()
  PCI: export SMBIOS provided firmware instance and label to sysfs
  PCI: Allow read/write access to sysfs I/O port resources
  x86/PCI: use host bridge _CRS info on ASRock ALiveSATA2-GLAN
  PCI: remove unused HAVE_ARCH_PCI_SET_DMA_MAX_SEGMENT_{SIZE|BOUNDARY}
  PCI: disable mmio during bar sizing
  PCI: MSI: Remove unsafe and unnecessary hardware access
  PCI: Default PCIe ASPM control to on and require !EMBEDDED to disable
  PCI: kernel oops on access to pci proc file while hot-removal
  PCI: pci-sysfs: remove casts from void*
  ACPI: Disable ASPM if the platform won't provide _OSC control for PCIe
  PCI hotplug: make sure child bridges are enabled at hotplug time
  PCI hotplug: shpchp: Removed check for hotplug of display devices
  PCI hotplug: pciehp: Fixed return value sign for pciehp_unconfigure_device
  PCI: Don't enable aspm before drivers have had a chance to veto it
  ...

3 files changed, 37 insertions, 16 deletions

diff --git a/drivers/pci/pcie/Kconfig b/drivers/pci/pcie/Kconfig
index b8b494b3e0d0..dda70981b7a6 100644
--- a/drivers/pci/pcie/Kconfig
+++ b/drivers/pci/pcie/Kconfig
@@ -31,14 +31,22 @@ source "drivers/pci/pcie/aer/Kconfig"
 # PCI Express ASPM
 #
 config PCIEASPM
-	bool "PCI Express ASPM support(Experimental)"
-	depends on PCI && EXPERIMENTAL && PCIEPORTBUS
-	default n
+	bool "PCI Express ASPM control" if EMBEDDED
+	depends on PCI && PCIEPORTBUS
+	default y
 	help
-	  This enables PCI Express ASPM (Active State Power Management) and
-	  Clock Power Management. ASPM supports state L0/L0s/L1.
+	  This enables OS control over PCI Express ASPM (Active State
+	  Power Management) and Clock Power Management. ASPM supports
+	  state L0/L0s/L1.
 
-	  When in doubt, say N.
+	  ASPM is initially set up the the firmware. With this option enabled,
+	  Linux can modify this state in order to disable ASPM on known-bad
+	  hardware or configurations and enable it when known-safe.
+
+	  ASPM can be disabled or enabled at runtime via
+	  /sys/module/pcie_aspm/parameters/policy
+
+	  When in doubt, say Y.
 config PCIEASPM_DEBUG
 	bool "Debug PCI Express ASPM"
 	depends on PCIEASPM
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 8af4f619bba2..fc0b5a93e1de 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -727,20 +727,21 @@ static void aer_isr_one_error(struct pcie_device *p_device,
 static int get_e_source(struct aer_rpc *rpc, struct aer_err_source *e_src)
 {
 	unsigned long flags;
-	int ret = 0;
 
 	/* Lock access to Root error producer/consumer index */
 	spin_lock_irqsave(&rpc->e_lock, flags);
-	if (rpc->prod_idx != rpc->cons_idx) {
-		*e_src = rpc->e_sources[rpc->cons_idx];
-		rpc->cons_idx++;
-		if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
-			rpc->cons_idx = 0;
-		ret = 1;
+	if (rpc->prod_idx == rpc->cons_idx) {
+		spin_unlock_irqrestore(&rpc->e_lock, flags);
+		return 0;
 	}
+
+	*e_src = rpc->e_sources[rpc->cons_idx];
+	rpc->cons_idx++;
+	if (rpc->cons_idx == AER_ERROR_SOURCES_MAX)
+		rpc->cons_idx = 0;
 	spin_unlock_irqrestore(&rpc->e_lock, flags);
 
-	return ret;
+	return 1;
 }
 
 /**
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index be53d98fa384..71222814c1ec 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -588,11 +588,23 @@ void pcie_aspm_init_link_state(struct pci_dev *pdev)
 	 * update through pcie_aspm_cap_init().
 	 */
 	pcie_aspm_cap_init(link, blacklist);
-	pcie_config_aspm_path(link);
 
 	/* Setup initial Clock PM state */
 	pcie_clkpm_cap_init(link, blacklist);
-	pcie_set_clkpm(link, policy_to_clkpm_state(link));
+
+	/*
+	 * At this stage drivers haven't had an opportunity to change the
+	 * link policy setting. Enabling ASPM on broken hardware can cripple
+	 * it even before the driver has had a chance to disable ASPM, so
+	 * default to a safe level right now. If we're enabling ASPM beyond
+	 * the BIOS's expectation, we'll do so once pci_enable_device() is
+	 * called.
+	 */
+	if (aspm_policy != POLICY_POWERSAVE) {
+		pcie_config_aspm_path(link);
+		pcie_set_clkpm(link, policy_to_clkpm_state(link));
+	}
+
 unlock:
 	mutex_unlock(&aspm_lock);
 out: