Merge branch 'pci/enumeration'

- Use pci_find_vsec_capability() instead of open-coding it (Andy
  Shevchenko)

- Convert pci_dev_present() stub from macro to static inline to avoid
  'unused variable' errors (Hans de Goede)

- Convert sysfs slot attributes from default_attrs to default_groups (Greg
  Kroah-Hartman)

- Use DWORD accesses for LTR, L1 SS to avoid BayHub OZ711LV2 erratum (Rajat
  Jain)

- Remove unnecessary initialization of static variables (Longji Guo)

* pci/enumeration:
  x86/PCI: Remove initialization of static variables to false
  PCI: Use DWORD accesses for LTR, L1 SS to avoid erratum
  PCI/sysfs: Use default_groups in kobj_type for slot attrs
  PCI: Convert pci_dev_present() stub to static inline
  PCI: Use pci_find_vsec_capability() when looking for TBT devices

6 files changed, 21 insertions, 24 deletions

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 948656069cdd..052f1d78a562 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -20,7 +20,7 @@ struct pci_root_info {
 };
 
 static bool pci_use_crs = true;
-static bool pci_ignore_seg = false;
+static bool pci_ignore_seg;
 
 static int __init set_use_crs(const struct dmi_system_id *id)
 {
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 3d2fb394986a..287fa40f763c 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -1556,7 +1556,7 @@ static void pci_save_ltr_state(struct pci_dev *dev)
 {
 	int ltr;
 	struct pci_cap_saved_state *save_state;
-	u16 *cap;
+	u32 *cap;
 
 	if (!pci_is_pcie(dev))
 		return;
@@ -1571,25 +1571,25 @@ static void pci_save_ltr_state(struct pci_dev *dev)
 		return;
 	}
 
-	cap = (u16 *)&save_state->cap.data[0];
-	pci_read_config_word(dev, ltr + PCI_LTR_MAX_SNOOP_LAT, cap++);
-	pci_read_config_word(dev, ltr + PCI_LTR_MAX_NOSNOOP_LAT, cap++);
+	/* Some broken devices only support dword access to LTR */
+	cap = &save_state->cap.data[0];
+	pci_read_config_dword(dev, ltr + PCI_LTR_MAX_SNOOP_LAT, cap);
 }
 
 static void pci_restore_ltr_state(struct pci_dev *dev)
 {
 	struct pci_cap_saved_state *save_state;
 	int ltr;
-	u16 *cap;
+	u32 *cap;
 
 	save_state = pci_find_saved_ext_cap(dev, PCI_EXT_CAP_ID_LTR);
 	ltr = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_LTR);
 	if (!save_state || !ltr)
 		return;
 
-	cap = (u16 *)&save_state->cap.data[0];
-	pci_write_config_word(dev, ltr + PCI_LTR_MAX_SNOOP_LAT, *cap++);
-	pci_write_config_word(dev, ltr + PCI_LTR_MAX_NOSNOOP_LAT, *cap++);
+	/* Some broken devices only support dword access to LTR */
+	cap = &save_state->cap.data[0];
+	pci_write_config_dword(dev, ltr + PCI_LTR_MAX_SNOOP_LAT, *cap);
 }
 
 /**
diff --git a/drivers/pci/pcie/aspm.c b/drivers/pci/pcie/aspm.c
index c6d2e76e0502..a96b7424c9bc 100644
--- a/drivers/pci/pcie/aspm.c
+++ b/drivers/pci/pcie/aspm.c
@@ -503,6 +503,7 @@ static void aspm_calc_l1ss_info(struct pcie_link_state *link,
 	encode_l12_threshold(l1_2_threshold, &scale, &value);
 	ctl1 |= t_common_mode << 8 | scale << 29 | value << 16;
 
+	/* Some broken devices only support dword access to L1 SS */
 	pci_read_config_dword(parent, parent->l1ss + PCI_L1SS_CTL1, &pctl1);
 	pci_read_config_dword(parent, parent->l1ss + PCI_L1SS_CTL2, &pctl2);
 	pci_read_config_dword(child, child->l1ss + PCI_L1SS_CTL1, &cctl1);
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 087d3658f75c..496c8b8d903c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -1579,20 +1579,12 @@ void set_pcie_hotplug_bridge(struct pci_dev *pdev)
 
 static void set_pcie_thunderbolt(struct pci_dev *dev)
 {
-	int vsec = 0;
-	u32 header;
+	u16 vsec;
 
-	while ((vsec = pci_find_next_ext_capability(dev, vsec,
-						    PCI_EXT_CAP_ID_VNDR))) {
-		pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER, &header);
-
-		/* Is the device part of a Thunderbolt controller? */
-		if (dev->vendor == PCI_VENDOR_ID_INTEL &&
-		    PCI_VNDR_HEADER_ID(header) == PCI_VSEC_ID_INTEL_TBT) {
-			dev->is_thunderbolt = 1;
-			return;
-		}
-	}
+	/* Is the device part of a Thunderbolt controller? */
+	vsec = pci_find_vsec_capability(dev, PCI_VENDOR_ID_INTEL, PCI_VSEC_ID_INTEL_TBT);
+	if (vsec)
+		dev->is_thunderbolt = 1;
 }
 
 static void set_pcie_untrusted(struct pci_dev *dev)
diff --git a/drivers/pci/slot.c b/drivers/pci/slot.c
index 751a26668e3a..a0c67191a8b9 100644
--- a/drivers/pci/slot.c
+++ b/drivers/pci/slot.c
@@ -96,11 +96,12 @@ static struct attribute *pci_slot_default_attrs[] = {
 	&pci_slot_attr_cur_speed.attr,
 	NULL,
 };
+ATTRIBUTE_GROUPS(pci_slot_default);
 
 static struct kobj_type pci_slot_ktype = {
 	.sysfs_ops = &pci_slot_sysfs_ops,
 	.release = &pci_slot_release,
-	.default_attrs = pci_slot_default_attrs,
+	.default_groups = pci_slot_default_groups,
 };
 
 static char *make_slot_name(const char *name)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 18a75c8e615c..7d825637d7ca 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1775,7 +1775,10 @@ static inline struct pci_dev *pci_get_class(unsigned int class,
 					    struct pci_dev *from)
 { return NULL; }
 
-#define pci_dev_present(ids)	(0)
+
+static inline int pci_dev_present(const struct pci_device_id *ids)
+{ return 0; }
+
 #define no_pci_devices()	(1)
 #define pci_dev_put(dev)	do { } while (0)