[PATCH 0/3] Minor resource assignment cleanups

[PATCH 0/3] Minor resource assignment cleanups

[Bjorn Helgaas]

These are minor, mostly cosmetic changes, although they do make
a few changes to the messages printed by resource assignment.  I'm
planning these for v3.17.

---

Bjorn Helgaas (3):
      PCI: Cleanup control flow
      PCI: Return conventional error values from pci_revert_fw_address()
      PCI: Tidy resource assignment messages


 drivers/pci/setup-res.c |   69 ++++++++++++++++++++---------------------------
 1 file changed, 30 insertions(+), 39 deletions(-)

[PATCH 1/3] PCI: Cleanup control flow

[Bjorn Helgaas]

Return errors immediately so the straightline path is the normal,
no-error path.  No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/setup-res.c |   35 +++++++++++++++++++----------------
 1 file changed, 19 insertions(+), 16 deletions(-)

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 481c4e18693a..532dc540dc5d 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -305,14 +305,16 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
 	if (ret < 0)
 		ret = pci_revert_fw_address(res, dev, resno, size);
 
-	if (!ret) {
-		res->flags &= ~IORESOURCE_UNSET;
-		res->flags &= ~IORESOURCE_STARTALIGN;
-		dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
-		if (resno < PCI_BRIDGE_RESOURCES)
-			pci_update_resource(dev, resno);
-	}
-	return ret;
+	if (ret)
+		return ret;
+
+	res->flags &= ~IORESOURCE_UNSET;
+	res->flags &= ~IORESOURCE_STARTALIGN;
+	dev_info(&dev->dev, "BAR %d: assigned %pR\n", resno, res);
+	if (resno < PCI_BRIDGE_RESOURCES)
+		pci_update_resource(dev, resno);
+
+	return 0;
 }
 EXPORT_SYMBOL(pci_assign_resource);
 
@@ -335,19 +337,20 @@ int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsiz
 	/* already aligned with min_align */
 	new_size = resource_size(res) + addsize;
 	ret = _pci_assign_resource(dev, resno, new_size, min_align);
-	if (!ret) {
-		res->flags &= ~IORESOURCE_UNSET;
-		res->flags &= ~IORESOURCE_STARTALIGN;
-		dev_info(&dev->dev, "BAR %d: reassigned %pR\n", resno, res);
-		if (resno < PCI_BRIDGE_RESOURCES)
-			pci_update_resource(dev, resno);
-	} else {
+	if (ret) {
 		res->flags = flags;
 		dev_info(&dev->dev, "BAR %d: %pR (failed to expand by %#llx)\n",
 			 resno, res, (unsigned long long) addsize);
+		return ret;
 	}
 
-	return ret;
+	res->flags &= ~IORESOURCE_UNSET;
+	res->flags &= ~IORESOURCE_STARTALIGN;
+	dev_info(&dev->dev, "BAR %d: reassigned %pR\n", resno, res);
+	if (resno < PCI_BRIDGE_RESOURCES)
+		pci_update_resource(dev, resno);
+
+	return 0;
 }
 
 int pci_enable_resources(struct pci_dev *dev, int mask)

[PATCH 2/3] PCI: Return conventional error values from pci_revert_fw_address()

[Bjorn Helgaas]

Previously we returned zero for success or 1 for failure.  This changes
that so we return zero for success or a negative errno for failure.

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/setup-res.c |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 532dc540dc5d..74eb6febdf87 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -166,11 +166,10 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
 {
 	struct resource *root, *conflict;
 	resource_size_t fw_addr, start, end;
-	int ret = 0;
 
 	fw_addr = pcibios_retrieve_fw_addr(dev, resno);
 	if (!fw_addr)
-		return 1;
+		return -ENOMEM;
 
 	start = res->start;
 	end = res->end;
@@ -189,14 +188,13 @@ static int pci_revert_fw_address(struct resource *res, struct pci_dev *dev,
 		 resno, res);
 	conflict = request_resource_conflict(root, res);
 	if (conflict) {
-		dev_info(&dev->dev,
-			 "BAR %d: %pR conflicts with %s %pR\n", resno,
-			 res, conflict->name, conflict);
+		dev_info(&dev->dev, "BAR %d: %pR conflicts with %s %pR\n",
+			 resno, res, conflict->name, conflict);
 		res->start = start;
 		res->end = end;
-		ret = 1;
+		return -EBUSY;
 	}
-	return ret;
+	return 0;
 }
 
 static int __pci_assign_resource(struct pci_bus *bus, struct pci_dev *dev,
@@ -305,7 +303,7 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
 	if (ret < 0)
 		ret = pci_revert_fw_address(res, dev, resno, size);
 
-	if (ret)
+	if (ret < 0)
 		return ret;
 
 	res->flags &= ~IORESOURCE_UNSET;

[PATCH 3/3] PCI: Tidy resource assignment messages

[Bjorn Helgaas]

Print messages about failures in pci_assign_resource().  We can drop the
"by-hand" message from _pci_assign_resource() because %pR now prints the
size rather than the address if the resource hasn't been assigned.

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/setup-res.c |   28 +++++++++-------------------
 1 file changed, 9 insertions(+), 19 deletions(-)

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 74eb6febdf87..6a9e4ec37af0 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -251,7 +251,6 @@ static int _pci_assign_resource(struct pci_dev *dev, int resno,
 	struct resource *res = dev->resource + resno;
 	struct pci_bus *bus;
 	int ret;
-	char *type;
 
 	bus = dev->bus;
 	while ((ret = __pci_assign_resource(bus, dev, resno, size, min_align))) {
@@ -260,21 +259,6 @@ static int _pci_assign_resource(struct pci_dev *dev, int resno,
 		bus = bus->parent;
 	}
 
-	if (ret) {
-		if (res->flags & IORESOURCE_MEM)
-			if (res->flags & IORESOURCE_PREFETCH)
-				type = "mem pref";
-			else
-				type = "mem";
-		else if (res->flags & IORESOURCE_IO)
-			type = "io";
-		else
-			type = "unknown";
-		dev_info(&dev->dev,
-			 "BAR %d: can't assign %s (size %#llx)\n",
-			 resno, type, (unsigned long long) resource_size(res));
-	}
-
 	return ret;
 }
 
@@ -300,11 +284,16 @@ int pci_assign_resource(struct pci_dev *dev, int resno)
 	 * where firmware left it.  That at least has a chance of
 	 * working, which is better than just leaving it disabled.
 	 */
-	if (ret < 0)
+	if (ret < 0) {
+		dev_info(&dev->dev, "BAR %d: no space for %pR\n", resno, res);
 		ret = pci_revert_fw_address(res, dev, resno, size);
+	}
 
-	if (ret < 0)
+	if (ret < 0) {
+		dev_info(&dev->dev, "BAR %d: failed to assign %pR\n", resno,
+			 res);
 		return ret;
+	}
 
 	res->flags &= ~IORESOURCE_UNSET;
 	res->flags &= ~IORESOURCE_STARTALIGN;
@@ -344,7 +333,8 @@ int pci_reassign_resource(struct pci_dev *dev, int resno, resource_size_t addsiz
 
 	res->flags &= ~IORESOURCE_UNSET;
 	res->flags &= ~IORESOURCE_STARTALIGN;
-	dev_info(&dev->dev, "BAR %d: reassigned %pR\n", resno, res);
+	dev_info(&dev->dev, "BAR %d: reassigned %pR (expanded by %#llx)\n",
+		 resno, res, (unsigned long long) addsize);
 	if (resno < PCI_BRIDGE_RESOURCES)
 		pci_update_resource(dev, resno);