diff mbox

[v10,2/4] PCI: Change pbus_size_mem() return values to be more conventional

Message ID 20140520034558.11972.74795.stgit@bhelgaas-glaptop.roam.corp.google.com
State Accepted
Headers show

Commit Message

Bjorn Helgaas May 20, 2014, 3:45 a.m. UTC 
pbus_size_mem() previously returned 0 for failure and 1 for success.
Change it to return -ENOSPC for failure and 0 for success.

No functional change.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
---
 drivers/pci/setup-bus.c |   35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)


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Comments

Wei Yang May 22, 2014, 8:20 a.m. UTC | #1 
On Mon, May 19, 2014 at 09:45:58PM -0600, Bjorn Helgaas wrote:
>pbus_size_mem() previously returned 0 for failure and 1 for success.
>Change it to return -ENOSPC for failure and 0 for success.
>
>No functional change.
>
>Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>---
> drivers/pci/setup-bus.c |   35 +++++++++++++++++++++--------------
> 1 file changed, 21 insertions(+), 14 deletions(-)
>
>diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
>index 589f2261ab0e..caa07fe6a23a 100644
>--- a/drivers/pci/setup-bus.c
>+++ b/drivers/pci/setup-bus.c
>@@ -915,6 +915,10 @@ static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
>  *
>  * Calculate the size of the bus and minimal alignment which
>  * guarantees that all child resources fit in this size.
>+ *
>+ * Returns -ENOSPC 0 if there's no available bus resource of the desired type.
                    ^^^
One small question, the 0 here means?
Bjorn Helgaas May 22, 2014, 4:59 p.m. UTC | #2 
On Thu, May 22, 2014 at 2:20 AM, Wei Yang <weiyang@linux.vnet.ibm.com> wrote:
> On Mon, May 19, 2014 at 09:45:58PM -0600, Bjorn Helgaas wrote:
>>pbus_size_mem() previously returned 0 for failure and 1 for success.
>>Change it to return -ENOSPC for failure and 0 for success.
>>
>>No functional change.
>>
>>Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
>>---
>> drivers/pci/setup-bus.c |   35 +++++++++++++++++++++--------------
>> 1 file changed, 21 insertions(+), 14 deletions(-)
>>
>>diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
>>index 589f2261ab0e..caa07fe6a23a 100644
>>--- a/drivers/pci/setup-bus.c
>>+++ b/drivers/pci/setup-bus.c
>>@@ -915,6 +915,10 @@ static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
>>  *
>>  * Calculate the size of the bus and minimal alignment which
>>  * guarantees that all child resources fit in this size.
>>+ *
>>+ * Returns -ENOSPC 0 if there's no available bus resource of the desired type.
>                     ^^^
> One small question, the 0 here means?

Just a typo.  Fixed, thanks!
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diff mbox

Patch

diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c
index 589f2261ab0e..caa07fe6a23a 100644
--- a/drivers/pci/setup-bus.c
+++ b/drivers/pci/setup-bus.c
@@ -915,6 +915,10 @@  static inline resource_size_t calculate_mem_align(resource_size_t *aligns,
  *
  * Calculate the size of the bus and minimal alignment which
  * guarantees that all child resources fit in this size.
+ *
+ * Returns -ENOSPC 0 if there's no available bus resource of the desired type.
+ * Otherwise, sets the bus resource start/end to indicate the required
+ * size, adds things to realloc_head (if supplied), and returns 0.
  */
 static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 			 unsigned long type, unsigned long type2,
@@ -931,7 +935,7 @@  static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 	resource_size_t children_add_size = 0;
 
 	if (!b_res)
-		return 0;
+		return -ENOSPC;
 
 	memset(aligns, 0, sizeof(aligns));
 	max_order = 0;
@@ -998,7 +1002,7 @@  static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 				 "%pR to %pR (unused)\n", b_res,
 				 &bus->busn_res);
 		b_res->flags = 0;
-		return 1;
+		return 0;
 	}
 	b_res->start = min_align;
 	b_res->end = size0 + min_align - 1;
@@ -1009,7 +1013,7 @@  static int pbus_size_mem(struct pci_bus *bus, unsigned long mask,
 				 "%pR to %pR add_size %llx\n", b_res,
 				 &bus->busn_res, (unsigned long long)size1-size0);
 	}
-	return 1;
+	return 0;
 }
 
 unsigned long pci_cardbus_resource_alignment(struct resource *res)
@@ -1121,6 +1125,7 @@  void __ref __pci_bus_size_bridges(struct pci_bus *bus,
 	unsigned long mask, prefmask, type2 = 0, type3 = 0;
 	resource_size_t additional_mem_size = 0, additional_io_size = 0;
 	struct resource *b_res;
+	int ret;
 
 	list_for_each_entry(dev, &bus->devices, bus_list) {
 		struct pci_bus *b = dev->subordinate;
@@ -1170,25 +1175,27 @@  void __ref __pci_bus_size_bridges(struct pci_bus *bus,
 		prefmask = IORESOURCE_MEM | IORESOURCE_PREFETCH;
 		if (b_res[2].flags & IORESOURCE_MEM_64) {
 			prefmask |= IORESOURCE_MEM_64;
-			if (pbus_size_mem(bus, prefmask, prefmask,
+			ret = pbus_size_mem(bus, prefmask, prefmask,
 				  prefmask, prefmask,
 				  realloc_head ? 0 : additional_mem_size,
-				  additional_mem_size, realloc_head)) {
-					/*
-					 * Success, with pref mmio64,
-					 * next will size non-pref or
-					 * non-mmio64 */
-					mask = prefmask;
-					type2 = prefmask & ~IORESOURCE_MEM_64;
-					type3 = prefmask & ~IORESOURCE_PREFETCH;
+				  additional_mem_size, realloc_head);
+			if (ret == 0) {
+				/*
+				 * Success, with pref mmio64,
+				 * next will size non-pref or
+				 * non-mmio64 */
+				mask = prefmask;
+				type2 = prefmask & ~IORESOURCE_MEM_64;
+				type3 = prefmask & ~IORESOURCE_PREFETCH;
 			}
 		}
 		if (!type2) {
 			prefmask &= ~IORESOURCE_MEM_64;
-			if (pbus_size_mem(bus, prefmask, prefmask,
+			ret = pbus_size_mem(bus, prefmask, prefmask,
 					 prefmask, prefmask,
 					 realloc_head ? 0 : additional_mem_size,
-					 additional_mem_size, realloc_head)) {
+					 additional_mem_size, realloc_head);
+			if (ret == 0) {
 				/* Success, next will size non-prefetch. */
 				mask = prefmask;
 			} else