diff options
Diffstat (limited to 'drivers/pci/setup-bus.c')
| -rw-r--r-- | drivers/pci/setup-bus.c | 38 |
1 files changed, 27 insertions, 11 deletions
diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 5356630e0e48..44f4866d95d8 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -752,24 +752,32 @@ static void pci_bridge_check_ranges(struct pci_bus *bus) } /* - * Helper function for sizing routines: find first available bus resource - * of a given type. Note: we intentionally skip the bus resources which - * have already been assigned (that is, have non-NULL parent resource). + * Helper function for sizing routines. Assigned resources have non-NULL + * parent resource. + * + * Return first unassigned resource of the correct type. If there is none, + * return first assigned resource of the correct type. If none of the + * above, return NULL. + * + * Returning an assigned resource of the correct type allows the caller to + * distinguish between already assigned and no resource of the correct type. */ -static struct resource *find_free_bus_resource(struct pci_bus *bus, - unsigned long type_mask, - unsigned long type) +static struct resource *find_bus_resource_of_type(struct pci_bus *bus, + unsigned long type_mask, + unsigned long type) { + struct resource *r, *r_assigned = NULL; int i; - struct resource *r; pci_bus_for_each_resource(bus, r, i) { if (r == &ioport_resource || r == &iomem_resource) continue; if (r && (r->flags & type_mask) == type && !r->parent) return r; + if (r && (r->flags & type_mask) == type && !r_assigned) + r_assigned = r; } - return NULL; + return r_assigned; } static resource_size_t calculate_iosize(resource_size_t size, @@ -866,8 +874,8 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, struct list_head *realloc_head) { struct pci_dev *dev; - struct resource *b_res = find_free_bus_resource(bus, IORESOURCE_IO, - IORESOURCE_IO); + struct resource *b_res = find_bus_resource_of_type(bus, IORESOURCE_IO, + IORESOURCE_IO); resource_size_t size = 0, size0 = 0, size1 = 0; resource_size_t children_add_size = 0; resource_size_t min_align, align; @@ -875,6 +883,10 @@ static void pbus_size_io(struct pci_bus *bus, resource_size_t min_size, if (!b_res) return; + /* If resource is already assigned, nothing more to do */ + if (b_res->parent) + return; + min_align = window_alignment(bus, IORESOURCE_IO); list_for_each_entry(dev, &bus->devices, bus_list) { int i; @@ -978,7 +990,7 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, resource_size_t min_align, align, size, size0, size1; resource_size_t aligns[18]; /* Alignments from 1MB to 128GB */ int order, max_order; - struct resource *b_res = find_free_bus_resource(bus, + struct resource *b_res = find_bus_resource_of_type(bus, mask | IORESOURCE_PREFETCH, type); resource_size_t children_add_size = 0; resource_size_t children_add_align = 0; @@ -987,6 +999,10 @@ static int pbus_size_mem(struct pci_bus *bus, unsigned long mask, if (!b_res) return -ENOSPC; + /* If resource is already assigned, nothing more to do */ + if (b_res->parent) + return 0; + memset(aligns, 0, sizeof(aligns)); max_order = 0; size = 0; |