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p2sb: Factor out p2sb_read_from_cache()

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[ Upstream commit 9244524d60ddea55f4df54c51200e8fef2032447 ]

To prepare for the following fix, factor out the code to read the P2SB
resource from the cache to the new function p2sb_read_from_cache().

Signed-off-by: Shin'ichiro Kawasaki <shinichiro.kawasaki@wdc.com>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://lore.kernel.org/r/20241128002836.373745-2-shinichiro.kawasaki@wdc.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Stable-dep-of: 360c400d0f56 ("p2sb: Do not scan and remove the P2SB device when it is unhidden")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Shin'ichiro Kawasaki
2024-11-28 09:28:33 +09:00
committed by Greg Kroah-Hartman
parent 1e41911ab2
commit da3d454cd5
1 changed files with 17 additions and 11 deletions
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28
drivers/platform/x86/p2sb.c
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@@ -171,6 +171,22 @@ static int p2sb_cache_resources(void)
return ret;
}
static int p2sb_read_from_cache(struct pci_bus *bus, unsigned int devfn,
struct resource *mem)
{
struct p2sb_res_cache *cache = &p2sb_resources[PCI_FUNC(devfn)];
if (cache->bus_dev_id != bus->dev.id)
return -ENODEV;
if (!p2sb_valid_resource(&cache->res))
return -ENOENT;
memcpy(mem, &cache->res, sizeof(*mem));
return 0;
}
/**
* p2sb_bar - Get Primary to Sideband (P2SB) bridge device BAR
* @bus: PCI bus to communicate with
@@ -187,8 +203,6 @@ static int p2sb_cache_resources(void)
*/
int p2sb_bar(struct pci_bus *bus, unsigned int devfn, struct resource *mem)
{
struct p2sb_res_cache *cache;
bus = p2sb_get_bus(bus);
if (!bus)
return -ENODEV;
@@ -196,15 +210,7 @@ int p2sb_bar(struct pci_bus *bus, unsigned int devfn, struct resource *mem)
if (!devfn)
p2sb_get_devfn(&devfn);
cache = &p2sb_resources[PCI_FUNC(devfn)];
if (cache->bus_dev_id != bus->dev.id)
return -ENODEV;
if (!p2sb_valid_resource(&cache->res))
return -ENOENT;
memcpy(mem, &cache->res, sizeof(*mem));
return 0;
return p2sb_read_from_cache(bus, devfn, mem);
}
EXPORT_SYMBOL_GPL(p2sb_bar);