summaryrefslogtreecommitdiffstats
path: root/drivers/pci/hotplug/pciehp_hpc.c
diff options
context:
space:
mode:
authorLukas Wunner <lukas@wunner.de>2018-09-08 09:59:01 +0200
committerBjorn Helgaas <bhelgaas@google.com>2018-09-18 17:52:15 -0500
commit125450f814418b9f889c9885831467d1b2e25a7d (patch)
tree4acbbedcd4446d00cd5f5122b56aa7d2d7646815 /drivers/pci/hotplug/pciehp_hpc.c
parenta7da21613c4efcd4cc0235e6a30bec96ae47c619 (diff)
downloadlinux-125450f814418b9f889c9885831467d1b2e25a7d.tar.bz2
PCI: hotplug: Embed hotplug_slot
When the PCI hotplug core and its first user, cpqphp, were introduced in February 2002 with historic commit a8a2069f432c, cpqphp allocated a slot struct for its internal use plus a hotplug_slot struct to be registered with the hotplug core and linked the two with pointers: https://git.kernel.org/tglx/history/c/a8a2069f432c Nowadays, the predominant pattern in the tree is to embed ("subclass") such structures in one another and cast to the containing struct with container_of(). But it wasn't until July 2002 that container_of() was introduced with historic commit ec4f214232cf: https://git.kernel.org/tglx/history/c/ec4f214232cf pnv_php, introduced in 2016, did the right thing and embedded struct hotplug_slot in its internal struct pnv_php_slot, but all other drivers cargo-culted cpqphp's design and linked separate structs with pointers. Embedding structs is preferrable to linking them with pointers because it requires fewer allocations, thereby reducing overhead and simplifying error paths. Casting an embedded struct to the containing struct becomes a cheap subtraction rather than a dereference. And having fewer pointers reduces the risk of them pointing nowhere either accidentally or due to an attack. Convert all drivers to embed struct hotplug_slot in their internal slot struct. The "private" pointer in struct hotplug_slot thereby becomes unused, so drop it. Signed-off-by: Lukas Wunner <lukas@wunner.de> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> Acked-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> # drivers/pci/hotplug/rpa* Acked-by: Sebastian Ott <sebott@linux.ibm.com> # drivers/pci/hotplug/s390* Acked-by: Andy Shevchenko <andy.shevchenko@gmail.com> # drivers/platform/x86 Cc: Len Brown <lenb@kernel.org> Cc: Scott Murray <scott@spiteful.org> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Oliver OHalloran <oliveroh@au1.ibm.com> Cc: Gavin Shan <gwshan@linux.vnet.ibm.com> Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com> Cc: Corentin Chary <corentin.chary@gmail.com> Cc: Darren Hart <dvhart@infradead.org>
Diffstat (limited to 'drivers/pci/hotplug/pciehp_hpc.c')
-rw-r--r--drivers/pci/hotplug/pciehp_hpc.c8
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 0289a3ae4d90..7b5f9db60d9a 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -315,7 +315,7 @@ static int pciehp_link_enable(struct controller *ctrl)
int pciehp_get_raw_indicator_status(struct hotplug_slot *hotplug_slot,
u8 *status)
{
- struct controller *ctrl = hotplug_slot->private;
+ struct controller *ctrl = to_ctrl(hotplug_slot);
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 slot_ctrl;
@@ -328,7 +328,7 @@ int pciehp_get_raw_indicator_status(struct hotplug_slot *hotplug_slot,
int pciehp_get_attention_status(struct hotplug_slot *hotplug_slot, u8 *status)
{
- struct controller *ctrl = hotplug_slot->private;
+ struct controller *ctrl = to_ctrl(hotplug_slot);
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 slot_ctrl;
@@ -422,7 +422,7 @@ int pciehp_query_power_fault(struct controller *ctrl)
int pciehp_set_raw_indicator_status(struct hotplug_slot *hotplug_slot,
u8 status)
{
- struct controller *ctrl = hotplug_slot->private;
+ struct controller *ctrl = to_ctrl(hotplug_slot);
struct pci_dev *pdev = ctrl_dev(ctrl);
pci_config_pm_runtime_get(pdev);
@@ -758,7 +758,7 @@ void pcie_clear_hotplug_events(struct controller *ctrl)
*/
int pciehp_reset_slot(struct hotplug_slot *hotplug_slot, int probe)
{
- struct controller *ctrl = hotplug_slot->private;
+ struct controller *ctrl = to_ctrl(hotplug_slot);
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 stat_mask = 0, ctrl_mask = 0;
int rc;