The PCI bus used by cpcihp drivers may be removed at runtime through
/sys/devices/pcissss:bb/ssss\:bb\:dd.f/.../remove interface, so hold
a reference count to the PCI bus to avoid invalid memory access.
Signed-off-by: Jiang Liu <jiang.liu@xxxxxxxxxx>
---
drivers/pci/hotplug/cpcihp_generic.c | 7 +++++--
drivers/pci/hotplug/cpcihp_zt5550.c | 7 +++++--
2 files changed, 10 insertions(+), 4 deletions(-)
diff --git a/drivers/pci/hotplug/cpcihp_generic.c b/drivers/pci/hotplug/cpcihp_generic.c
index 518f387..f002be5 100644
--- a/drivers/pci/hotplug/cpcihp_generic.c
+++ b/drivers/pci/hotplug/cpcihp_generic.c
@@ -163,7 +163,7 @@ static int __init cpcihp_generic_init(void)
err("Invalid bridge device %s", bridge);
bus = NULL;
} else
- bus = dev->subordinate;
+ bus = pci_bus_get(dev->subordinate);
pci_dev_put(dev);
}
if (!bus) {
@@ -179,7 +179,7 @@ static int __init cpcihp_generic_init(void)
if(status != 0) {
err("Could not register cPCI hotplug controller");
status = -ENODEV;
- goto init_find_bus_error;
+ goto init_register_controller_error;
}
dbg("registered controller");
@@ -202,6 +202,8 @@ init_start_error:
cpci_hp_unregister_bus(bus);
init_bus_register_error:
cpci_hp_unregister_controller(&generic_hpc);
+init_register_controller_error:
+ pci_bus_put(bus);
init_find_bus_error:
release_region(port, 1);
err("status = %d", status);
@@ -214,6 +216,7 @@ static void __exit cpcihp_generic_exit(void)
cpci_hp_stop();
cpci_hp_unregister_bus(bus);
cpci_hp_unregister_controller(&generic_hpc);
+ pci_bus_put(bus);
release_region(port, 1);
}
diff --git a/drivers/pci/hotplug/cpcihp_zt5550.c b/drivers/pci/hotplug/cpcihp_zt5550.c
index 8a6f968..6606520 100644
--- a/drivers/pci/hotplug/cpcihp_zt5550.c
+++ b/drivers/pci/hotplug/cpcihp_zt5550.c
@@ -241,9 +241,9 @@ static int zt5550_hc_init_one (struct pci_dev *pdev, const struct pci_device_id
if(!(bus0_dev = pci_get_device(PCI_VENDOR_ID_DEC,
PCI_DEVICE_ID_DEC_21154, NULL))) {
status = -ENODEV;
- goto init_register_error;
+ goto init_find_bus_error;
}
- bus0 = bus0_dev->subordinate;
+ bus0 = pci_bus_get(bus0_dev->subordinate);
pci_dev_put(bus0_dev);
status = cpci_hp_register_bus(bus0, 0x0a, 0x0f);
@@ -265,6 +265,8 @@ static int zt5550_hc_init_one (struct pci_dev *pdev, const struct pci_device_id
init_start_error:
cpci_hp_unregister_bus(bus0);
init_register_error:
+ pci_bus_put(bus0);
+init_find_bus_error:
cpci_hp_unregister_controller(&zt5550_hpc);
init_hc_error:
err("status = %d", status);
@@ -278,6 +280,7 @@ static void __devexit zt5550_hc_remove_one(struct pci_dev *pdev)
cpci_hp_stop();
cpci_hp_unregister_bus(bus0);
cpci_hp_unregister_controller(&zt5550_hpc);
+ pci_bus_put(bus0);
zt5550_hc_cleanup();
}
--
1.7.5.4
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