[PATCH V4 1/7] PCI: handle error return from pci_reset_bridge_secondary_bus()

Sinan Kaya
2018-06-28T19:30:59Z

commit 01fd61c0b9bd ("PCI: Add a return type for
pci_reset_bridge_secondary_bus()") added a return value to the function to
return if a device is accessible following a reset. Callers are not
checking the value.

Pass error code up high in the stack if device is not accessible.

Signed-off-by: Sinan Kaya <okaya@codeaurora.org>
---
drivers/pci/hotplug/pciehp_hpc.c | 5 +++--
drivers/pci/pci.c | 12 ++++++------
drivers/pci/pcie/aer.c | 5 +++--
drivers/pci/pcie/err.c | 6 ++++--
4 files changed, 16 insertions(+), 12 deletions(-)

diff --git a/drivers/pci/hotplug/pciehp_hpc.c b/drivers/pci/hotplug/pciehp_hpc.c
index 718b607..bbaa211 100644
--- a/drivers/pci/hotplug/pciehp_hpc.c
+++ b/drivers/pci/hotplug/pciehp_hpc.c
@@ -728,6 +728,7 @@ int pciehp_reset_slot(struct slot *slot, int probe)
struct controller *ctrl = slot->ctrl;
struct pci_dev *pdev = ctrl_dev(ctrl);
u16 stat_mask = 0, ctrl_mask = 0;
+ int rc;

if (probe)
return 0;
@@ -745,7 +746,7 @@ int pciehp_reset_slot(struct slot *slot, int probe)
if (pciehp_poll_mode)
del_timer_sync(&ctrl->poll_timer);

- pci_reset_bridge_secondary_bus(ctrl->pcie->port);
+ rc = pci_reset_bridge_secondary_bus(ctrl->pcie->port);

pcie_capability_write_word(pdev, PCI_EXP_SLTSTA, stat_mask);
pcie_write_cmd_nowait(ctrl, ctrl_mask, ctrl_mask);
@@ -753,7 +754,7 @@ int pciehp_reset_slot(struct slot *slot, int probe)
pci_pcie_cap(ctrl->pcie->port) + PCI_EXP_SLTCTL, ctrl_mask);
if (pciehp_poll_mode)
int_poll_timeout(&ctrl->poll_timer);
- return 0;
+ return rc;
}

int pcie_init_notification(struct controller *ctrl)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 97acba7..98d1490 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4253,9 +4253,7 @@ static int pci_parent_bus_reset(struct pci_dev *dev, int probe)
if (probe)
return 0;

- pci_reset_bridge_secondary_bus(dev->bus->self);
-
- return 0;
+ return pci_reset_bridge_secondary_bus(dev->bus->self);
}

static int pci_reset_hotplug_slot(struct hotplug_slot *hotplug, int probe)
@@ -4850,6 +4848,8 @@ EXPORT_SYMBOL_GPL(pci_try_reset_slot);

static int pci_bus_reset(struct pci_bus *bus, int probe)
{
+ int ret;
+
if (!bus->self || !pci_bus_resetable(bus))
return -ENOTTY;

@@ -4860,11 +4860,11 @@ static int pci_bus_reset(struct pci_bus *bus, int probe)

might_sleep();

- pci_reset_bridge_secondary_bus(bus->self);
+ ret = pci_reset_bridge_secondary_bus(bus->self);

pci_bus_unlock(bus);

- return 0;
+ return ret;
}

/**
@@ -4924,7 +4924,7 @@ int pci_try_reset_bus(struct pci_bus *bus)

if (pci_bus_trylock(bus)) {
might_sleep();
- pci_reset_bridge_secondary_bus(bus->self);
+ rc = pci_reset_bridge_secondary_bus(bus->self);
pci_bus_unlock(bus);
} else
rc = -EAGAIN;
diff --git a/drivers/pci/pcie/aer.c b/drivers/pci/pcie/aer.c
index a2e8838..f1d0f3e 100644
--- a/drivers/pci/pcie/aer.c
+++ b/drivers/pci/pcie/aer.c
@@ -1305,6 +1305,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
{
u32 reg32;
int pos;
+ int rc;

pos = dev->aer_cap;

@@ -1313,7 +1314,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
reg32 &= ~ROOT_PORT_INTR_ON_MESG_MASK;
pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);

- pci_reset_bridge_secondary_bus(dev);
+ rc = pci_reset_bridge_secondary_bus(dev);
pci_printk(KERN_DEBUG, dev, "Root Port link has been reset\n");

/* Clear Root Error Status */
@@ -1325,7 +1326,7 @@ static pci_ers_result_t aer_root_reset(struct pci_dev *dev)
reg32 |= ROOT_PORT_INTR_ON_MESG_MASK;
pci_write_config_dword(dev, pos + PCI_ERR_ROOT_COMMAND, reg32);

- return PCI_ERS_RESULT_RECOVERED;
+ return !rc ? PCI_ERS_RESULT_RECOVERED : PCI_ERS_RESULT_DISCONNECT;
}

/**
diff --git a/drivers/pci/pcie/err.c b/drivers/pci/pcie/err.c
index f7ce0cb..3a62a2e 100644
--- a/drivers/pci/pcie/err.c
+++ b/drivers/pci/pcie/err.c
@@ -175,9 +175,11 @@ static int report_resume(struct pci_dev *dev, void *data)
*/
static pci_ers_result_t default_reset_link(struct pci_dev *dev)
{
- pci_reset_bridge_secondary_bus(dev);
+ int rc;
+
+ rc = pci_reset_bridge_secondary_bus(dev);
pci_printk(KERN_DEBUG, dev, "downstream link has been reset\n");
- return PCI_ERS_RESULT_RECOVERED;
+ return !rc ? PCI_ERS_RESULT_RECOVERED : PCI_ERS_RESULT_DISCONNECT;
}

static pci_ers_result_t reset_link(struct pci_dev *dev, u32 service)
--
2.7.4