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aerdrv: Move cper_print_aer() call out of interrupt context

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The following warning was seen on 3.9 when a corrected PCIe error was being
handled by the AER subsystem.

WARNING: at .../drivers/pci/search.c:214 pci_get_dev_by_id+0x8a/0x90()

This occurred because a call to pci_get_domain_bus_and_slot() was added to
cper_print_pcie() to setup for the call to cper_print_aer().  The warning
showed up because cper_print_pcie() is called in an interrupt context and
pci_get* functions are not supposed to be called in that context.

The solution is to move the cper_print_aer() call out of the interrupt
context and into aer_recover_work_func() to avoid any warnings when calling
pci_get* functions.

Signed-off-by: Lance Ortiz <lance.ortiz@hp.com>
Acked-by: Borislav Petkov <bp@suse.de>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Lance Ortiz 2013-05-30 08:25:12 -06:00 committed by Tony Luck
parent e4aa937ec7
commit 37448adfc7
5 changed files with 12 additions and 24 deletions
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18
drivers/acpi/apei/cper.c
View file

@ -250,10 +250,6 @@ static const char *cper_pcie_port_type_strs[] = {
static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
const struct acpi_hest_generic_data *gdata)
{
#ifdef CONFIG_ACPI_APEI_PCIEAER
struct pci_dev *dev;
#endif
if (pcie->validation_bits & CPER_PCIE_VALID_PORT_TYPE)
printk("%s""port_type: %d, %s\n", pfx, pcie->port_type,
pcie->port_type < ARRAY_SIZE(cper_pcie_port_type_strs) ?
@ -285,20 +281,6 @@ static void cper_print_pcie(const char *pfx, const struct cper_sec_pcie *pcie,
printk(
"%s""bridge: secondary_status: 0x%04x, control: 0x%04x\n",
pfx, pcie->bridge.secondary_status, pcie->bridge.control);
#ifdef CONFIG_ACPI_APEI_PCIEAER
dev = pci_get_domain_bus_and_slot(pcie->device_id.segment,
pcie->device_id.bus, pcie->device_id.function);
if (!dev) {
pr_err("PCI AER Cannot get PCI device %04x:%02x:%02x.%d\n",
pcie->device_id.segment, pcie->device_id.bus,
pcie->device_id.slot, pcie->device_id.function);
return;
}
if (pcie->validation_bits & CPER_PCIE_VALID_AER_INFO)
cper_print_aer(pfx, dev, gdata->error_severity,
(struct aer_capability_regs *) pcie->aer_info);
pci_dev_put(dev);
#endif
}
static const char *apei_estatus_section_flag_strs[] = {

4
drivers/acpi/apei/ghes.c
View file

@ -454,7 +454,9 @@ static void ghes_do_proc(struct ghes *ghes,
aer_severity = cper_severity_to_aer(sev);
aer_recover_queue(pcie_err->device_id.segment,
pcie_err->device_id.bus,
devfn, aer_severity);
devfn, aer_severity,
(struct aer_capability_regs *)
pcie_err->aer_info);
}
}

5
drivers/pci/pcie/aer/aerdrv_core.c
View file

@ -580,6 +580,7 @@ struct aer_recover_entry
u8 devfn;
u16 domain;
int severity;
struct aer_capability_regs *regs;
};
static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
@ -593,7 +594,7 @@ static DEFINE_SPINLOCK(aer_recover_ring_lock);
static DECLARE_WORK(aer_recover_work, aer_recover_work_func);
void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
int severity)
int severity, struct aer_capability_regs *aer_regs)
{
unsigned long flags;
struct aer_recover_entry entry = {
@ -601,6 +602,7 @@ void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
.devfn = devfn,
.domain = domain,
.severity = severity,
.regs = aer_regs,
};
spin_lock_irqsave(&aer_recover_ring_lock, flags);
@ -627,6 +629,7 @@ static void aer_recover_work_func(struct work_struct *work)
PCI_SLOT(entry.devfn), PCI_FUNC(entry.devfn));
continue;
}
cper_print_aer(pdev, entry.severity, entry.regs);
do_recovery(pdev, entry.severity);
pci_dev_put(pdev);
}

4
drivers/pci/pcie/aer/aerdrv_errprint.c
View file

@ -220,7 +220,7 @@ int cper_severity_to_aer(int cper_severity)
}
EXPORT_SYMBOL_GPL(cper_severity_to_aer);
void cper_print_aer(const char *prefix, struct pci_dev *dev, int cper_severity,
void cper_print_aer(struct pci_dev *dev, int cper_severity,
struct aer_capability_regs *aer)
{
int aer_severity, layer, agent, status_strs_size, tlp_header_valid = 0;
@ -244,7 +244,7 @@ void cper_print_aer(const char *prefix, struct pci_dev *dev, int cper_severity,
agent = AER_GET_AGENT(aer_severity, status);
dev_err(&dev->dev, "aer_status: 0x%08x, aer_mask: 0x%08x\n",
status, mask);
cper_print_bits(prefix, status, status_strs, status_strs_size);
cper_print_bits("", status, status_strs, status_strs_size);
dev_err(&dev->dev, "aer_layer=%s, aer_agent=%s\n",
aer_error_layer[layer], aer_agent_string[agent]);
if (aer_severity != AER_CORRECTABLE)

5
include/linux/aer.h
View file

@ -49,10 +49,11 @@ static inline int pci_cleanup_aer_uncorrect_error_status(struct pci_dev *dev)
}
#endif
extern void cper_print_aer(const char *prefix, struct pci_dev *dev,
extern void cper_print_aer(struct pci_dev *dev,
int cper_severity, struct aer_capability_regs *aer);
extern int cper_severity_to_aer(int cper_severity);
extern void aer_recover_queue(int domain, unsigned int bus, unsigned int devfn,
int severity);
int severity,
struct aer_capability_regs *aer_regs);
#endif //_AER_H_