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Message-ID: <20130508171519.26724.63307.stgit@grignak.americas.hpqcorp.net>
Date: Wed, 08 May 2013 11:15:19 -0600
From: Lance Ortiz <lance.ortiz@...com>
To: bhelgaas@...gle.com, lance_ortiz@...mail.com, jiang.liu@...wei.com,
tony.luck@...el.com, bp@...en8.de, rostedt@...dmis.org,
mchehab@...hat.com, linux-acpi@...r.kernel.org,
linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH] aerdrv: Move cper_print_pcie() out of interrupt context
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 code was added to the function cper_print_pcie() that
calls the pci_get_domain_bus_and_slot() function. cper_print_pcie() is called
in an interrupt context and pci_get* functions are not supposed to be called
in that context hence the warning.
The solution is to move the call to cper_print_aer() out of the interrupt
context and into aer_recover_queue() to avoid any warnings when calling
pci_get* functions.
Signed-off-by: Lance Ortiz <lance.ortiz@...com>
---
drivers/acpi/apei/cper.c | 18 ------------------
drivers/acpi/apei/ghes.c | 3 ++-
drivers/pci/pcie/aer/aerdrv_core.c | 6 +++++-
include/linux/aer.h | 2 +-
4 files changed, 8 insertions(+), 21 deletions(-)
diff --git a/drivers/acpi/apei/cper.c b/drivers/acpi/apei/cper.c
index 1e5d8a4..8713229 100644
--- a/drivers/acpi/apei/cper.c
+++ b/drivers/acpi/apei/cper.c
@@ -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[] = {
diff --git a/drivers/acpi/apei/ghes.c b/drivers/acpi/apei/ghes.c
index d668a8a..f2084b5 100644
--- a/drivers/acpi/apei/ghes.c
+++ b/drivers/acpi/apei/ghes.c
@@ -454,7 +454,8 @@ 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,
+ pcie_err->aer_info);
}
}
diff --git a/drivers/pci/pcie/aer/aerdrv_core.c b/drivers/pci/pcie/aer/aerdrv_core.c
index 564d97f..26aec0f 100644
--- a/drivers/pci/pcie/aer/aerdrv_core.c
+++ b/drivers/pci/pcie/aer/aerdrv_core.c
@@ -582,6 +582,7 @@ struct aer_recover_entry
u8 devfn;
u16 domain;
int severity;
+ u8 *regs;
};
static DEFINE_KFIFO(aer_recover_ring, struct aer_recover_entry,
@@ -595,7 +596,7 @@ 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, u8 *aer_regs)
{
unsigned long flags;
struct aer_recover_entry entry = {
@@ -603,6 +604,7 @@ 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);
@@ -629,6 +631,8 @@ 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,
+ (struct aer_capability_regs *)entry.regs);
do_recovery(pdev, entry.severity);
pci_dev_put(pdev);
}
diff --git a/include/linux/aer.h b/include/linux/aer.h
index ec10e1b..a5c1583 100644
--- a/include/linux/aer.h
+++ b/include/linux/aer.h
@@ -53,6 +53,6 @@ extern void cper_print_aer(const char *prefix, 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, u8 *aer_regs);
#endif //_AER_H_
--
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