[PATCH] aerdrv: Move cper_print_pcie() out of interrupt context

[Lance Ortiz]

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@xxxxxx>
---

 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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