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Subject[PATCH v11 3/7] PCI/ERR: add mutex to synchronize recovery
Date
This patch protects pci_do_recovery with mutex.

Signed-off-by: Oza Pawandeep <poza@codeaurora.org>

diff --git a/drivers/pci/pcie/pcie-err.c b/drivers/pci/pcie/pcie-err.c
index fcd5add..f830975 100644
--- a/drivers/pci/pcie/pcie-err.c
+++ b/drivers/pci/pcie/pcie-err.c
@@ -20,6 +20,8 @@
#include <linux/pcieport_if.h>
#include "portdrv.h"

+static DEFINE_MUTEX(pci_err_recovery_lock);
+
struct aer_broadcast_data {
enum pci_channel_state state;
enum pci_ers_result result;
@@ -283,6 +285,8 @@ void pcie_do_recovery(struct pci_dev *dev, int severity)
pci_ers_result_t status, result = PCI_ERS_RESULT_RECOVERED;
enum pci_channel_state state;

+ mutex_lock(&pci_err_recovery_lock);
+
if (severity == AER_FATAL)
state = pci_channel_io_frozen;
else
@@ -326,9 +330,11 @@ void pcie_do_recovery(struct pci_dev *dev, int severity)
report_resume);

dev_info(&dev->dev, "Device recovery successful\n");
+ mutex_unlock(&pci_err_recovery_lock);
return;

failed:
/* TODO: Should kernel panic here? */
dev_info(&dev->dev, "Device recovery failed\n");
+ mutex_unlock(&pci_err_recovery_lock);
}
--
Qualcomm Datacenter Technologies, Inc. as an affiliate of Qualcomm Technologies, Inc.,
a Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.
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