This patch protects pci_do_recovery with mutex.

Signed-off-by: Oza Pawandeep <p...@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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