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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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