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    Subject[PATCH 15/29] bus: mhi: core: Skip device wake in error or shutdown states
    Date
    From: Bhaumik Bhatt <bbhatt@codeaurora.org>

    MHI client drivers can request a device wake even if the device
    may be in an error state or undergoing a shutdown. To prevent
    unnecessary device wake processing, check for the device state
    and bail out early so that the clients are made aware of the
    device state sooner.

    Signed-off-by: Bhaumik Bhatt <bbhatt@codeaurora.org>
    Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
    Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
    ---
    drivers/bus/mhi/core/pm.c | 4 ++++
    1 file changed, 4 insertions(+)

    diff --git a/drivers/bus/mhi/core/pm.c b/drivers/bus/mhi/core/pm.c
    index 805b6fa748f0..029919647002 100644
    --- a/drivers/bus/mhi/core/pm.c
    +++ b/drivers/bus/mhi/core/pm.c
    @@ -827,6 +827,10 @@ int __mhi_device_get_sync(struct mhi_controller *mhi_cntrl)

    /* Wake up the device */
    read_lock_bh(&mhi_cntrl->pm_lock);
    + if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
    + read_unlock_bh(&mhi_cntrl->pm_lock);
    + return -EIO;
    + }
    mhi_cntrl->wake_get(mhi_cntrl, true);
    if (MHI_PM_IN_SUSPEND_STATE(mhi_cntrl->pm_state))
    mhi_trigger_resume(mhi_cntrl);
    --
    2.25.1
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