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bus: mhi: core: Skip device wake in error or shutdown states 

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>
This commit is contained in:
Bhaumik Bhatt 2020-11-09 12:47:22 -08:00 committed by Manivannan Sadhasivam
parent 8f70397876
commit 8e0559921f
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1 changed files with 4 additions and 0 deletions
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4
drivers/bus/mhi/core/pm.c
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@ -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);