[PATCH v1 03/10] bus: mhi: core: Skip device wake in error or shutdown states

[Bhaumik Bhatt]

MHI clients can request a device wake even if the device may be in an
error state or undergoing 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@xxxxxxxxxxxxxx>
---
 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 9d4789d..1862960 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);
-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project