[15/29] bus: mhi: core: Skip device wake in error or shutdown states
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Message ID 20201202094159.107075-16-manivannan.sadhasivam@linaro.org
State New, archived
Headers show
  • MHI changes for v5.11
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Commit Message

Manivannan Sadhasivam Dec. 2, 2020, 9:41 a.m. UTC
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(+)

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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 */
+	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))