linux-kernel - [PATCH 5.10 001/299] bus: mhi: core: Fix check for syserr at power

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Date:   Mon, 10 May 2021 12:16:38 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Jeffrey Hugo <jhugo@...eaurora.org>,
        Loic Poulain <loic.poulain@...aro.org>,
        Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Subject: [PATCH 5.10 001/299] bus: mhi: core: Fix check for syserr at power_up

From: Jeffrey Hugo <jhugo@...eaurora.org>

commit 6403298c58d4858d93648f553abf0bcbd2dfaca2 upstream.

The check to see if we have reset the device after detecting syserr at
power_up is inverted.  wait_for_event_timeout() returns 0 on failure,
and a positive value on success.  The check is looking for non-zero
as a failure, which is likely to incorrectly cause a device init failure
if syserr was detected at power_up.  Fix this.

Fixes: e18d4e9fa79b ("bus: mhi: core: Handle syserr during power_up")
Signed-off-by: Jeffrey Hugo <jhugo@...eaurora.org>
Reviewed-by: Loic Poulain <loic.poulain@...aro.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Link: https://lore.kernel.org/r/1613165243-23359-1-git-send-email-jhugo@codeaurora.org
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/bus/mhi/core/pm.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/bus/mhi/core/pm.c
+++ b/drivers/bus/mhi/core/pm.c
@@ -992,7 +992,7 @@ int mhi_async_power_up(struct mhi_contro
 							   &val) ||
 					!val,
 				msecs_to_jiffies(mhi_cntrl->timeout_ms));
-		if (ret) {
+		if (!ret) {
 			ret = -EIO;
 			dev_info(dev, "Failed to reset MHI due to syserr state\n");
 			goto error_bhi_offset;