[PATCH 5.10 001/299] bus: mhi: core: Fix check for syserr at power_up

From: Greg Kroah-Hartman
Date: Mon May 10 2021 - 06:49:42 EST

From: Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx>

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@xxxxxxxxxxxxxx>
Reviewed-by: Loic Poulain <loic.poulain@xxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Link: https://lore.kernel.org/r/1613165243-23359-1-git-send-email-jhugo@xxxxxxxxxxxxxx
Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
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) ||
- if (ret) {
+ if (!ret) {
ret = -EIO;
dev_info(dev, "Failed to reset MHI due to syserr state\n");
goto error_bhi_offset;