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From:   Tomas Winkler <tomas.winkler@intel.com>
To:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc:     Alexander Usyskin <alexander.usyskin@intel.com>,
        Vitaly Lubart <vitaly.lubart@intel.com>,
        linux-kernel@vger.kernel.org, stable@vger.kernel.org,
        Tomas Winkler <tomas.winkler@intel.com>
Subject: [char-misc-next 2/3] mei: hbm: drop capability response on early shutdown
Date:   Mon,  6 Jun 2022 17:42:24 +0300
Message-Id: <20220606144225.282375-2-tomas.winkler@intel.com>
In-Reply-To: <20220606144225.282375-1-tomas.winkler@intel.com>
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From: Alexander Usyskin <alexander.usyskin@intel.com>

Drop HBM responses also in the early shutdown phase where
the usual traffic is allowed.
Extend the rule that drop HBM responses received during the shutdown
phase by also in MEI_DEV_POWERING_DOWN state.
This resolves the stall if the driver is stopping in the middle
of the link initialization or link reset.

Drop the capabilities response on early shutdown.

Fixes: 6d7163f2c49f ("mei: hbm: drop hbm responses on early shutdown")
Cc: <stable@vger.kernel.org>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
---
 drivers/misc/mei/hbm.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c
index cebcca6d6d3e..cf2b8261da14 100644
--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -1351,7 +1351,8 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr)
 
 		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 		    dev->hbm_state != MEI_HBM_CAP_SETUP) {
-			if (dev->dev_state == MEI_DEV_POWER_DOWN) {
+			if (dev->dev_state == MEI_DEV_POWER_DOWN ||
+			    dev->dev_state == MEI_DEV_POWERING_DOWN) {
 				dev_dbg(dev->dev, "hbm: capabilities response: on shutdown, ignoring\n");
 				return 0;
 			}
-- 
2.35.3