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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Alexander Usyskin <alexander.usyskin@intel.com>,
        Tomas Winkler <tomas.winkler@intel.com>
Subject: [PATCH 5.14 039/151] mei: hbm: drop hbm responses on early shutdown
Date:   Mon, 18 Oct 2021 15:23:38 +0200
Message-Id: <20211018132341.963860480@linuxfoundation.org>
In-Reply-To: <20211018132340.682786018@linuxfoundation.org>
References: <20211018132340.682786018@linuxfoundation.org>
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From: Alexander Usyskin <alexander.usyskin@intel.com>

commit 6d7163f2c49fda5658e43105a96b555c89a4548d upstream.

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 init or link reset.

Fixes: da3eb47c90d4 ("mei: hbm: drop hbm responses on shutdown")
Fixes: 36edb1407c3c ("mei: allow clients on bus to communicate in remove callback")
Cc: <stable@vger.kernel.org> # v5.12+
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20211013074552.2278419-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/misc/mei/hbm.c |   12 ++++++++----
 1 file changed, 8 insertions(+), 4 deletions(-)

--- a/drivers/misc/mei/hbm.c
+++ b/drivers/misc/mei/hbm.c
@@ -1298,7 +1298,8 @@ int mei_hbm_dispatch(struct mei_device *
 
 		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 		    dev->hbm_state != MEI_HBM_STARTING) {
-			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: start: on shutdown, ignoring\n");
 				return 0;
 			}
@@ -1381,7 +1382,8 @@ int mei_hbm_dispatch(struct mei_device *
 
 		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 		    dev->hbm_state != MEI_HBM_DR_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: dma setup response: on shutdown, ignoring\n");
 				return 0;
 			}
@@ -1448,7 +1450,8 @@ int mei_hbm_dispatch(struct mei_device *
 
 		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 		    dev->hbm_state != MEI_HBM_CLIENT_PROPERTIES) {
-			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: properties response: on shutdown, ignoring\n");
 				return 0;
 			}
@@ -1490,7 +1493,8 @@ int mei_hbm_dispatch(struct mei_device *
 
 		if (dev->dev_state != MEI_DEV_INIT_CLIENTS ||
 		    dev->hbm_state != MEI_HBM_ENUM_CLIENTS) {
-			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: enumeration response: on shutdown, ignoring\n");
 				return 0;
 			}