linux-kernel - [PATCH 5.7 023/244] net: ipa: always check for stopped channel

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Message-Id: <20200720152826.970928166@linuxfoundation.org>
Date:   Mon, 20 Jul 2020 17:34:54 +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, Alex Elder <elder@...aro.org>,
        "David S. Miller" <davem@...emloft.net>
Subject: [PATCH 5.7 023/244] net: ipa: always check for stopped channel

From: Alex Elder <elder@...aro.org>

[ Upstream commit 5468cbcddf47f674829c6ada190283108a63d7b5 ]

In gsi_channel_stop(), there's a check to see if the channel might
have entered STOPPED state since a previous call, which might have
timed out before stopping completed.

That check actually belongs in gsi_channel_stop_command(), which is
called repeatedly by gsi_channel_stop() for RX channels.

Fixes: 650d1603825d ("soc: qcom: ipa: the generic software interface")
Signed-off-by: Alex Elder <elder@...aro.org>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/ipa/gsi.c |   13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -490,6 +490,12 @@ static int gsi_channel_stop_command(stru
 	enum gsi_channel_state state = channel->state;
 	int ret;
 
+	/* Channel could have entered STOPPED state since last call
+	 * if it timed out.  If so, we're done.
+	 */
+	if (state == GSI_CHANNEL_STATE_STOPPED)
+		return 0;
+
 	if (state != GSI_CHANNEL_STATE_STARTED &&
 	    state != GSI_CHANNEL_STATE_STOP_IN_PROC)
 		return -EINVAL;
@@ -773,13 +779,6 @@ int gsi_channel_stop(struct gsi *gsi, u3
 
 	gsi_channel_freeze(channel);
 
-	/* Channel could have entered STOPPED state since last call if the
-	 * STOP command timed out.  We won't stop a channel if stopping it
-	 * was successful previously (so we still want the freeze above).
-	 */
-	if (channel->state == GSI_CHANNEL_STATE_STOPPED)
-		return 0;
-
 	/* RX channels might require a little time to enter STOPPED state */
 	retries = channel->toward_ipa ? 0 : GSI_CHANNEL_STOP_RX_RETRIES;