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From:   Herve Codina <herve.codina@bootlin.com>
To:     Herve Codina <herve.codina@bootlin.com>,
        "David S. Miller" <davem@davemloft.net>,
        Eric Dumazet <edumazet@google.com>,
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Cc:     netdev@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-gpio@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        alsa-devel@alsa-project.org, Simon Horman <horms@kernel.org>,
        Christophe JAILLET <christophe.jaillet@wanadoo.fr>,
        Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: [PATCH v9 03/27] soc: fsl: cpm1: qmc: Fix rx channel reset
Date:   Wed, 15 Nov 2023 15:39:39 +0100
Message-ID: <20231115144007.478111-4-herve.codina@bootlin.com>
In-Reply-To: <20231115144007.478111-1-herve.codina@bootlin.com>
References: <20231115144007.478111-1-herve.codina@bootlin.com>
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The qmc_chan_reset_rx() set the is_rx_stopped flag. This leads to an
inconsistent state in the following sequence.
    qmc_chan_stop()
    qmc_chan_reset()
Indeed, after the qmc_chan_reset() call, the channel must still be
stopped. Only a qmc_chan_start() call can move the channel from stopped
state to started state.

Fix the issue removing the is_rx_stopped flag setting from
qmc_chan_reset()

Fixes: 3178d58e0b97 ("soc: fsl: cpm1: Add support for QMC")
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
---
 drivers/soc/fsl/qe/qmc.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/soc/fsl/qe/qmc.c b/drivers/soc/fsl/qe/qmc.c
index 3f3de1351c96..2312152a44b3 100644
--- a/drivers/soc/fsl/qe/qmc.c
+++ b/drivers/soc/fsl/qe/qmc.c
@@ -685,7 +685,6 @@ static void qmc_chan_reset_rx(struct qmc_chan *chan)
 		    qmc_read16(chan->s_param + QMC_SPE_RBASE));
 
 	chan->rx_pending = 0;
-	chan->is_rx_stopped = false;
 
 	spin_unlock_irqrestore(&chan->rx_lock, flags);
 }
-- 
2.41.0