linux-kernel - [PATCH 3/4] ASoC: SOF: compress: Prevent current kernel running with older FW

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Message-Id: <20220712141531.14599-4-daniel.baluta@oss.nxp.com>
Date:   Tue, 12 Jul 2022 17:15:30 +0300
From:   Daniel Baluta <daniel.baluta@....nxp.com>
To:     broonie@...nel.org, alsa-devel@...a-project.org
Cc:     daniel.baluta@....com, linux-imx@....com, lgirdwood@...il.com,
        peter.ujfalusi@...ux.intel.com, yung-chuan.liao@...ux.intel.com,
        ranjani.sridharan@...ux.intel.com, kai.vehmanen@...ux.intel.com,
        yc.hung@...iatek.com, linux-kernel@...r.kernel.org,
        Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Subject: [PATCH 3/4] ASoC: SOF: compress: Prevent current kernel running with older FW

From: Daniel Baluta <daniel.baluta@....com>

After introducing extended parameters we need to forbid older firmware
versions to run with the current and future kernel versions.

Although in theory the communication protocol will still work the
semantics at application level are undefined. So, prevent this by
disallowing older firmwares to run with newer kernels.

Signed-off-by: Daniel Baluta <daniel.baluta@....com>
Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
Reviewed-by: Ranjani Sridharan <ranjani.sridharan@...ux.intel.com>
Reviewed-by: Péter Ujfalusi <peter.ujfalusi@...ux.intel.com>
---
 sound/soc/sof/compress.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sound/soc/sof/compress.c b/sound/soc/sof/compress.c
index 1204dce29ef9..67139e15f862 100644
--- a/sound/soc/sof/compress.c
+++ b/sound/soc/sof/compress.c
@@ -167,12 +167,23 @@ static int sof_compr_set_params(struct snd_soc_component *component,
 	struct snd_soc_pcm_runtime *rtd = cstream->private_data;
 	struct snd_compr_runtime *crtd = cstream->runtime;
 	struct sof_ipc_pcm_params_reply ipc_params_reply;
+	struct sof_ipc_fw_ready *ready = &sdev->fw_ready;
+	struct sof_ipc_fw_version *v = &ready->version;
 	struct snd_compr_tstamp *tstamp;
 	struct sof_ipc_pcm_params *pcm;
 	struct snd_sof_pcm *spcm;
 	size_t ext_data_size;
 	int ret;
 
+	if (v->abi_version < SOF_ABI_VER(3, 22, 0)) {
+		dev_err(component->dev,
+			"Compress params not supported with FW ABI version %d:%d:%d\n",
+			SOF_ABI_VERSION_MAJOR(v->abi_version),
+			SOF_ABI_VERSION_MINOR(v->abi_version),
+			SOF_ABI_VERSION_PATCH(v->abi_version));
+		return -EINVAL;
+	}
+
 	tstamp = crtd->private_data;
 
 	spcm = snd_sof_find_spcm_dai(component, rtd);
-- 
2.27.0