linux-kernel - [PATCH net-next 2/3] net: ipa: introduce ipa_version

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Message-Id: <20210611203940.3171057-3-elder@linaro.org>
Date:   Fri, 11 Jun 2021 15:39:39 -0500
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     leon@...nel.org, bjorn.andersson@...aro.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, subashab@...eaurora.org, elder@...nel.org,
        aleksander@...ksander.es, ejcaruso@...gle.com,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 2/3] net: ipa: introduce ipa_version_valid()

Define and use a new function that just validates the version
defined in configuration data.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/ipa_main.c | 27 ++++++++++++++++++++++++++-
 1 file changed, 26 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ipa/ipa_main.c b/drivers/net/ipa/ipa_main.c
index 9915603ed10ba..cbd39e4667a32 100644
--- a/drivers/net/ipa/ipa_main.c
+++ b/drivers/net/ipa/ipa_main.c
@@ -639,6 +639,27 @@ static void ipa_validate_build(void)
 #endif /* IPA_VALIDATE */
 }
 
+static bool ipa_version_valid(enum ipa_version version)
+{
+	switch (version) {
+	case IPA_VERSION_3_0:
+	case IPA_VERSION_3_1:
+	case IPA_VERSION_3_5:
+	case IPA_VERSION_3_5_1:
+	case IPA_VERSION_4_0:
+	case IPA_VERSION_4_1:
+	case IPA_VERSION_4_2:
+	case IPA_VERSION_4_5:
+	case IPA_VERSION_4_7:
+	case IPA_VERSION_4_9:
+	case IPA_VERSION_4_11:
+		return true;
+
+	default:
+		return false;
+	}
+}
+
 /**
  * ipa_probe() - IPA platform driver probe function
  * @pdev:	Platform device pointer
@@ -676,11 +697,15 @@ static int ipa_probe(struct platform_device *pdev)
 	/* Get configuration data early; needed for clock initialization */
 	data = of_device_get_match_data(dev);
 	if (!data) {
-		/* This is really IPA_VALIDATE (should never happen) */
 		dev_err(dev, "matched hardware not supported\n");
 		return -ENODEV;
 	}
 
+	if (!ipa_version_valid(data->version)) {
+		dev_err(dev, "invalid IPA version\n");
+		return -EINVAL;
+	}
+
 	/* If we need Trust Zone, make sure it's available */
 	modem_init = of_property_read_bool(dev->of_node, "modem-init");
 	if (!modem_init)
-- 
2.27.0