soc: qcom: llcc: Handle a second device without data corruption

[ Upstream commit f1a1bc8775b26345aba2be278118999e7f661d3d ]

Usually there is only one llcc device. But if there were a second, even
a failed probe call would modify the global drv_data pointer. So check
if drv_data is valid before overwriting it.

Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Fixes: a3134fb09e0b ("drivers: soc: Add LLCC driver")
Link: https://lore.kernel.org/r/20230926083229.2073890-1-u.kleine-koenig@pengutronix.de
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/soc/qcom/llcc-qcom.c b/drivers/soc/qcom/llcc-qcom.c
index e32a416..c618485 100644 (file)
--- a/drivers/soc/qcom/llcc-qcom.c
+++ b/drivers/soc/qcom/llcc-qcom.c
@@ -944,6 +944,9 @@ static int qcom_llcc_probe(struct platform_device *pdev)
        u32 version;
        struct regmap *regmap;
 
+       if (!IS_ERR(drv_data))
+               return -EBUSY;
+
        drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
        if (!drv_data) {
                ret = -ENOMEM;