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

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[ Upstream commit f1a1bc8775 ]

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: a3134fb09e ("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>
This commit is contained in:
Uwe Kleine-König 2023-09-26 10:32:29 +02:00 committed by Greg Kroah-Hartman
parent 19b8098f73
commit 995ee1e84e
1 changed files with 3 additions and 0 deletions
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3
drivers/soc/qcom/llcc-qcom.c
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@ -537,6 +537,9 @@ static int qcom_llcc_probe(struct platform_device *pdev)
u32 sz;
u32 version;
if (!IS_ERR(drv_data))
return -EBUSY;
drv_data = devm_kzalloc(dev, sizeof(*drv_data), GFP_KERNEL);
if (!drv_data) {
ret = -ENOMEM;