Commit f54e714c authored Apr 10, 2018 by Andrey Smirnov Committed by Shawn Guo Apr 23, 2018

soc: imx: gpc: Do not pass static memory as platform data



Platform device core assumes the ownership of dev.platform_data as
well as that it is dynamically allocated and it will try to kfree it
as a part of platform_device_release(). Change the code to use
platform_device_add_data() instead of a pointer to a static memory to
avoid causing a BUG() when calling platform_device_put().

The problem can be reproduced by artificially enabling the error path
of platform_device_add() call (around line 452).

Cc: Stefan Agner <stefan@agner.ch>
Cc: Lucas Stach <l.stach@pengutronix.de>
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

parent 050f810e

drivers/soc/imx/gpc.c

+13 −5

Original line number	Diff line number	Diff line
		@@ -443,17 +443,25 @@ static int imx_gpc_probe(struct platform_device *pdev)
		if (domain_index >= of_id_data->num_domains)
		continue;

		domain = &imx_gpc_domains[domain_index];
		domain->regmap = regmap;
		domain->ipg_rate_mhz = ipg_rate_mhz;

		pd_pdev = platform_device_alloc("imx-pgc-power-domain",
		domain_index);
		if (!pd_pdev) {
		of_node_put(np);
		return -ENOMEM;
		}
		pd_pdev->dev.platform_data = domain;

		ret = platform_device_add_data(pd_pdev,
		&imx_gpc_domains[domain_index],
		sizeof(imx_gpc_domains[domain_index]));
		if (ret) {
		platform_device_put(pd_pdev);
		of_node_put(np);
		return ret;
		}
		domain = pd_pdev->dev.platform_data;
		domain->regmap = regmap;
		domain->ipg_rate_mhz = ipg_rate_mhz;

		pd_pdev->dev.parent = &pdev->dev;
		pd_pdev->dev.of_node = np;