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() n 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 357). Note that this change also allows us to constify imx7_pgc_domains, since we no longer need to be able to modify it. Cc: Shawn Guo <[email protected]> Cc: Stefan Agner <[email protected]> Cc: Lucas Stach <[email protected]> Cc: [email protected] Cc: [email protected] Signed-off-by: Andrey Smirnov <[email protected]> --- Changes since [v2]: - Patch reworked to use platform_device_add_data() as per request from Shawn Changes since [v1]: - Replaced devm_kzalloc() with devm_kmalloc() as per suggestion from Stefan [v1] lkml.kernel.org/r/[email protected] [v2] lkml.kernel.org/r/[email protected] drivers/soc/imx/gpcv2.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c index afc7ecc3c187..f4e3bd40c72e 100644 --- a/drivers/soc/imx/gpcv2.c +++ b/drivers/soc/imx/gpcv2.c @@ -155,7 +155,7 @@ static int imx7_gpc_pu_pgc_sw_pdn_req(struct generic_pm_domain *genpd) return imx7_gpc_pu_pgc_sw_pxx_req(genpd, false); } -static struct imx7_pgc_domain imx7_pgc_domains[] = { +static const struct imx7_pgc_domain imx7_pgc_domains[] = { [IMX7_POWER_DOMAIN_MIPI_PHY] = { .genpd = { .name = "mipi-phy", @@ -321,11 +321,6 @@ static int imx_gpcv2_probe(struct platform_device *pdev) continue; } - domain = &imx7_pgc_domains[domain_index]; - domain->regmap = regmap; - domain->genpd.power_on = imx7_gpc_pu_pgc_sw_pup_req; - domain->genpd.power_off = imx7_gpc_pu_pgc_sw_pdn_req; - pd_pdev = platform_device_alloc("imx7-pgc-domain", domain_index); if (!pd_pdev) { @@ -334,7 +329,20 @@ static int imx_gpcv2_probe(struct platform_device *pdev) return -ENOMEM; } - pd_pdev->dev.platform_data = domain; + ret = platform_device_add_data(pd_pdev, + &imx7_pgc_domains[domain_index], + sizeof(imx7_pgc_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->genpd.power_on = imx7_gpc_pu_pgc_sw_pup_req; + domain->genpd.power_off = imx7_gpc_pu_pgc_sw_pdn_req; + pd_pdev->dev.parent = dev; pd_pdev->dev.of_node = np; -- 2.14.3
