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Subject[PATCH v2 1/2] soc: imx: gpcv2: Do not pass static memory as platform data
Date
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 pass
kzalloc'ed chunk of memory 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 <shawnguo@kernel.org>
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>
---

Changes since [v1]:

- Replaced devm_kzalloc() with devm_kmalloc() as per suggestion from Stefan

[1] lkml.kernel.org/r/20180110161608.13015-1-andrew.smirnov@gmail.com

drivers/soc/imx/gpcv2.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/soc/imx/gpcv2.c b/drivers/soc/imx/gpcv2.c
index afc7ecc3c187..9947598ec4b5 100644
--- a/drivers/soc/imx/gpcv2.c
+++ b/drivers/soc/imx/gpcv2.c
@@ -18,6 +18,7 @@
#include <linux/pm_domain.h>
#include <linux/regmap.h>
#include <linux/regulator/consumer.h>
+#include <linux/slab.h>
#include <dt-bindings/power/imx7-power.h>

#define GPC_LPCR_A7_BSC 0x000
@@ -155,7 +156,7 @@ 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",
@@ -321,7 +322,14 @@ static int imx_gpcv2_probe(struct platform_device *pdev)
continue;
}

- domain = &imx7_pgc_domains[domain_index];
+ domain = kmalloc(sizeof(*domain), GFP_KERNEL);
+ if (!domain) {
+ of_node_put(np);
+ return -ENOMEM;
+ }
+ memcpy(domain, &imx7_pgc_domains[domain_index],
+ sizeof(*domain));
+
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;
@@ -330,6 +338,7 @@ static int imx_gpcv2_probe(struct platform_device *pdev)
domain_index);
if (!pd_pdev) {
dev_err(dev, "Failed to allocate platform device\n");
+ kfree(domain);
of_node_put(np);
return -ENOMEM;
}
--
2.14.3
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