hollalinux
/
linux-sg2042
mirror of https://github.com/sophgo/linux-riscv.git
1
0
Fork 0
Code Issues Packages Projects Releases Wiki Activity

soc: imx: gpcv2: 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() 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: 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>
This commit is contained in:
Andrey Smirnov 2018-04-10 11:32:09 -07:00 committed by Shawn Guo
parent 60cc43fc88
commit 050f810e23
1 changed files with 15 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
drivers/soc/imx/gpcv2.c
View File

@ -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;