Patch "soc: imx: gpcv2: Do not pass static memory as platform data" has been added to the 4.17-stable tree

This is a note to let you know that I've just added the patch titled

soc: imx: gpcv2: Do not pass static memory as platform data

to the 4.17-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
soc-imx-gpcv2-do-not-pass-static-memory-as-platform-data.patch
and it can be found in the queue-4.17 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

From: Andrey Smirnov <[email protected]>
Date: Tue, 10 Apr 2018 11:32:09 -0700
Subject: soc: imx: gpcv2: Do not pass static memory as platform data

From: Andrey Smirnov <[email protected]>

[ Upstream commit 050f810e238f268670f14a8f8b793ba2dbf2e92f ]

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.

---
 drivers/soc/imx/gpcv2.c |   22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

@@ -155,7 +155,7 @@ static int imx7_gpc_pu_pgc_sw_pdn_req(st
 	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 platfo
 			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 platfo
 			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;
 

Patches currently in stable-queue which might be from andrew.smirnov at gmail.com are

queue-4.17/soc-imx-gpcv2-do-not-pass-static-memory-as-platform-data.patch