gpio: mockup: Convert to use software nodes

The gpio-mockup driver creates the properties that are shared between
platform and GPIO devices. Because of that, the properties may not
be removed at the proper point of time without provoking a use-after-free
as shown in the following backtrace:

  refcount_t: underflow; use-after-free.
  WARNING: CPU: 0 PID: 103 at lib/refcount.c:28 refcount_warn_saturate+0xd1/0x120
  ...
  Call Trace:
  kobject_put+0xdc/0xf0
  software_node_notify_remove+0xa8/0xc0
  device_del+0x15a/0x3e0

That's why the driver has to manage the lifetime of the software nodes
by itself.

The problem originates from the old device_add_properties() API, but
has been only revealed after the commit bd1e336aa853 ("driver core: platform:
Remove platform_device_add_properties()"). Hence, it's used as a landmark
for backporting.

Fixes: bd1e336aa853 ("driver core: platform: Remove platform_device_add_properties()")
Reported-by: Kent Gibson <warthog618@gmail.com>
Tested-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
[Bartosz: tweaked local variable placement]
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>

diff --git a/drivers/gpio/gpio-mockup.c b/drivers/gpio/gpio-mockup.c
index 0a9d746..d26bff2 100644 (file)
--- a/drivers/gpio/gpio-mockup.c
+++ b/drivers/gpio/gpio-mockup.c
@@ -476,10 +476,19 @@ static struct platform_device *gpio_mockup_pdevs[GPIO_MOCKUP_MAX_GC];
 
 static void gpio_mockup_unregister_pdevs(void)
 {
+       struct platform_device *pdev;
+       struct fwnode_handle *fwnode;
        int i;
 
-       for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++)
-               platform_device_unregister(gpio_mockup_pdevs[i]);
+       for (i = 0; i < GPIO_MOCKUP_MAX_GC; i++) {
+               pdev = gpio_mockup_pdevs[i];
+               if (!pdev)
+                       continue;
+
+               fwnode = dev_fwnode(&pdev->dev);
+               platform_device_unregister(pdev);
+               fwnode_remove_software_node(fwnode);
+       }
 }
 
 static __init char **gpio_mockup_make_line_names(const char *label,
@@ -508,6 +517,7 @@ static int __init gpio_mockup_register_chip(int idx)
        struct property_entry properties[GPIO_MOCKUP_MAX_PROP];
        struct platform_device_info pdevinfo;
        struct platform_device *pdev;
+       struct fwnode_handle *fwnode;
        char **line_names = NULL;
        char chip_label[32];
        int prop = 0, base;
@@ -536,13 +546,18 @@ static int __init gpio_mockup_register_chip(int idx)
                                        "gpio-line-names", line_names, ngpio);
        }
 
+       fwnode = fwnode_create_software_node(properties, NULL);
+       if (IS_ERR(fwnode))
+               return PTR_ERR(fwnode);
+
        pdevinfo.name = "gpio-mockup";
        pdevinfo.id = idx;
-       pdevinfo.properties = properties;
+       pdevinfo.fwnode = fwnode;
 
        pdev = platform_device_register_full(&pdevinfo);
        kfree_strarray(line_names, ngpio);
        if (IS_ERR(pdev)) {
+               fwnode_remove_software_node(fwnode);
                pr_err("error registering device");
                return PTR_ERR(pdev);
        }