GPIO fixes for the v5.1 kernel cycle:
- Fix a bug on the errorpath of gpiochip_add_data_with_key()
- IRQ type setting on the spreadtrum GPIO driver
-----BEGIN PGP SIGNATURE-----
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=8FVK
-----END PGP SIGNATURE-----
gpio: Fix gpiochip_add_data_with_key() error path

The err_remove_chip block is too coarse, and may perform cleanup that
must not be done.  E.g. if of_gpiochip_add() fails, of_gpiochip_remove()
is still called, causing:

    OF: ERROR: Bad of_node_put() on /soc/gpio@e6050000
    CPU: 1 PID: 20 Comm: kworker/1:1 Not tainted 5.1.0-rc2-koelsch+ #407
    Hardware name: Generic R-Car Gen2 (Flattened Device Tree)
    Workqueue: events deferred_probe_work_func
    [<c020ec74>] (unwind_backtrace) from [<c020ae58>] (show_stack+0x10/0x14)
    [<c020ae58>] (show_stack) from [<c07c1224>] (dump_stack+0x7c/0x9c)
    [<c07c1224>] (dump_stack) from [<c07c5a80>] (kobject_put+0x94/0xbc)
    [<c07c5a80>] (kobject_put) from [<c0470420>] (gpiochip_add_data_with_key+0x8d8/0xa3c)
    [<c0470420>] (gpiochip_add_data_with_key) from [<c0473738>] (gpio_rcar_probe+0x1d4/0x314)
    [<c0473738>] (gpio_rcar_probe) from [<c052fca8>] (platform_drv_probe+0x48/0x94)

and later, if a GPIO consumer tries to use a GPIO from a failed
controller:

    WARNING: CPU: 0 PID: 1 at lib/refcount.c:156 kobject_get+0x38/0x4c
    refcount_t: increment on 0; use-after-free.
    Modules linked in:
    CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.1.0-rc2-koelsch+ #407
    Hardware name: Generic R-Car Gen2 (Flattened Device Tree)
    [<c020ec74>] (unwind_backtrace) from [<c020ae58>] (show_stack+0x10/0x14)
    [<c020ae58>] (show_stack) from [<c07c1224>] (dump_stack+0x7c/0x9c)
    [<c07c1224>] (dump_stack) from [<c0221580>] (__warn+0xd0/0xec)
    [<c0221580>] (__warn) from [<c02215e0>] (warn_slowpath_fmt+0x44/0x6c)
    [<c02215e0>] (warn_slowpath_fmt) from [<c07c58fc>] (kobject_get+0x38/0x4c)
    [<c07c58fc>] (kobject_get) from [<c068b3ec>] (of_node_get+0x14/0x1c)
    [<c068b3ec>] (of_node_get) from [<c0686f24>] (of_find_node_by_phandle+0xc0/0xf0)
    [<c0686f24>] (of_find_node_by_phandle) from [<c0686fbc>] (of_phandle_iterator_next+0x68/0x154)
    [<c0686fbc>] (of_phandle_iterator_next) from [<c0687fe4>] (__of_parse_phandle_with_args+0x40/0xd0)
    [<c0687fe4>] (__of_parse_phandle_with_args) from [<c0688204>] (of_parse_phandle_with_args_map+0x100/0x3ac)
    [<c0688204>] (of_parse_phandle_with_args_map) from [<c0471240>] (of_get_named_gpiod_flags+0x38/0x380)
    [<c0471240>] (of_get_named_gpiod_flags) from [<c046f864>] (gpiod_get_from_of_node+0x24/0xd8)
    [<c046f864>] (gpiod_get_from_of_node) from [<c0470aa4>] (devm_fwnode_get_index_gpiod_from_child+0xa0/0x144)
    [<c0470aa4>] (devm_fwnode_get_index_gpiod_from_child) from [<c05f425c>] (gpio_keys_probe+0x418/0x7bc)
    [<c05f425c>] (gpio_keys_probe) from [<c052fca8>] (platform_drv_probe+0x48/0x94)

Fix this by splitting the cleanup block, and adding a missing call to
gpiochip_irqchip_remove().

Fixes: 28355f81969962cf ("gpio: defer probe if pinctrl cannot be found")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1 file changed