linux-kernel - Re: [PATCH v3 5/7] gpio: Add GPIO Aggregator/Repeater driver

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Message-ID: <20191203105103.GA20470@x230>
Date:   Tue, 3 Dec 2019 11:51:03 +0100
From:   Eugeniu Rosca <roscaeugeniu@...il.com>
To:     Geert Uytterhoeven <geert+renesas@...der.be>
Cc:     Linus Walleij <linus.walleij@...aro.org>,
        Bartosz Golaszewski <bgolaszewski@...libre.com>,
        Jonathan Corbet <corbet@....net>,
        Rob Herring <robh+dt@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Harish Jenny K N <harish_kandiga@...tor.com>,
        Eugeniu Rosca <erosca@...adit-jv.com>,
        Alexander Graf <graf@...zon.com>,
        Peter Maydell <peter.maydell@...aro.org>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Phil Reid <preid@...ctromag.com.au>,
        Marc Zyngier <marc.zyngier@....com>,
        Christoffer Dall <christoffer.dall@....com>,
        Magnus Damm <magnus.damm@...il.com>,
        linux-gpio@...r.kernel.org, linux-doc@...r.kernel.org,
        devicetree@...r.kernel.org, linux-renesas-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org, qemu-devel@...gnu.org,
        Eugeniu Rosca <roscaeugeniu@...il.com>
Subject: Re: [PATCH v3 5/7] gpio: Add GPIO Aggregator/Repeater driver

Hi Geert,

On Wed, Nov 27, 2019 at 09:42:51AM +0100, Geert Uytterhoeven wrote:
> +static int gpio_aggregator_probe(struct platform_device *pdev)
> +{
> +	struct device *dev = &pdev->dev;
> +	struct gpio_desc **descs;
> +	struct gpiochip_fwd *fwd;
> +	int i, n;

FWIW/FTR, doing some blind creation and deletion of gpio aggregator
chips [1] on R-Car H3ULCB overnight, kmemleak reported once [2]. Not
sure this is something 100% reproducible.

[1] while true; do \
   echo e6055400.gpio 12,13 > /sys/bus/platform/drivers/gpio-aggregator/new_device; \
   echo gpio-aggregator.0 > /sys/bus/platform/drivers/gpio-aggregator/delete_device; \
   done 

[2] unreferenced object 0xffff0006d2c2e000 (size 128):
  comm "kworker/3:1", pid 55, jiffies 4294676978 (age 38546.676s)
  hex dump (first 32 bytes):
    00 d9 d2 d3 06 00 ff ff 0c 00 e0 0f ff ff ff ff  ................
    01 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
  backtrace:
    [<00000000a8e18c13>] slab_post_alloc_hook+0x8c/0x94
    [<000000006f419a4f>] __kmalloc+0x170/0x218
    [<0000000060d185ea>] kobj_map+0x78/0x1c0
    [<00000000c96645f3>] cdev_add+0x68/0x94
    [<00000000a7a5a8ac>] cdev_device_add+0x74/0x90
    [<00000000497871d3>] gpiochip_setup_dev+0x84/0x1f0
    [<00000000b993f95f>] gpiochip_add_data_with_key+0xbcc/0x11f0
    [<00000000fd728c0e>] devm_gpiochip_add_data+0x60/0xa8
    [<00000000442e34c1>] gpio_aggregator_probe+0x210/0x3c8
    [<00000000076e13fb>] platform_drv_probe+0x70/0xe4
    [<00000000de84b58b>] really_probe+0x2d8/0x434
    [<00000000c95c9784>] driver_probe_device+0x15c/0x16c
    [<00000000afb7dd4f>] __device_attach_driver+0xdc/0x120
    [<00000000efa40cae>] bus_for_each_drv+0x12c/0x154
    [<00000000c149acef>] __device_attach+0x148/0x1e0
    [<00000000a74fd158>] device_initial_probe+0x24/0x30

-- 
Best Regards,
Eugeniu