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SubjectRe: [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

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