On Tue, May 30, 2023 at 6:17 PM Biju Das [off-list ref] wrote:

Currently {modprobe, bind} after {rmmod, unbind} results in probe failure.

genirq: Flags mismatch irq 22. 00000004 (85070400.usb3drd) vs. 00000004 (85070400.usb3drd)
renesas_usb3: probe of 85070000.usb3peri failed with error -16

The reason is, it is trying to register an interrupt handler for the same
IRQ twice. The devm_request_irq() was called with the parent device.
So the interrupt handler won't be unregistered when the usb3-peri device
is unbound.

Fix this issue by replacing "parent dev"->"dev" as the irq resource
is managed by this driver.

Fixes: 9cad72dfc556 ("usb: gadget: Add support for RZ/V2M USB3DRD driver")
Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
---
v1->v2:
 * Added missing ')' at the end of the line for fixes tag.
 * Updated commit description.
 * Replaced "ddata->dev"->"&pdev->dev" for the devname parameter.

Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds