Re: [PATCH v2] usb: gadget: f_uvc: fix superspeedplus transfer

[Greg KH <gregkh@linuxfoundation.org>]

On Tue, Feb 15, 2022 at 10:16:47AM +0800, 3090101217@zju.edu.cn wrote:
> From: Jing Leng <jleng@ambarella.com>
> 
> UVC driver doesn't set ssp_descriptors in struct usb_function,
> If UVC uses superspeedplus UDC (e.g. cdnsp), when
> config_ep_by_speed_and_alt is called, the g->speed is
> USB_SPEED_SUPER_PLUS, and f->ssp_descriptors is NULL,
> So kernel will access NULL pointer of speed_desc.
> 
> Call trace:
>  config_ep_by_speed_and_alt+0x3c/0x2a0 [libcomposite]
>  uvc_function_set_alt+0xd4/0x2e8 [usb_f_uvc]
>  set_config.constprop.0+0x154/0x3a0 [libcomposite]
>  composite_setup+0x314/0xb44 [libcomposite]
>  configfs_composite_setup+0x84/0xb0 [libcomposite]
>  cdnsp_ep0_std_request+0x25c/0x470 [cdns3]
>  cdnsp_setup_analyze+0x94/0x25c [cdns3]
>  cdnsp_handle_event+0xe8/0x23c [cdns3]
>  cdnsp_thread_irq_handler+0x58/0xe8 [cdns3]
>  irq_thread_fn+0x2c/0xa0
>  irq_thread+0x164/0x280
>  kthread+0x128/0x134
>  ret_from_fork+0x10/0x40

What does "call trace" here mean?  Is this an error?  Something else?

> 
> Signed-off-by: Jing Leng <jleng@ambarella.com>
> ---
>  drivers/usb/gadget/function/f_uvc.c | 14 ++++++++++++--
>  1 file changed, 12 insertions(+), 2 deletions(-)

You did not read the information that my bot told you to read, for how
to properly version your patches :(

Please go back and do so when you resend all of them.

Also this is not a patch series?  Why not?

thanks,

greg k-h