netdev - NULL pointer dereference when removing xmm7360 PCI device

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Message-ID: <Yhw4a065te-PH2rfqCYhLt4RZwLJLek2VsfLDrc8TLjfPqxbw6QKbd7L2PwjA81XlBhUr04Nm8-FjfdSsTlkKnIJCcjqHenPx4cbpRLym-U=@samwein.com>
Date:   Thu, 27 Apr 2023 10:31:29 +0000
From:   Samuel Wein PhD <sam@...wein.com>
To:     "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: NULL pointer dereference when removing xmm7360 PCI device

Hi Folks,
I've been trying to get the xmm7360 working with IOSM and the ModemManager. This has been what my highschool advisor would call a "learning process".
When trying `echo 1 > /sys/devices/pci0000:00/0000:00:1c.0/0000:02:00.0/remove` I get a variety of errors. One of these is a kernel error
`2023-04-27T12:23:38.937223+02:00 Nase kernel: [  587.997430] BUG: kernel NULL pointer dereference, address: 0000000000000048
2023-04-27T12:23:38.937237+02:00 Nase kernel: [  587.997447] #PF: supervisor read access in kernel mode
2023-04-27T12:23:38.937238+02:00 Nase kernel: [  587.997455] #PF: error_code(0x0000) - not-present page
2023-04-27T12:23:38.937241+02:00 Nase kernel: [  587.997463] PGD 0 P4D 0 
2023-04-27T12:23:38.937242+02:00 Nase kernel: [  587.997476] Oops: 0000 [#1] PREEMPT SMP NOPTI
2023-04-27T12:23:38.937242+02:00 Nase kernel: [  587.997489] CPU: 1 PID: 4767 Comm: bash Not tainted 6.3.0-060300-generic #202304232030
...
`
the full log is available at https://gist.github.com/poshul/0c5ffbde6106a71adcbc132d828dbcd7

Steps to reproduce: Boot device with xmm7360 installed and in PCI mode, place into suspend. Resume, and start issuing reset/remove commands to the PCI interface (without properly unloading the IOSM module first).

I'm not sure how widely applicable this is but wanted to at least report it.

Sam