CVE-2024-44937: platform/x86: intel-vbtn: Protect ACPI notify handler against recursion

In the Linux kernel, the following vulnerability has been resolved:

platform/x86: intel-vbtn: Protect ACPI notify handler against recursion

Since commit e2ffcda16290 ("ACPI: OSL: Allow Notify () handlers to run on all CPUs") ACPI notify handlers like the intel-vbtn notifyhandler() may run on multiple CPU cores racing with themselves.

This race gets hit on Dell Venue 7140 tablets when undocking from the keyboard, causing the handler to try and register priv->switchesdev twice, as can be seen from the devinfo() message getting logged twice:

[ 83.861800] intel-vbtn INT33D6:00: Registering Intel Virtual Switches input-dev after receiving a switch event [ 83.861858] input: Intel Virtual Switches as /devices/pci0000:00/0000:00:1f.0/PNP0C09:00/INT33D6:00/input/input17 [ 83.861865] intel-vbtn INT33D6:00: Registering Intel Virtual Switches input-dev after receiving a switch event

After which things go seriously wrong: [ 83.861872] sysfs: cannot create duplicate filename '/devices/pci0000:00/0000:00:1f.0/PNP0C09:00/INT33D6:00/input/input17' ... [ 83.861967] kobject: kobjectaddinternal failed for input17 with -EEXIST, don't try to register things with the same name in the same directory. [ 83.877338] BUG: kernel NULL pointer dereference, address: 0000000000000018 ...

Protect intel-vbtn notifyhandler() from racing with itself with a mutex to fix this.