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

usb: xhci: tegra: fix sleep in atomic call

When we set the dual-role port to Host mode, we observed the following
splat:
[  167.057718] BUG: sleeping function called from invalid context at
include/linux/sched/mm.h:229
[  167.057872] Workqueue: events tegra_xusb_usb_phy_work
[  167.057954] Call trace:
[  167.057962]  dump_backtrace+0x0/0x210
[  167.057996]  show_stack+0x30/0x50
[  167.058020]  dump_stack_lvl+0x64/0x84
[  167.058065]  dump_stack+0x14/0x34
[  167.058100]  __might_resched+0x144/0x180
[  167.058140]  __might_sleep+0x64/0xd0
[  167.058171]  slab_pre_alloc_hook.constprop.0+0xa8/0x110
[  167.058202]  __kmalloc_track_caller+0x74/0x2b0
[  167.058233]  kvasprintf+0xa4/0x190
[  167.058261]  kasprintf+0x58/0x90
[  167.058285]  tegra_xusb_find_port_node.isra.0+0x58/0xd0
[  167.058334]  tegra_xusb_find_port+0x38/0xa0
[  167.058380]  tegra_xusb_padctl_get_usb3_companion+0x38/0xd0
[  167.058430]  tegra_xhci_id_notify+0x8c/0x1e0
[  167.058473]  notifier_call_chain+0x88/0x100
[  167.058506]  atomic_notifier_call_chain+0x44/0x70
[  167.058537]  tegra_xusb_usb_phy_work+0x60/0xd0
[  167.058581]  process_one_work+0x1dc/0x4c0
[  167.058618]  worker_thread+0x54/0x410
[  167.058650]  kthread+0x188/0x1b0
[  167.058672]  ret_from_fork+0x10/0x20

The function tegra_xusb_padctl_get_usb3_companion eventually calls
tegra_xusb_find_port and this in turn calls kasprintf which might sleep
and so cannot be called from an atomic context.

Fix this by moving the call to tegra_xusb_padctl_get_usb3_companion to
the tegra_xhci_id_work function where it is really needed.