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d7d4592ada
Attaching and detaching devices can be heavy-weight and detaching can
sleep waiting for events. For that reason using the system-wide
single-threaded taskqueue_thread is not really appropriate.
There is even a possibility for a deadlock if taskqueue_thread is used
for detaching.
In fact, there is an easy to reproduce deadlock involving nvme, pass
and a sudden removal of an NVMe device.
A pass peripheral would not release a reference on an nvme sim until
pass_shutdown_kqueue() is executed via taskqueue_thread. But the
taskqueue's thread is blocked in nvme_detach() -> ... -> cam_sim_free()
because of the outstanding reference.
Sponsored by: CyberSecure
Reviewed by: mav, imp
(cherry picked from commit
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| .. | ||
| controller | ||
| fixup_pci.c | ||
| hostb_pci.c | ||
| ignore_pci.c | ||
| isa_pci.c | ||
| pci.c | ||
| pci_dw.c | ||
| pci_dw.h | ||
| pci_dw_if.m | ||
| pci_dw_mv.c | ||
| pci_host_generic.c | ||
| pci_host_generic.h | ||
| pci_host_generic_acpi.c | ||
| pci_host_generic_acpi.h | ||
| pci_host_generic_fdt.c | ||
| pci_host_generic_fdt.h | ||
| pci_if.m | ||
| pci_iov.c | ||
| pci_iov.h | ||
| pci_iov_if.m | ||
| pci_iov_private.h | ||
| pci_iov_schema.c | ||
| pci_pci.c | ||
| pci_private.h | ||
| pci_subr.c | ||
| pci_user.c | ||
| pcib_if.m | ||
| pcib_private.h | ||
| pcib_support.c | ||
| pcireg.h | ||
| pcivar.h | ||
| schema_private.h | ||
| vga_pci.c | ||