iavf: Detach device during reset task
authorIvan Vecera <ivecera@redhat.com>
Tue, 30 Aug 2022 08:16:27 +0000 (10:16 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Thu, 15 Sep 2022 09:30:05 +0000 (11:30 +0200)
commitc3efe896f13b83b227d8a4637c81e108d1a6795f
tree661223266ec75a80f2dda37e1bc51645e2f794a2
parent2ed94383f3a2693dbf5bc47c514b42524bd8f9ae
iavf: Detach device during reset task

[ Upstream commit aa626da947e9cd30c4cf727493903e1adbb2c0a0 ]

iavf_reset_task() takes crit_lock at the beginning and holds
it during whole call. The function subsequently calls
iavf_init_interrupt_scheme() that grabs RTNL. Problem occurs
when userspace initiates during the reset task any ndo callback
that runs under RTNL like iavf_open() because some of that
functions tries to take crit_lock. This leads to classic A-B B-A
deadlock scenario.

To resolve this situation the device should be detached in
iavf_reset_task() prior taking crit_lock to avoid subsequent
ndos running under RTNL and reattach the device at the end.

Fixes: 62fe2a865e6d ("i40evf: add missing rtnl_lock() around i40evf_set_interrupt_capability")
Cc: Jacob Keller <jacob.e.keller@intel.com>
Cc: Patryk Piotrowski <patryk.piotrowski@intel.com>
Cc: SlawomirX Laba <slawomirx.laba@intel.com>
Tested-by: Vitaly Grinberg <vgrinber@redhat.com>
Signed-off-by: Ivan Vecera <ivecera@redhat.com>
Tested-by: Konrad Jankowski <konrad0.jankowski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
drivers/net/ethernet/intel/iavf/iavf_main.c