powerpc/eeh: Fix deadlock when PE frozen state can't be cleared

In eeh_reset_device(), we take the pci_rescan_remove_lock immediately after
after we call eeh_reset_pe() to reset the PCI controller. We then call
eeh_clear_pe_frozen_state(), which can return an error. In this case, we
bail out of eeh_reset_device() without calling pci_unlock_rescan_remove().

Add a call to pci_unlock_rescan_remove() in the eeh_clear_pe_frozen_state()
error path so that we don't cause a deadlock later on.

Reported-by: Pradipta Ghosh <[email protected]>
Fixes: 78954700631f ("powerpc/eeh: Avoid I/O access during PE reset")
Cc: [email protected] # v3.16+
Signed-off-by: Andrew Donnellan <[email protected]>
Acked-by: Russell Currey <[email protected]>
Signed-off-by: Michael Ellerman <[email protected]>

0 files changed, 0 insertions, 0 deletions