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authorAndrew Donnellan <andrew.donnellan@au1.ibm.com>2016-12-01 11:23:05 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2016-12-01 22:26:27 +1100
commit409bf7f8a02ef88db5a0f2cdcf9489914f4b8508 (patch)
tree30b48672eb767fdfec1860d412e87c38b24ca4c8 /arch/powerpc
parentdd7b2f035ec41a409f7a7cec7aabc0ec0eacf476 (diff)
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 <pradghos@in.ibm.com> Fixes: 78954700631f ("powerpc/eeh: Avoid I/O access during PE reset") Cc: stable@vger.kernel.org # v3.16+ Signed-off-by: Andrew Donnellan <andrew.donnellan@au1.ibm.com> Acked-by: Russell Currey <ruscur@russell.cc> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')