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authorAndrew Donnellan <andrew.donnellan@au1.ibm.com>2016-12-01 11:23:05 +1100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2016-12-15 08:49:21 -0800
commit4bcea472de100311614c442f7236d0bcc4a413b3 (patch)
tree642d496d2807419a74f27c54a1e9fef4a6cc602e /arch
parentc95b7f1fab0c76882764a5196119237c8ad436ee (diff)
powerpc/eeh: Fix deadlock when PE frozen state can't be cleared
commit 409bf7f8a02ef88db5a0f2cdcf9489914f4b8508 upstream. 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") 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/kernel/eeh_driver.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c
index c07bfb52275e..300382e5a2cc 100644
--- a/arch/powerpc/kernel/eeh_driver.c
+++ b/arch/powerpc/kernel/eeh_driver.c
@@ -612,8 +612,10 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus)
/* Clear frozen state */
rc = eeh_clear_pe_frozen_state(pe, false);
- if (rc)
+ if (rc) {
+ pci_unlock_rescan_remove();
return rc;
+ }
/* Give the system 5 seconds to finish running the user-space
* hotplug shutdown scripts, e.g. ifdown for ethernet. Yes,