Commit c2078d9e authored by Guilherme G. Piccoli's avatar Guilherme G. Piccoli Committed by Michael Ellerman

Revert "powerpc/eeh: Fix crash in eeh_add_device_early() on Cell"

This reverts commit 89a51df5.

The function eeh_add_device_early() is used to perform EEH
initialization in devices added later on the system, like in
hotplug/DLPAR scenarios. Since the commit 89a51df5 ("powerpc/eeh:
Fix crash in eeh_add_device_early() on Cell") a new check was introduced
in this function - Cell has no EEH capabilities which led to kernel oops
if hotplug was performed, so checking for eeh_enabled() was introduced
to avoid the issue.

However, in architectures that EEH is present like pSeries or PowerNV,
we might reach a case in which no PCI devices are present on boot time
and so EEH is not initialized. Then, if a device is added via DLPAR for
example, eeh_add_device_early() fails because eeh_enabled() is false,
and EEH end up not being enabled at all.

This reverts the aforementioned patch since a new verification was
introduced by the commit d91dafc0 ("powerpc/eeh: Delay probing EEH
device during hotplug") and so the original Cell issue does not happen
anymore.

Cc: stable@vger.kernel.org # v4.1+
Reviewed-by: default avatarGavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: default avatarGuilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent d6d63d72
...@@ -1068,7 +1068,7 @@ void eeh_add_device_early(struct pci_dn *pdn) ...@@ -1068,7 +1068,7 @@ void eeh_add_device_early(struct pci_dn *pdn)
struct pci_controller *phb; struct pci_controller *phb;
struct eeh_dev *edev = pdn_to_eeh_dev(pdn); struct eeh_dev *edev = pdn_to_eeh_dev(pdn);
if (!edev || !eeh_enabled()) if (!edev)
return; return;
if (!eeh_has_flag(EEH_PROBE_MODE_DEVTREE)) if (!eeh_has_flag(EEH_PROBE_MODE_DEVTREE))
......
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