From: Guilherme G. Piccoli Date: Mon, 11 Apr 2016 19:17:22 +0000 (-0300) Subject: Revert "powerpc/eeh: Fix crash in eeh_add_device_early() on Cell" X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c2078d9ef600bdbe568c89e5ddc2c6f15b7982c8;p=linux-beck.git Revert "powerpc/eeh: Fix crash in eeh_add_device_early() on Cell" This reverts commit 89a51df5ab1d38b257300b8ac940bbac3bb0eb9b. 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 89a51df5ab1d ("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 d91dafc02f42 ("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: Gavin Shan Signed-off-by: Guilherme G. Piccoli Signed-off-by: Michael Ellerman --- diff --git a/arch/powerpc/kernel/eeh.c b/arch/powerpc/kernel/eeh.c index 9d1d46ccf16c..c9bc78e9c610 100644 --- a/arch/powerpc/kernel/eeh.c +++ b/arch/powerpc/kernel/eeh.c @@ -1068,7 +1068,7 @@ void eeh_add_device_early(struct pci_dn *pdn) struct pci_controller *phb; struct eeh_dev *edev = pdn_to_eeh_dev(pdn); - if (!edev || !eeh_enabled()) + if (!edev) return; if (!eeh_has_flag(EEH_PROBE_MODE_DEVTREE))