From: Milton Miller Date: Wed, 11 May 2011 12:24:58 +0000 (+0000) Subject: powerpc/pseries/iommu: Remove ddw property when destroying window X-Git-Tag: firefly_0821_release~7613^2~1375^2~11 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2573f6842201a00f139237e4b42ab16711b582af;p=firefly-linux-kernel-4.4.55.git powerpc/pseries/iommu: Remove ddw property when destroying window If we destroy the window, we need to remove the property recording that we setup the window. Otherwise the next kernel we kexec will be confused. Also we should remove the property if even if we don't find the ibm,ddw-applicable window or if one of the property sizes is unexpected; presumably these came from a prior kernel via kexec, and we will not be maintaining the window with respect to memory hotplug. Signed-off-by: Milton Miller Signed-off-by: Nishanth Aravamudan Signed-off-by: Benjamin Herrenschmidt --- diff --git a/arch/powerpc/platforms/pseries/iommu.c b/arch/powerpc/platforms/pseries/iommu.c index 05c101e7dcd7..a0421ac46d4e 100644 --- a/arch/powerpc/platforms/pseries/iommu.c +++ b/arch/powerpc/platforms/pseries/iommu.c @@ -665,9 +665,12 @@ static void remove_ddw(struct device_node *np) ddr_avail = of_get_property(np, "ibm,ddw-applicable", &len); win64 = of_find_property(np, DIRECT64_PROPNAME, NULL); - if (!win64 || !ddr_avail || len < 3 * sizeof(u32)) + if (!win64) return; + if (!ddr_avail || len < 3 * sizeof(u32) || win64->length < sizeof(*dwp)) + goto delprop; + dwp = win64->value; liobn = (u64)be32_to_cpu(dwp->liobn); @@ -690,8 +693,13 @@ static void remove_ddw(struct device_node *np) pr_debug("%s: successfully removed direct window: rtas returned " "%d to ibm,remove-pe-dma-window(%x) %llx\n", np->full_name, ret, ddr_avail[2], liobn); -} +delprop: + ret = of_remove_property(np, win64); + if (ret) + pr_warning("%s: failed to remove direct window property: %d\n" + np->full_name, ret); +} static u64 dupe_ddw_if_already_created(struct pci_dev *dev, struct device_node *pdn) {