From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: Yinghai Lu To: Bjorn Helgaas , David Miller , Benjamin Herrenschmidt , Wei Yang , TJ , Yijing Wang , Khalid Aziz Cc: linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Yinghai Lu Subject: [PATCH v10 41/59] PCI: Skip required+optional if there is no optional Date: Wed, 24 Feb 2016 18:12:32 -0800 Message-Id: <1456366370-28995-42-git-send-email-yinghai@kernel.org> In-Reply-To: <1456366370-28995-1-git-send-email-yinghai@kernel.org> References: <1456366370-28995-1-git-send-email-yinghai@kernel.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: If the bridge does not support hotplug and has no child with sriov support, We will not have optional resources. We could get out early and don't try required+optional allocation. Also in the loop that update res with optional add info, skip resource that add_size is 0. Signed-off-by: Yinghai Lu --- drivers/pci/setup-bus.c | 32 +++++++++++++++++++++++++++++--- 1 file changed, 29 insertions(+), 3 deletions(-) diff --git a/drivers/pci/setup-bus.c b/drivers/pci/setup-bus.c index 6ed7c85..2f5e4d1 100644 --- a/drivers/pci/setup-bus.c +++ b/drivers/pci/setup-bus.c @@ -450,6 +450,24 @@ static bool pci_need_to_release(unsigned long mask, struct resource *res) return false; /* should not get here */ } +static bool has_addon(struct list_head *head, + struct list_head *realloc_head) +{ + int add_count = 0; + struct pci_dev_resource *dev_res, *tmp_res; + + /* check if we have add really */ + list_for_each_entry(dev_res, head, list) { + tmp_res = res_to_dev_res(realloc_head, dev_res->res); + if (!tmp_res || !tmp_res->add_size) + continue; + + add_count++; + } + + return add_count != 0; +} + static bool save_resources(struct list_head *head, struct list_head *save_head) { @@ -481,16 +499,24 @@ static bool __assign_resources_required_optional_sorted(struct list_head *head, struct pci_dev_resource *save_res; struct pci_dev_resource *dev_res, *tmp_res; unsigned long fail_type; - resource_size_t add_align; + resource_size_t add_align, add_size; struct resource *res; + if (!has_addon(head, realloc_head)) + return false; + if (!save_resources(head, &save_head)) return false; /* Update res in head list with add_size in realloc_head list */ list_for_each_entry(dev_res, head, list) { res = dev_res->res; - res->end += get_res_add_size(realloc_head, res); + add_size = get_res_add_size(realloc_head, res); + + if (!add_size) + continue; + + res->end += add_size; /* * There are two kinds of additional resources in the list: @@ -578,7 +604,7 @@ static void __assign_resources_sorted(struct list_head *head, */ /* Check required+optional add */ - if (realloc_head && !list_empty(realloc_head) && + if (realloc_head && __assign_resources_required_optional_sorted(head, realloc_head)) return; -- 1.8.4.5