From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: From: "Kirill A. Shutemov" To: Greg KH Cc: Miles J Penner , John Ronciak , Mika Westerberg , Tushar N Dave , "Kirill A. Shutemov" , "Kirill A. Shutemov" , Bjorn Helgaas , Yinghai Lu , Jesse Barnes , Amos Kong , "Rafael J. Wysocki" , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 3/3] PCI Hotplug: workaround for Thunderbolt on Intel DZ77RE-75K motherboard Date: Thu, 13 Dec 2012 17:31:48 +0200 Message-Id: <1355412708-20046-4-git-send-email-kirill.shutemov@linux.intel.com> In-Reply-To: <1355412708-20046-1-git-send-email-kirill.shutemov@linux.intel.com> References: <1355412708-20046-1-git-send-email-kirill.shutemov@linux.intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: From: "Kirill A. Shutemov" BIOS on Intel DZ77RE-75K motherboard notifies OS about Thunderbolt hotplug before devices behind Thunderbolt are ready to be enumerated. Let's delay enumeration by 2 seconds. Signed-off-by: Kirill A. Shutemov --- drivers/pci/hotplug/acpiphp_glue.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/pci/hotplug/acpiphp_glue.c b/drivers/pci/hotplug/acpiphp_glue.c index 1a2b3ca..165987a 100644 --- a/drivers/pci/hotplug/acpiphp_glue.c +++ b/drivers/pci/hotplug/acpiphp_glue.c @@ -49,6 +49,7 @@ #include #include #include +#include #include "../pci.h" #include "acpiphp.h" @@ -1327,6 +1328,19 @@ out: static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, void *context) { + unsigned long delay = 0; + const char *board_name; + + board_name = dmi_get_system_info(DMI_BOARD_NAME); + /* + * BIOS on Intel DZ77RE-75K motherboard notifies OS about Thunderbolt + * hotplug before devices behind Thunderbolt are ready to be + * enumerated. + * Let's delay enumeration by 2 seconds. + */ + if (board_name && !strcmp(board_name, "DZ77RE-75K")) + delay = 2 * HZ; + /* * Currently the code adds all hotplug events to the kacpid_wq * queue when it should add hotplug events to the kacpi_hotplug_wq. @@ -1336,7 +1350,7 @@ static void handle_hotplug_event_bridge(acpi_handle handle, u32 type, * don't deadlock on hotplug actions. */ alloc_acpiphp_hp_work(handle, type, context, - _handle_hotplug_event_bridge, 0); + _handle_hotplug_event_bridge, delay); } static void _handle_hotplug_event_func(struct work_struct *work) -- 1.7.10.4