This is a note to let you know that I've just added the patch titled hwtracing: hisi_ptt: Only add the supported devices to the filters list to the 6.1-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: hwtracing-hisi_ptt-only-add-the-supported-devices-to.patch and it can be found in the queue-6.1 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit f33d7d1b9f712cf9450528754f2e6787cb56ac6b Author: Yicong Yang <yangyicong@xxxxxxxxxxxxx> Date: Thu Jan 12 19:22:00 2023 +0800 hwtracing: hisi_ptt: Only add the supported devices to the filters list [ Upstream commit b8d976c7d41a28c0fccf22c7113be9a29dc07e5c ] The PTT device can only support the devices on the same PCIe core, within BDF range [lower_bdf, upper_bdf]. It's not correct to assume the devices on the root bus are from the same PCIe core, there are cases that root ports from different PCIe core are sharing the same bus. So check when initializing the filters list. Fixes: ff0de066b463 ("hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device") Signed-off-by: Yicong Yang <yangyicong@xxxxxxxxxxxxx> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> Signed-off-by: Suzuki K Poulose <suzuki.poulose@xxxxxxx> Link: https://lore.kernel.org/r/20230112112201.16283-1-yangyicong@xxxxxxxxxx Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c index 5d5526aa60c40..30f1525639b57 100644 --- a/drivers/hwtracing/ptt/hisi_ptt.c +++ b/drivers/hwtracing/ptt/hisi_ptt.c @@ -356,8 +356,18 @@ static int hisi_ptt_register_irq(struct hisi_ptt *hisi_ptt) static int hisi_ptt_init_filters(struct pci_dev *pdev, void *data) { + struct pci_dev *root_port = pcie_find_root_port(pdev); struct hisi_ptt_filter_desc *filter; struct hisi_ptt *hisi_ptt = data; + u32 port_devid; + + if (!root_port) + return 0; + + port_devid = PCI_DEVID(root_port->bus->number, root_port->devfn); + if (port_devid < hisi_ptt->lower_bdf || + port_devid > hisi_ptt->upper_bdf) + return 0; /* * We won't fail the probe if filter allocation failed here. The filters