From 034dd340b08be1f2f0477ad16131d609f9dbd53c Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 30 Aug 2026 09:22:00 -0700 Subject: Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace Pull tracing fixes from Steven Rostedt: - Fix error output of boot instance creation failure Currently if a boot instance creation fails, instead of printing out the name of the instance that failed, it prints "(null)". That is because it prints "cur_str" that had already been processed by strsep(). Print the saved name instead. While at it, print the error code of the failure. - Fix use-after-free for same named historgrams Histograms can be named so that they can be used in multiple events. But if the named histogram has a variable attached, the second event that uses the named histogram which duplicates it and needs to free the original after duplication leaves the old variable in place and still visible. If another histogram uses than variable, it will use the stale one which will try to reference the freed duplicate histogram and crash the kernel. Free the duplicate variables along with the duplicated histogram data. - Check return value of kthread_run() in event self test The events self tests uses a kthread for testing but does not check if it succeeded in creating a kthread. If the kthread creation were to fail, the code will still try to call kthread_stop() on the error returned. - Fix race between reading trace_pipe and updating subbuffer size If a user is reading the trace_pipe file at the same time they update the ring buffer sub-buffer size, can cause the trace_pipe read to read stale data. Add trace_access_lock() around updating the ring buffer sub-buffer size. - Fix eventfs_inode on failure path in creation of the events directory In the creation of the "events" directory, if after allocating the eventfs_inode a failure is detected, it calls cleanup_ei() which calls free_ei(). The free_ei() will test if eventfs_inode being freed has no children. It is a bug if it does. But on the failure case of the creation of the "events" directory, the children lists have not yet been initialized and the free will trigger a warning because list_empty() on an uninitialized list returns false. Move the initialization into init_ei() where it makes more sense and makes sure that a created eventfs_inode has its lists initialized upon creation. - Check return value of kthread_run() in ftrace direct sample code The sample code that shows how to use the ftrace direct calls does not test the return of kthread_run() to see if it succeeds. Return a failure if the kthread_run() doesn't succeed. - Clear user events state on fork in case of alloc failure On fork, the child gets a pointer to the parent's user events state. It makes a copy of it then updates the child's pointer to it. But if the allocation fails, the duplication function leaves the child with a pointer to its parent's descriptor. When the child cleans up its data, it will free the parent's descriptor while the parent is still using it. In the duplication function, set the child's user_event_mm to NULL before testing if the allocation succeeded, and when it exits it will not free the parent's descriptor. - Fix retry exhaustion in simple ring buffer reader swap simple_ring_buffer_swap_reader_page() starts with retry set to 8 and post-decrements it only after a failed link replacement. On the final attempt, a successful replacement leaves retry at zero, while a failed replacement leaves it at -1. But the check for success expects the retry value to be non-zero and exits with an error on zero. This is the opposite result. Fix it. - Fail nicely when the remote swap_reader_page() returns an error Currently, if the swap_reader_page() of a remote buffer fails, it triggers a WARN_ON_ONCE() and continues normally. Instead, have it exit with an error and a pr_warn() print instead of a full WARNING. * tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: ring-buffer: Stop remote reader update when page swap fails tracing: Fix retry exhaustion in simple ring buffer reader swap tracing/user_events: Clear copied tracing state before fork duplication samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify eventfs: Initialize ei->children and ei->list in init_ei() tracing: Fix use-after-free in trace_pipe read on sub-buffer order change tracing: Fix crash passing ERR_PTR to kthread_stop() tracing: Fix use-after-free with same-name named triggers tracing: Fix logged instance name on creation failure --- drivers/mfd/vx855.c | 123 ++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) create mode 100644 drivers/mfd/vx855.c (limited to 'drivers/mfd/vx855.c') diff --git a/drivers/mfd/vx855.c b/drivers/mfd/vx855.c new file mode 100644 index 000000000..985f81c17 --- /dev/null +++ b/drivers/mfd/vx855.c @@ -0,0 +1,123 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Linux multi-function-device driver (MFD) for the integrated peripherals + * of the VIA VX855 chipset + * + * Copyright (C) 2009 VIA Technologies, Inc. + * Copyright (C) 2010 One Laptop per Child + * Author: Harald Welte + * All rights reserved. + */ + +#include +#include +#include +#include +#include +#include + +/* offset into pci config space indicating the 16bit register containing + * the power management IO space base */ +#define VX855_CFG_PMIO_OFFSET 0x88 + +/* ACPI I/O Space registers */ +#define VX855_PMIO_ACPI 0x00 +#define VX855_PMIO_ACPI_LEN 0x0b + +/* Processor Power Management */ +#define VX855_PMIO_PPM 0x10 +#define VX855_PMIO_PPM_LEN 0x08 + +/* General Purpose Power Management */ +#define VX855_PMIO_GPPM 0x20 +#define VX855_PMIO_R_GPI 0x48 +#define VX855_PMIO_R_GPO 0x4c +#define VX855_PMIO_GPPM_LEN 0x33 + +#define VSPIC_MMIO_SIZE 0x1000 + +static struct resource vx855_gpio_resources[] = { + { + .flags = IORESOURCE_IO, + }, + { + .flags = IORESOURCE_IO, + }, +}; + +static const struct mfd_cell vx855_cells[] = { + { + .name = "vx855_gpio", + .num_resources = ARRAY_SIZE(vx855_gpio_resources), + .resources = vx855_gpio_resources, + + /* we must ignore resource conflicts, for reasons outlined in + * the vx855_gpio driver */ + .ignore_resource_conflicts = true, + }, +}; + +static int vx855_probe(struct pci_dev *pdev, + const struct pci_device_id *id) +{ + int ret; + u16 gpio_io_offset; + + ret = pci_enable_device(pdev); + if (ret) + return -ENODEV; + + pci_read_config_word(pdev, VX855_CFG_PMIO_OFFSET, &gpio_io_offset); + if (!gpio_io_offset) { + dev_warn(&pdev->dev, + "BIOS did not assign PMIO base offset?!?\n"); + ret = -ENODEV; + goto out; + } + + /* mask out the lowest seven bits, as they are always zero, but + * hardware returns them as 0x01 */ + gpio_io_offset &= 0xff80; + + /* As the region identified here includes many non-GPIO things, we + * only work with the specific registers that concern us. */ + vx855_gpio_resources[0].start = gpio_io_offset + VX855_PMIO_R_GPI; + vx855_gpio_resources[0].end = vx855_gpio_resources[0].start + 3; + vx855_gpio_resources[1].start = gpio_io_offset + VX855_PMIO_R_GPO; + vx855_gpio_resources[1].end = vx855_gpio_resources[1].start + 3; + + ret = mfd_add_devices(&pdev->dev, -1, vx855_cells, ARRAY_SIZE(vx855_cells), + NULL, 0, NULL); + + /* we always return -ENODEV here in order to enable other + * drivers like old, not-yet-platform_device ported i2c-viapro */ + return -ENODEV; +out: + pci_disable_device(pdev); + return ret; +} + +static void vx855_remove(struct pci_dev *pdev) +{ + mfd_remove_devices(&pdev->dev); + pci_disable_device(pdev); +} + +static const struct pci_device_id vx855_pci_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_VIA, PCI_DEVICE_ID_VIA_VX855) }, + { 0, } +}; +MODULE_DEVICE_TABLE(pci, vx855_pci_tbl); + +static struct pci_driver vx855_pci_driver = { + .name = "vx855", + .id_table = vx855_pci_tbl, + .probe = vx855_probe, + .remove = vx855_remove, +}; + +module_pci_driver(vx855_pci_driver); + +MODULE_LICENSE("GPL"); +MODULE_AUTHOR("Harald Welte "); +MODULE_DESCRIPTION("Driver for the VIA VX855 chipset"); -- cgit v1.3.1