From f4cdf7ca9a1fdcca413157df19753f388a5a224e Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Wed, 19 Aug 2026 10:09:22 -0700 Subject: Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media Pull media updates from Mauro Carvalho Chehab: - v4l2-core: added ISP statistics support and per-block validation - v4l2-core: Allow unknown HDR10 white point and luminance - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor - New codec: Milos: VPU v2.0 codec support - isp driver: gained support for Dreamchip RPPX1 ISP framework - vsp1 driver: gained support for RZ/T2H and RZ/N2H - Novalake driver: gained CVS support for new NVL hardware - dvb-core: fix feed leak on failed DMX_ADD_PID - several driver fixes, cleanups and minor improvements * tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits) media: ipu-bridge: check all DMI entries when overriding sensor rotation media: v4l2-async: avoid deleting unlinked ASC entry on link error media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement media: intel/ipu6: fix async notifier cleanup leak on parse error media: staging/ipu7: fix async notifier UAF on probe error path media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem() media: rcar-isp: Fix VSPX reference leaks media: rcar-isp: Release ISPCORE resources media: i2c: imx415: Release runtime PM reference on VBLANK error media: i2c: imx415: Return test pattern write errors media: renesas: vsp1: Declare index variables in for loop statement media: renesas: vsp1: Make reset control optional to support platforms without a reset line media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs media: nxp: imx8-isi: Add additional 32-bit RGB format support media: nxp: imx8-isi: Add 16-bit raw Bayer format support media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks media: nxp: imx8-isi: Correct color map between V4L2 and ISI ... --- drivers/md/dm-vdo/thread-utils.c | 108 +++++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) create mode 100644 drivers/md/dm-vdo/thread-utils.c (limited to 'drivers/md/dm-vdo/thread-utils.c') diff --git a/drivers/md/dm-vdo/thread-utils.c b/drivers/md/dm-vdo/thread-utils.c new file mode 100644 index 000000000..826afc952 --- /dev/null +++ b/drivers/md/dm-vdo/thread-utils.c @@ -0,0 +1,108 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright 2023 Red Hat + */ + +#include "thread-utils.h" + +#include +#include +#include +#include +#include + +#include "errors.h" +#include "logger.h" +#include "memory-alloc.h" + +static struct hlist_head thread_list; +static struct mutex thread_mutex; + +struct thread { + void (*thread_function)(void *thread_data); + void *thread_data; + struct hlist_node thread_links; + struct task_struct *thread_task; + struct completion thread_done; +}; + +void vdo_initialize_threads_mutex(void) +{ + mutex_init(&thread_mutex); +} + +static int thread_starter(void *arg) +{ + struct registered_thread allocating_thread; + struct thread *thread = arg; + + thread->thread_task = current; + mutex_lock(&thread_mutex); + hlist_add_head(&thread->thread_links, &thread_list); + mutex_unlock(&thread_mutex); + vdo_register_allocating_thread(&allocating_thread, NULL); + thread->thread_function(thread->thread_data); + vdo_unregister_allocating_thread(); + complete(&thread->thread_done); + return 0; +} + +int vdo_create_thread(void (*thread_function)(void *), void *thread_data, + const char *name, struct thread **new_thread) +{ + char *name_colon = strchr(name, ':'); + char *my_name_colon = strchr(current->comm, ':'); + struct task_struct *task; + struct thread *thread; + int result; + + result = vdo_allocate(1, __func__, &thread); + if (result != VDO_SUCCESS) { + vdo_log_warning("Error allocating memory for %s", name); + return result; + } + + thread->thread_function = thread_function; + thread->thread_data = thread_data; + init_completion(&thread->thread_done); + /* + * Start the thread, with an appropriate thread name. + * + * If the name supplied contains a colon character, use that name. This causes uds module + * threads to have names like "uds:callbackW" and the main test runner thread to be named + * "zub:runtest". + * + * Otherwise if the current thread has a name containing a colon character, prefix the name + * supplied with the name of the current thread up to (and including) the colon character. + * Thus when the "kvdo0:dedupeQ" thread opens an index session, all the threads associated + * with that index will have names like "kvdo0:foo". + * + * Otherwise just use the name supplied. This should be a rare occurrence. + */ + if ((name_colon == NULL) && (my_name_colon != NULL)) { + task = kthread_run(thread_starter, thread, "%.*s:%s", + (int) (my_name_colon - current->comm), current->comm, + name); + } else { + task = kthread_run(thread_starter, thread, "%s", name); + } + + if (IS_ERR(task)) { + vdo_free(thread); + return PTR_ERR(task); + } + + *new_thread = thread; + return VDO_SUCCESS; +} + +void vdo_join_threads(struct thread *thread) +{ + while (wait_for_completion_interruptible(&thread->thread_done)) + fsleep(1000); + + mutex_lock(&thread_mutex); + hlist_del(&thread->thread_links); + mutex_unlock(&thread_mutex); + vdo_free(thread); +} -- cgit v1.3.1