diff options
author | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2023-12-27 21:38:23 +0100 |
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committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2024-01-03 11:31:12 +0100 |
commit | 7d4b5d7a37bdd63a5a3371b988744b060d5bb86f (patch) | |
tree | 4a34c063468f1c17bdaca6aece40caf957543c9e /kernel/async.c | |
parent | 6aa09a5bccd8e224d917afdb4c278fc66aacde4d (diff) |
async: Introduce async_schedule_dev_nocall()
In preparation for subsequent changes, introduce a specialized variant
of async_schedule_dev() that will not invoke the argument function
synchronously when it cannot be scheduled for asynchronous execution.
The new function, async_schedule_dev_nocall(), will be used for fixing
possible deadlocks in the system-wide power management core code.
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Reviewed-by: Stanislaw Gruszka <stanislaw.gruszka@linux.intel.com> for the series.
Tested-by: Youngmin Nam <youngmin.nam@samsung.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'kernel/async.c')
-rw-r--r-- | kernel/async.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/kernel/async.c b/kernel/async.c index cffe6b4cff9f..673bba6bdf3a 100644 --- a/kernel/async.c +++ b/kernel/async.c @@ -244,6 +244,35 @@ async_cookie_t async_schedule_node(async_func_t func, void *data, int node) EXPORT_SYMBOL_GPL(async_schedule_node); /** + * async_schedule_dev_nocall - A simplified variant of async_schedule_dev() + * @func: function to execute asynchronously + * @dev: device argument to be passed to function + * + * @dev is used as both the argument for the function and to provide NUMA + * context for where to run the function. + * + * If the asynchronous execution of @func is scheduled successfully, return + * true. Otherwise, do nothing and return false, unlike async_schedule_dev() + * that will run the function synchronously then. + */ +bool async_schedule_dev_nocall(async_func_t func, struct device *dev) +{ + struct async_entry *entry; + + entry = kzalloc(sizeof(struct async_entry), GFP_KERNEL); + + /* Give up if there is no memory or too much work. */ + if (!entry || atomic_read(&entry_count) > MAX_WORK) { + kfree(entry); + return false; + } + + __async_schedule_node_domain(func, dev, dev_to_node(dev), + &async_dfl_domain, entry); + return true; +} + +/** * async_synchronize_full - synchronize all asynchronous function calls * * This function waits until all asynchronous function calls have been done. |