driver-core: platform_driver_probe() must probe synchronously (5c36eb2a) · Commits · 戴 / test

Because platform_driver_probe() checks, after trying to register driver, if there are any devices that driver successfully bound to, driver's probe routine must be run synchronously. Signed-off-by:

Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/platform.c

+13 −0

Original line number	Diff line number	Diff line
		@@ -613,6 +613,19 @@ int __init_or_module __platform_driver_probe(struct platform_driver *drv,
		{
		int retval, code;

		if (drv->driver.probe_type == PROBE_PREFER_ASYNCHRONOUS) {
		pr_err("%s: drivers registered with %s can not be probed asynchronously\n",
		drv->driver.name, __func__);
		return -EINVAL;
		}

		/*
		* We have to run our probes synchronously because we check if
		* we find any devices to bind to and exit with error if there
		* are any.
		*/
		drv->driver.probe_type = PROBE_FORCE_SYNCHRONOUS;

		/*
		* Prevent driver from requesting probe deferral to avoid further
		* futile probe attempts.

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