stm class: dummy_stm: Add link callback for fault injection (adcde635) · Commits · 戴 / test

STM device's link callback has the power to abort master/channel assignment by returning a negative error code. Use this in dummy stm device to optionally abort assigning certain channel IDs. This is useful as fault injection into the stm class core, for testing purposes. Signed-off-by:

Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by:

Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/hwtracing/stm/dummy_stm.c

+14 −0

Original line number	Diff line number	Diff line
		@@ -50,6 +50,19 @@ module_param(nr_dummies, int, 0600);

		static unsigned int dummy_stm_nr;

		static unsigned int fail_mode;

		module_param(fail_mode, int, 0600);

		static int dummy_stm_link(struct stm_data *data, unsigned int master,
		unsigned int channel)
		{
		if (fail_mode && (channel & fail_mode))
		return -EINVAL;

		return 0;
		}

		static int dummy_stm_init(void)
		{
		int i, ret = -ENOMEM, __nr_dummies = ACCESS_ONCE(nr_dummies);
		@@ -66,6 +79,7 @@ static int dummy_stm_init(void)
		dummy_stm[i].sw_end = 0xffff;
		dummy_stm[i].sw_nchannels = 0xffff;
		dummy_stm[i].packet = dummy_stm_packet;
		dummy_stm[i].link = dummy_stm_link;

		ret = stm_register_device(NULL, &dummy_stm[i], THIS_MODULE);
		if (ret)

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