efi: clocksoure: make sure the meassured frequency is valid
Some EFI implementations have a even slower tick rate and the meassured frequency may be zero. Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de> Acked-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -71,6 +71,10 @@ static int efi_cs_init(struct clocksource *cs)
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uint64_t nb_100ns;
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freq = ticks_freq_x86();
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if (freq == 0) {
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BS->close_event(efi_cs_evt);
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return -ENODEV;
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}
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nb_100ns = 10 * 1000 * 1000 / freq;
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pr_warn("EFI Event timer too slow freq = %llu Hz\n", freq);
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efiret = BS->set_timer(efi_cs_evt, EFI_TIMER_PERIODIC, nb_100ns);
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