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wait queue in rtc.c rtc_read

Hello all,

I'm studying the code of rtc.c. When I look at the rtc_read function I fail to understand why the process is put on a wait queue. Aren't processes put on queue's when data in not available and then schedule()ed? Why isn't there a check for data first before it's put on a wait queue? For example after the: if (data != 0)
just wondering.

Richard

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