* The purpose of calling init_waitqueue_head()
@ 2014-02-22 6:03 m silverstri
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From: m silverstri @ 2014-02-22 6:03 UTC (permalink / raw)
To: kernelnewbies
Hi,
I am trying to understanding a linux driver code here:
https://android.googlesource.com/kernel/exynos/+/a6a1de6334417e0800440cdf971270df6f90b2fa/drivers/media/video/exynos/jpeg/
In here
https://android.googlesource.com/kernel/exynos/+/a6a1de6334417e0800440cdf971270df6f90b2fa/drivers/media/video/exynos/jpeg/jpeg_dev.c,
it calls 'init_waitqueue_head() where wq is a "wait_queue_head_t
wq;"
mutex_init(&ctrl->lock);
init_waitqueue_head(&ctrl->wq);
But I search the whole directory for wq usage, I don't find anywhere wq is used.
Can you please tell me what is the purpose of calling "init_waitqueue_head"?
Thank you.
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