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tty: extract tty_flip_buffer_commit() from tty_flip_buffer_push()
commit 716b105802
upstream.
We will need this new helper in the next patch.
Cc: Hillf Danton <hdanton@sina.com>
Cc: 一只狗 <chennbnbnb@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20220707082558.9250-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
c84986d097
commit
a4bb7ef2d6
1 changed files with 10 additions and 5 deletions
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@ -523,6 +523,15 @@ static void flush_to_ldisc(struct work_struct *work)
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}
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static inline void tty_flip_buffer_commit(struct tty_buffer *tail)
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{
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/*
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* Paired w/ acquire in flush_to_ldisc(); ensures flush_to_ldisc() sees
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* buffer data.
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*/
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smp_store_release(&tail->commit, tail->used);
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}
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/**
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* tty_flip_buffer_push - terminal
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* @port: tty port to push
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@ -538,11 +547,7 @@ void tty_flip_buffer_push(struct tty_port *port)
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{
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struct tty_bufhead *buf = &port->buf;
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/*
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* Paired w/ acquire in flush_to_ldisc(); ensures flush_to_ldisc() sees
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* buffer data.
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*/
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smp_store_release(&buf->tail->commit, buf->tail->used);
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tty_flip_buffer_commit(buf->tail);
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queue_work(system_unbound_wq, &buf->work);
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}
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EXPORT_SYMBOL(tty_flip_buffer_push);
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