Messages in this thread | | | Date | Mon, 16 Apr 2018 11:05:01 -0400 (EDT) | Subject | Re: [PATCH v3] net: davicom: dm9000: Avoid spinlock recursion during dm9000_timeout routine | From | David Miller <> |
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From: Liu Xiang <liu.xiang6@zte.com.cn> Date: Sat, 14 Apr 2018 16:50:34 +0800
> +static bool dm9000_current_in_timeout(struct board_info *db) > +{ > + bool ret = false; > + > + preempt_disable(); > + ret = (db->timeout_cpu == smp_processor_id()); > + preempt_enable();
This doesn't work.
As soon as you do preempt_enable(), smp_processor_id() can change.
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