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ramlog: workaround the unsafe critical section

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thread1:                           thread2:
ramlog_addbuf()
    enter_critical_section()
    ramlog_pollnotify()
       foreach rl_list
             --> switch out
                                   ramlog_file_close
                                   enter_critical_section()
                                   list_delete()
                                   leave_critical_section()
             <--- switch back
       rl_list error
    leave_critical_section()

Signed-off-by: ligd <liguiding1@xiaomi.com>
This commit is contained in:
ligd 2024-07-25 22:52:52 +08:00 • committed by archer
parent 78d93eb628
commit 981bda5cf0
1 changed files with 14 additions and 0 deletions
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14
drivers/syslog/ramlog.c
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@ -337,6 +337,13 @@ static ssize_t ramlog_addbuf(FAR struct ramlog_dev_s *priv,
if (len > 0)
{
/* Lock the scheduler do NOT switch out */
if (!up_interrupt_context())
{
sched_lock();
}
#ifndef CONFIG_RAMLOG_NONBLOCKING
/* Are there threads waiting for read data? */
@ -345,6 +352,13 @@ static ssize_t ramlog_addbuf(FAR struct ramlog_dev_s *priv,
/* Notify all poll/select waiters that they can read from the FIFO */
ramlog_pollnotify(priv);
/* Unlock the scheduler */
if (!up_interrupt_context())
{
sched_unlock();
}
}
/* We always have to return the number of bytes requested and NOT the