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ipmi: Don't flush messages in sender() in run-to-completion mode

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When flushing queued messages in run-to-completion mode,
smi_event_handler() is recursively called.

flush_messages()
 smi_event_handler()
  handle_transaction_done()
   deliver_recv_msg()
    ipmi_smi_msg_received()
     smi_recv_tasklet()
      sender()
       flush_messages()
        smi_event_handler()
         ...

The depth of the recursive call depends on the number of queued
messages, so it can cause a stack overflow if many messages have
been queued.

To solve this problem, this patch removes flush_messages()
from sender()@ipmi_si_intf.c.  Instead, add flush_messages() to
caller side of sender() if needed.  Additionally, to implement this,
add new handler flush_messages to struct ipmi_smi_handlers.

Signed-off-by: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>

Fixed up a comment and some spacing issues.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
This commit is contained in:
Hidehiro Kawai 2015-07-27 14:55:16 +09:00 • committed by Corey Minyard
parent e45361d733
commit 82802f968b
3 changed files with 13 additions and 5 deletions
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5
include/linux/ipmi_smi.h
View file

@ -115,6 +115,11 @@ struct ipmi_smi_handlers {
implement it. */
void (*set_need_watch)(void *send_info, bool enable);
/*
* Called when flushing all pending messages.
*/
void (*flush_messages)(void *send_info);
/* Called when the interface should go into "run to
completion" mode. If this call sets the value to true, the
interface should make sure that all messages are flushed