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Subject[PATCH] ipmi: This patch decreases the IPMI message transaction time in Interrupt mode
Subject: [PATCH] This patch  decreases the IPMI message transaction time in Interrupt mode
---------------------------------------------------------------------------------------------
In function sender(), start_next_msg(smi_info) is when the driver is ready to send the data to BMC,
but counts on the timeout to start the transaction.In interrupt mode what I observed is that driver
simply wastes time, counting on the timer to trigger the transaction. What I have done here is to
cut the wait,and trigger the call to the handler.
This patch considerably decreases the IPMI transaction time (cuts off ~9ms for a single ipmitool transaction).

Signed-off-by: Srinivas_Gowda <srinivas_g_gowda@dell.com>
---
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 9397ab4..5d1e0ca 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -932,8 +932,10 @@ static void sender(void *send_info,
spin_unlock_irqrestore(&smi_info->msg_lock, flags);

spin_lock_irqsave(&smi_info->si_lock, flags);
- if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL)
+ if (smi_info->si_state == SI_NORMAL && smi_info->curr_msg == NULL) {
start_next_msg(smi_info);
+ mod_timer(&smi_info->si_timer, jiffies + 1);
+ }
spin_unlock_irqrestore(&smi_info->si_lock, flags);
}

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