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From:   Xianting Tian <tian.xianting@h3c.com>
To:     <minyard@acm.org>, <arnd@arndb.de>, <gregkh@linuxfoundation.org>
CC:     <openipmi-developer@lists.sourceforge.net>,
        <linux-kernel@vger.kernel.org>,
        Xianting Tian <tian.xianting@h3c.com>
Subject: [PATCH] ipmi: print current state when error
Date:   Tue, 15 Sep 2020 15:44:41 +0800
Message-ID: <20200915074441.4090-1-tian.xianting@h3c.com>
MIME-Version: 1.0
Content-Type: text/plain
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Print current state before returning IPMI_NOT_IN_MY_STATE_ERR,
we can know where this issue is coming from and possibly fix
the state machine.

Signed-off-by: Xianting Tian <tian.xianting@h3c.com>
---
 drivers/char/ipmi/ipmi_bt_sm.c   | 4 +++-
 drivers/char/ipmi/ipmi_kcs_sm.c  | 4 +++-
 drivers/char/ipmi/ipmi_smic_sm.c | 4 +++-
 3 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/drivers/char/ipmi/ipmi_bt_sm.c b/drivers/char/ipmi/ipmi_bt_sm.c
index f3f216cdf..2de0c6c30 100644
--- a/drivers/char/ipmi/ipmi_bt_sm.c
+++ b/drivers/char/ipmi/ipmi_bt_sm.c
@@ -213,8 +213,10 @@ static int bt_start_transaction(struct si_sm_data *bt,
 	if (bt->state == BT_STATE_LONG_BUSY)
 		return IPMI_NODE_BUSY_ERR;
 
-	if (bt->state != BT_STATE_IDLE)
+	if (bt->state != BT_STATE_IDLE) {
+		dev_warn(bt->io->dev, "BT is now in the state %d\n", bt->state);
 		return IPMI_NOT_IN_MY_STATE_ERR;
+	}
 
 	if (bt_debug & BT_DEBUG_MSG) {
 		dev_dbg(bt->io->dev, "+++++++++++++++++ New command\n");
diff --git a/drivers/char/ipmi/ipmi_kcs_sm.c b/drivers/char/ipmi/ipmi_kcs_sm.c
index 2e7cda08b..49ece4ba3 100644
--- a/drivers/char/ipmi/ipmi_kcs_sm.c
+++ b/drivers/char/ipmi/ipmi_kcs_sm.c
@@ -268,8 +268,10 @@ static int start_kcs_transaction(struct si_sm_data *kcs, unsigned char *data,
 	if (size > MAX_KCS_WRITE_SIZE)
 		return IPMI_REQ_LEN_EXCEEDED_ERR;
 
-	if ((kcs->state != KCS_IDLE) && (kcs->state != KCS_HOSED))
+	if ((kcs->state != KCS_IDLE) && (kcs->state != KCS_HOSED)) {
+		printk(KERN_WARNING, "KCS is now in the state %d\n", kcs->state);
 		return IPMI_NOT_IN_MY_STATE_ERR;
+	}
 
 	if (kcs_debug & KCS_DEBUG_MSG) {
 		printk(KERN_DEBUG "start_kcs_transaction -");
diff --git a/drivers/char/ipmi/ipmi_smic_sm.c b/drivers/char/ipmi/ipmi_smic_sm.c
index b6225bba2..690d4f53e 100644
--- a/drivers/char/ipmi/ipmi_smic_sm.c
+++ b/drivers/char/ipmi/ipmi_smic_sm.c
@@ -126,8 +126,10 @@ static int start_smic_transaction(struct si_sm_data *smic,
 	if (size > MAX_SMIC_WRITE_SIZE)
 		return IPMI_REQ_LEN_EXCEEDED_ERR;
 
-	if ((smic->state != SMIC_IDLE) && (smic->state != SMIC_HOSED))
+	if ((smic->state != SMIC_IDLE) && (smic->state != SMIC_HOSED)) {
+		printk(KERN_WARNING, "SMIC is now in the state %d\n", smic->state);
 		return IPMI_NOT_IN_MY_STATE_ERR;
+	}
 
 	if (smic_debug & SMIC_DEBUG_MSG) {
 		printk(KERN_DEBUG "start_smic_transaction -");
-- 
2.17.1