Patch "ipmi: fix SSIF not responding under certain cond." has been added to the 6.1-stable tree

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This is a note to let you know that I've just added the patch titled

    ipmi: fix SSIF not responding under certain cond.

to the 6.1-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     ipmi-fix-ssif-not-responding-under-certain-cond.patch
and it can be found in the queue-6.1 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 6d2555cde2918409b0331560e66f84a0ad4849c6 Mon Sep 17 00:00:00 2001
From: Zhang Yuchen <zhangyuchen.lcr@xxxxxxxxxxxxx>
Date: Wed, 12 Apr 2023 15:49:07 +0800
Subject: ipmi: fix SSIF not responding under certain cond.

From: Zhang Yuchen <zhangyuchen.lcr@xxxxxxxxxxxxx>

commit 6d2555cde2918409b0331560e66f84a0ad4849c6 upstream.

The ipmi communication is not restored after a specific version of BMC is
upgraded on our server.
The ipmi driver does not respond after printing the following log:

    ipmi_ssif: Invalid response getting flags: 1c 1

I found that after entering this branch, ssif_info->ssif_state always
holds SSIF_GETTING_FLAGS and never return to IDLE.

As a result, the driver cannot be loaded, because the driver status is
checked during the unload process and must be IDLE in shutdown_ssif():

        while (ssif_info->ssif_state != SSIF_IDLE)
                schedule_timeout(1);

The process trigger this problem is:

1. One msg timeout and next msg start send, and call
ssif_set_need_watch().

2. ssif_set_need_watch()->watch_timeout()->start_flag_fetch() change
ssif_state to SSIF_GETTING_FLAGS.

3. In msg_done_handler() ssif_state == SSIF_GETTING_FLAGS, if an error
message is received, the second branch does not modify the ssif_state.

4. All retry action need IS_SSIF_IDLE() == True. Include retry action in
watch_timeout(), msg_done_handler(). Sending msg does not work either.
SSIF_IDLE is also checked in start_next_msg().

5. The only thing that can be triggered in the SSIF driver is
watch_timeout(), after destory_user(), this timer will stop too.

So, if enter this branch, the ssif_state will remain SSIF_GETTING_FLAGS
and can't send msg, no timer started, can't unload.

We did a comparative test before and after adding this patch, and the
result is effective.

Fixes: 259307074bfc ("ipmi: Add SMBus interface driver (SSIF)")

Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Zhang Yuchen <zhangyuchen.lcr@xxxxxxxxxxxxx>
Message-Id: <20230412074907.80046-1-zhangyuchen.lcr@xxxxxxxxxxxxx>
Signed-off-by: Corey Minyard <minyard@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/char/ipmi/ipmi_ssif.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/char/ipmi/ipmi_ssif.c
+++ b/drivers/char/ipmi/ipmi_ssif.c
@@ -786,9 +786,9 @@ static void msg_done_handler(struct ssif
 		} else if (data[0] != (IPMI_NETFN_APP_REQUEST | 1) << 2
 			   || data[1] != IPMI_GET_MSG_FLAGS_CMD) {
 			/*
-			 * Don't abort here, maybe it was a queued
-			 * response to a previous command.
+			 * Recv error response, give up.
 			 */
+			ssif_info->ssif_state = SSIF_IDLE;
 			ipmi_ssif_unlock_cond(ssif_info, flags);
 			dev_warn(&ssif_info->client->dev,
 				 "Invalid response getting flags: %x %x\n",


Patches currently in stable-queue which might be from zhangyuchen.lcr@xxxxxxxxxxxxx are

queue-6.1/ipmi-fix-ssif-not-responding-under-certain-cond.patch



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