[PATCH 6.18 191/333] ipmi:si: Handle waiting messages when BMC failure detected

Greg Kroah-Hartman
2026-03-17T17:18:43Z

From: Corey Minyard <corey@minyard.net>

commit 52c9ee202edd21d0599ac3b5a6fe1da2a2f053e5 upstream.

If a BMC failure is detected, the current message is returned with an
error. However, if there was a waiting message, it would not be
handled.

Add a check for the waiting message after handling the current message.

Suggested-by: Guenter Roeck <linux@roeck-us.net>
Reported-by: Rafael J. Wysocki <rafael@kernel.org>
Closes: https://lore.kernel.org/linux-acpi/CAK8fFZ58fidGUCHi5WFX0uoTPzveUUDzT=k=AAm4yWo3bAuCFg@mail.gmail.com/
Fixes: bc3a9d217755 ("ipmi:si: Gracefully handle if the BMC is non-functional")
Cc: stable@vger.kernel.org # 4.18
Signed-off-by: Corey Minyard <corey@minyard.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/char/ipmi/ipmi_si_intf.c | 6 ++++++
1 file changed, 6 insertions(+)

--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -810,6 +810,12 @@ restart:
*/
return_hosed_msg(smi_info, IPMI_BUS_ERR);
}
+ if (smi_info->waiting_msg != NULL) {
+ /* Also handle if there was a message waiting. */
+ smi_info->curr_msg = smi_info->waiting_msg;
+ smi_info->waiting_msg = NULL;
+ return_hosed_msg(smi_info, IPMI_BUS_ERR);
+ }
smi_mod_timer(smi_info, jiffies + SI_TIMEOUT_HOSED);
goto out;
}