[PATCH 2/4] ipmi: Disable sysfs access and requests in maintenance mode

[Corey Minyard <corey@minyard.net>]

If the driver goes into any maintenance mode, disable sysfs access until
it is done.

If the driver goes into reset maintenance mode, disable all messages
until it is done.

Signed-off-by: Corey Minyard <corey@minyard.net>
---
 drivers/char/ipmi/ipmi_msghandler.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index f124c0b33db8..72f5f4a0c056 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -2338,6 +2338,11 @@ static int i_ipmi_request(struct ipmi_user     *user,
 
 	if (!run_to_completion)
 		mutex_lock(&intf->users_mutex);
+	if (intf->maintenance_mode_state == IPMI_MAINTENANCE_MODE_STATE_RESET) {
+		/* No messages while the BMC is in reset. */
+		rv = -EBUSY;
+		goto out_err;
+	}
 	if (intf->in_shutdown) {
 		rv = -ENODEV;
 		goto out_err;
@@ -2639,6 +2644,12 @@ static int __bmc_get_device_id(struct ipmi_smi *intf, struct bmc_device *bmc,
 	    (bmc->dyn_id_set && time_is_after_jiffies(bmc->dyn_id_expiry)))
 		goto out_noprocessing;
 
+	/* Don't allow sysfs access when in maintenance mode. */
+	if (intf->maintenance_mode_state) {
+		rv = -EBUSY;
+		goto out_noprocessing;
+	}
+
 	prev_guid_set = bmc->dyn_guid_set;
 	__get_guid(intf);
 
-- 
2.43.0