ipmi_ssif: unlock on allocation failure

BugLink: http://bugs.launchpad.net/bugs/1765010

[ Upstream commit cf9806f3 ]

We should unlock and re-enable IRQs if this allocation fails.

Fixes: 25930707 ("ipmi: Add SMBus interface driver (SSIF) ")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Juerg Haefliger <juergh@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

drivers/char/ipmi/ipmi_ssif.c

@@ -409,6 +409,7 @@ static void start_event_fetch(struct ssif_info *ssif_info, unsigned long *flags)
 	msg = ipmi_alloc_smi_msg();
 	if (!msg) {
 		ssif_info->ssif_state = SSIF_NORMAL;
+		ipmi_ssif_unlock_cond(ssif_info, flags);
 		return;
 	}
 
@@ -431,6 +432,7 @@ static void start_recv_msg_fetch(struct ssif_info *ssif_info,
 	msg = ipmi_alloc_smi_msg();
 	if (!msg) {
 		ssif_info->ssif_state = SSIF_NORMAL;
+		ipmi_ssif_unlock_cond(ssif_info, flags);
 		return;
 	}