linux-kernel - [PATCH AUTOSEL 6.6 20/33] s390/sclp: Fix sclp

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Message-ID: <20240709162224.31148-20-sashal@kernel.org>
Date: Tue,  9 Jul 2024 12:21:46 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Heiko Carstens <hca@...ux.ibm.com>,
	Peter Oberparleiter <oberpar@...ux.ibm.com>,
	Alexander Gordeev <agordeev@...ux.ibm.com>,
	Sasha Levin <sashal@...nel.org>,
	gor@...ux.ibm.com,
	justinstitt@...gle.com,
	linux-s390@...r.kernel.org
Subject: [PATCH AUTOSEL 6.6 20/33] s390/sclp: Fix sclp_init() cleanup on failure

From: Heiko Carstens <hca@...ux.ibm.com>

[ Upstream commit 6434b33faaa063df500af355ee6c3942e0f8d982 ]

If sclp_init() fails it only partially cleans up: if there are multiple
failing calls to sclp_init() sclp_state_change_event will be added several
times to sclp_reg_list, which results in the following warning:

------------[ cut here ]------------
list_add double add: new=000003ffe1598c10, prev=000003ffe1598bf0, next=000003ffe1598c10.
WARNING: CPU: 0 PID: 1 at lib/list_debug.c:35 __list_add_valid_or_report+0xde/0xf8
CPU: 0 PID: 1 Comm: swapper/0 Not tainted 6.10.0-rc3
Krnl PSW : 0404c00180000000 000003ffe0d6076a (__list_add_valid_or_report+0xe2/0xf8)
           R:0 T:1 IO:0 EX:0 Key:0 M:1 W:0 P:0 AS:3 CC:0 PM:0 RI:0 EA:3
...
Call Trace:
 [<000003ffe0d6076a>] __list_add_valid_or_report+0xe2/0xf8
([<000003ffe0d60766>] __list_add_valid_or_report+0xde/0xf8)
 [<000003ffe0a8d37e>] sclp_init+0x40e/0x450
 [<000003ffe00009f2>] do_one_initcall+0x42/0x1e0
 [<000003ffe15b77a6>] do_initcalls+0x126/0x150
 [<000003ffe15b7a0a>] kernel_init_freeable+0x1ba/0x1f8
 [<000003ffe0d6650e>] kernel_init+0x2e/0x180
 [<000003ffe000301c>] __ret_from_fork+0x3c/0x60
 [<000003ffe0d759ca>] ret_from_fork+0xa/0x30

Fix this by removing sclp_state_change_event from sclp_reg_list when
sclp_init() fails.

Reviewed-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@...ux.ibm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/s390/char/sclp.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/s390/char/sclp.c b/drivers/s390/char/sclp.c
index 8f74db689a0c2..ba10f9b8fac72 100644
--- a/drivers/s390/char/sclp.c
+++ b/drivers/s390/char/sclp.c
@@ -1293,6 +1293,7 @@ sclp_init(void)
 fail_unregister_reboot_notifier:
 	unregister_reboot_notifier(&sclp_reboot_notifier);
 fail_init_state_uninitialized:
+	list_del(&sclp_state_change_event.list);
 	sclp_init_state = sclp_init_state_uninitialized;
 	free_page((unsigned long) sclp_read_sccb);
 	free_page((unsigned long) sclp_init_sccb);
-- 
2.43.0