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Guangguan Wang f5146e3ef0 net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add 
While doing smcr_port_add, there maybe linkgroup add into or delete
from smc_lgr_list.list at the same time, which may result kernel crash.
So, use smc_lgr_list.lock to protect smc_lgr_list.list iterate in
smcr_port_add.

The crash calltrace show below:
BUG: kernel NULL pointer dereference, address: 0000000000000000
PGD 0 P4D 0
Oops: 0000 [#1] SMP NOPTI
CPU: 0 PID: 559726 Comm: kworker/0:92 Kdump: loaded Tainted: G
Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 449e491 04/01/2014
Workqueue: events smc_ib_port_event_work [smc]
RIP: 0010:smcr_port_add+0xa6/0xf0 [smc]
RSP: 0000:ffffa5a2c8f67de0 EFLAGS: 00010297
RAX: 0000000000000001 RBX: ffff9935e0650000 RCX: 0000000000000000
RDX: 0000000000000010 RSI: ffff9935e0654290 RDI: ffff9935c8560000
RBP: 0000000000000000 R08: 0000000000000000 R09: ffff9934c0401918
R10: 0000000000000000 R11: ffffffffb4a5c278 R12: ffff99364029aae4
R13: ffff99364029aa00 R14: 00000000ffffffed R15: ffff99364029ab08
FS:  0000000000000000(0000) GS:ffff994380600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000f06a10003 CR4: 0000000002770ef0
PKRU: 55555554
Call Trace:
 smc_ib_port_event_work+0x18f/0x380 [smc]
 process_one_work+0x19b/0x340
 worker_thread+0x30/0x370
 ? process_one_work+0x340/0x340
 kthread+0x114/0x130
 ? __kthread_cancel_work+0x50/0x50
 ret_from_fork+0x1f/0x30

Fixes: 1f90a05d9ff9 ("net/smc: add smcr_port_add() and smcr_link_up() processing")
Signed-off-by: Guangguan Wang <guangguan.wang@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2023-09-10 19:31:42 +01:00
..
af_smc.c
net: annotate data-races around sk->sk_lingertime
2023-08-21 07:41:57 +01:00
Kconfig
treewide: replace '---help---' in Kconfig files with 'help'
2020-06-14 01:57:21 +09:00
Makefile
net/smc: fix compile warning for smc_sysctl
2022-03-07 11:59:17 +00:00
smc_cdc.c
net/smc: fix NULL sndbuf_desc in smc_cdc_tx_handler()
2023-03-13 16:03:58 -07:00
smc_cdc.h
net/smc: fix kernel panic caused by race of smc_sock
2021-12-28 12:42:45 +00:00
smc_clc.c
net/smc: support max links per lgr negotiation in clc handshake
2023-08-19 12:46:53 +01:00
smc_clc.h
net/smc: support max links per lgr negotiation in clc handshake
2023-08-19 12:46:53 +01:00
smc_close.c
net: deal with most data-races in sk_wait_event()
2023-05-10 10:03:32 +01:00
smc_close.h
net/smc: remove close abort worker
2019-10-22 11:23:44 -07:00
smc_core.c
net/smc: use smc_lgr_list.lock to protect smc_lgr_list.list iterate in smcr_port_add
2023-09-10 19:31:42 +01:00
smc_core.h
net/smc: support max links per lgr negotiation in clc handshake
2023-08-19 12:46:53 +01:00
smc_diag.c
net/smc: Separate SMC-D and ISM APIs
2023-01-25 09:46:48 +00:00
smc_ib.c
mm, treewide: redefine MAX_ORDER sanely
2023-04-05 19:42:46 -07:00
smc_ib.h
net/smc: Remove unused function declarations
2023-07-31 14:40:26 -07:00
smc_ism.c
net/smc: Introduce explicit check for v2 support
2023-03-15 08:18:35 +00:00
smc_ism.h
net/smc: Register SMC-D as ISM client
2023-01-25 09:46:48 +00:00
smc_llc.c
net/smc: support max links per lgr negotiation in clc handshake
2023-08-19 12:46:53 +01:00
smc_llc.h
net/smc: Introduce a specific sysctl for TEST_LINK time
2022-09-22 12:58:21 +02:00
smc_netlink.c
genetlink: start to validate reserved header bytes
2022-08-29 12:47:15 +01:00
smc_netlink.h
net/smc: add support for user defined EIDs
2021-09-14 12:49:10 +01:00
smc_netns.h
net/smc: introduce list of pnetids for Ethernet devices
2020-09-28 15:19:03 -07:00
smc_pnet.c
net/smc: De-tangle ism and smc device initialization
2023-01-25 09:46:49 +00:00
smc_pnet.h
net/smc: Use a mutex for locking "struct smc_pnettable"
2022-02-24 09:09:33 -08:00
smc_rx.c
net: deal with most data-races in sk_wait_event()
2023-05-10 10:03:32 +01:00
smc_rx.h
…
smc_stats.c
smc: Drop smc_sendpage() in favour of smc_sendmsg() + MSG_SPLICE_PAGES
2023-06-24 15:50:12 -07:00
smc_stats.h
net/smc: bugfix for smcr v2 server connect success statistic
2023-09-10 19:31:42 +01:00
smc_sysctl.c
sysctl-6.6-rc1
2023-08-29 17:39:15 -07:00
smc_sysctl.h
net/smc: fix -Wmissing-prototypes warning when CONFIG_SYSCTL not set
2022-03-09 20:02:35 -08:00
smc_tracepoint.c
net/smc: Introduce tracepoint for smcr link down
2021-11-01 13:39:14 +00:00
smc_tracepoint.h
net/smc: Add net namespace for tracepoints
2022-01-02 12:07:39 +00:00
smc_tx.c
smc: Drop smc_sendpage() in favour of smc_sendmsg() + MSG_SPLICE_PAGES
2023-06-24 15:50:12 -07:00
smc_tx.h
smc: Drop smc_sendpage() in favour of smc_sendmsg() + MSG_SPLICE_PAGES
2023-06-24 15:50:12 -07:00
smc_wr.c
net/smc: Use percpu ref for wr tx reference
2023-03-17 08:59:01 +00:00
smc_wr.h
net/smc: Use percpu ref for wr tx reference
2023-03-17 08:59:01 +00:00
smc.h
net/smc: support smc release version negotiation in clc handshake
2023-08-19 12:46:52 +01:00