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f0c3700221
[ Upstream commit 0541db8ee32c09463a72d0987382b3a3336b0043 ]
We encountered a warning that close_work was canceled before
initialization.
WARNING: CPU: 7 PID: 111103 at kernel/workqueue.c:3047 __flush_work+0x19e/0x1b0
Workqueue: events smc_lgr_terminate_work [smc]
RIP: 0010:__flush_work+0x19e/0x1b0
Call Trace:
? __wake_up_common+0x7a/0x190
? work_busy+0x80/0x80
__cancel_work_timer+0xe3/0x160
smc_close_cancel_work+0x1a/0x70 [smc]
smc_close_active_abort+0x207/0x360 [smc]
__smc_lgr_terminate.part.38+0xc8/0x180 [smc]
process_one_work+0x19e/0x340
worker_thread+0x30/0x370
? process_one_work+0x340/0x340
kthread+0x117/0x130
? __kthread_cancel_work+0x50/0x50
ret_from_fork+0x22/0x30
This is because when smc_close_cancel_work is triggered, e.g. the RDMA
driver is rmmod and the LGR is terminated, the conn->close_work is
flushed before initialization, resulting in WARN_ON(!work->func).
__smc_lgr_terminate | smc_connect_{rdma|ism}
-------------------------------------------------------------
| smc_conn_create
| \- smc_lgr_register_conn
for conn in lgr->conns_all |
\- smc_conn_kill |
\- smc_close_active_abort |
\- smc_close_cancel_work |
\- cancel_work_sync |
\- __flush_work |
(close_work) |
| smc_close_init
| \- INIT_WORK(&close_work)
So fix this by initializing close_work before establishing the
connection.
Fixes: 46c28dbd4c ("net/smc: no socket state changes in tasklet context")
Fixes: 413498440e ("net/smc: add SMC-D support in af_smc")
Signed-off-by: Wen Gu <guwen@linux.alibaba.com>
Reviewed-by: Wenjia Zhang <wenjia@linux.ibm.com>
Reviewed-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.