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Krzysztof Czurylo 04050bf1a7 RDMA/irdma: Fix data race in irdma_sc_ccq_arm 
[ Upstream commit a521928164 ]

Adds a lock around irdma_sc_ccq_arm body to prevent inter-thread data race.
Fixes data race in irdma_sc_ccq_arm() reported by KCSAN:

BUG: KCSAN: data-race in irdma_sc_ccq_arm [irdma] / irdma_sc_ccq_arm [irdma]

read to 0xffff9d51b4034220 of 8 bytes by task 255 on cpu 11:
 irdma_sc_ccq_arm+0x36/0xd0 [irdma]
 irdma_cqp_ce_handler+0x300/0x310 [irdma]
 cqp_compl_worker+0x2a/0x40 [irdma]
 process_one_work+0x402/0x7e0
 worker_thread+0xb3/0x6d0
 kthread+0x178/0x1a0
 ret_from_fork+0x2c/0x50

write to 0xffff9d51b4034220 of 8 bytes by task 89 on cpu 3:
 irdma_sc_ccq_arm+0x7e/0xd0 [irdma]
 irdma_cqp_ce_handler+0x300/0x310 [irdma]
 irdma_wait_event+0xd4/0x3e0 [irdma]
 irdma_handle_cqp_op+0xa5/0x220 [irdma]
 irdma_hw_flush_wqes+0xb1/0x300 [irdma]
 irdma_flush_wqes+0x22e/0x3a0 [irdma]
 irdma_cm_disconn_true+0x4c7/0x5d0 [irdma]
 irdma_disconnect_worker+0x35/0x50 [irdma]
 process_one_work+0x402/0x7e0
 worker_thread+0xb3/0x6d0
 kthread+0x178/0x1a0
 ret_from_fork+0x2c/0x50

value changed: 0x0000000000024000 -> 0x0000000000034000

Fixes: 3f49d68425 ("RDMA/irdma: Implement HW Admin Queue OPs")
Signed-off-by: Krzysztof Czurylo <krzysztof.czurylo@intel.com>
Signed-off-by: Tatyana Nikolova <tatyana.e.nikolova@intel.com>
Link: https://patch.msgid.link/20251125025350.180-2-tatyana.e.nikolova@intel.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-01-19 13:09:33 +01:00
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README 

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.