net/smc: replace mutex rmbs_lock and sndbufs_lock with rw_semaphore

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[ Upstream commit aff7bfed90 ]

It's clear that rmbs_lock and sndbufs_lock are aims to protect the
rmbs list or the sndbufs list.

During connection establieshment, smc_buf_get_slot() will always
be invoked, and it only performs read semantics in rmbs list and
sndbufs list.

Based on the above considerations, we replace mutex with rw_semaphore.
Only smc_buf_get_slot() use down_read() to allow smc_buf_get_slot()
run concurrently, other part use down_write() to keep exclusive
semantics.

Signed-off-by: D. Wythe <alibuda@linux.alibaba.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Stable-dep-of: 833bac7ec3 ("net/smc: Fix setsockopt and sysctl to specify same buffer size again")
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

This commit is contained in:

D. Wythe 2023-02-02 16:26:42 +08:00 • committed by Greg Kroah-Hartman

parent 0fc3c55a3a

commit 206381cee9

3 changed files with 38 additions and 37 deletions

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55

net/smc/smc_core.c

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4

net/smc/smc_core.h

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16

net/smc/smc_llc.c

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