netdev - [PATCH net-next v2 0/6] net: deduplicate netdev name allocation

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Message-ID: <20231023152346.3639749-1-kuba@kernel.org>
Date: Mon, 23 Oct 2023 08:23:40 -0700
From: Jakub Kicinski <kuba@...nel.org>
To: davem@...emloft.net
Cc: netdev@...r.kernel.org,
	edumazet@...gle.com,
	pabeni@...hat.com,
	johannes.berg@...el.com,
	mpe@...erman.id.au,
	j@...fi,
	jiri@...nulli.us
Subject: [PATCH net-next v2 0/6] net: deduplicate netdev name allocation

After recent fixes we have even more duplicated code in netdev name
allocation helpers. There are two complications in this code.
First, __dev_alloc_name() clobbers its output arg even if allocation
fails, forcing callers to do extra copies. Second as our experience in
commit 55a5ec9b7710 ("Revert "net: core: dev_get_valid_name is now the same as dev_alloc_name_ns"") and
commit 029b6d140550 ("Revert "net: core: maybe return -EEXIST in __dev_alloc_name"")
taught us, user space is very sensitive to the exact error codes.

Align the callers of __dev_alloc_name(), and remove some of its
complexity.

v2: extend commit message on patch 4
v1: https://lore.kernel.org/all/20231020011856.3244410-1-kuba@kernel.org/

Jakub Kicinski (6):
  net: don't use input buffer of __dev_alloc_name() as a scratch space
  net: make dev_alloc_name() call dev_prep_valid_name()
  net: reduce indentation of __dev_alloc_name()
  net: trust the bitmap in __dev_alloc_name()
  net: remove dev_valid_name() check from __dev_alloc_name()
  net: remove else after return in dev_prep_valid_name()

 net/core/dev.c | 120 +++++++++++++++++++------------------------------
 1 file changed, 45 insertions(+), 75 deletions(-)

-- 
2.41.0