From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id BD00D166F0C for ; Wed, 13 Aug 2025 14:38:03 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755095883; cv=none; b=lpoQCW+ChiHGKCnnST6Znehxr2brUPG1NytXFjZ1+UcXLbi77UAIn+YSrCukWbhlLExlfTHx2KNEOwUhKg+9sRA0LVqgjs8FR2Yit21dlXVFDYp7X4HnxdkwGKy4GLTgkO8OQ5qz3zgSf6ErlpRqtlVdLxo4CVQNp3+J50UNKwM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755095883; c=relaxed/simple; bh=FjloqKdggHKatAv2F21hK2/DVkBVuqjEt1atV9qsGn4=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=m0r7gMfzXl3MFegTvjOCAUY76kA3x9q8OpQPVnyV71qKSChkprcYcRr6d0ezwlQ8dLcimklY/vXcYi1C6ds252+6wQzwn2hPoBfJqVdnKKfFiJoiuWKVjdPG5RC53UsE5k+NJoCOzgQ4Kykhmyi8RER0qje8rRk/RQ+teyZ5HzQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=isS8OVK/; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="isS8OVK/" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 18EFDC4CEEB; Wed, 13 Aug 2025 14:38:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755095883; bh=FjloqKdggHKatAv2F21hK2/DVkBVuqjEt1atV9qsGn4=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=isS8OVK/FU642hdnvYCxFlVfjd7z5vWnherTQ5p7mjl5NTWBuqFhppYwoznUDZKJA N31hxZ0YgaeiLnKDNRG0JoPjLUmEwUH5ALIvFy3l64lBu8CpLuB5zSCqetzPkYg7nG flU1FlfSTgHdKYgaXKEpRW8fdeI3pOnxJtVMuXJKSuRhjLwk85sUKp+tz7UAblRmGq IVi/llp7Wian1WoHZDU9BwyX6r81cPvNpwDalLZXn7IKZdlDZcBAiRpISgnn9nLDcI 7wPV0FYzUxwQE2mLMFbwZQ4IgYnh0CPuT9whI6o0hzjyN+58UGP3o9LSDz+OaG4FAI VIb3GBs3znu7w== Date: Wed, 13 Aug 2025 07:38:02 -0700 From: Jakub Kicinski To: Sasha Levin Cc: stable@vger.kernel.org, John Ernberg Subject: Re: [PATCH 5.4.y] net: usbnet: Avoid potential RCU stall on LINK_CHANGE event Message-ID: <20250813073802.3f28d69c@kernel.org> In-Reply-To: <20250813134932.2037778-1-sashal@kernel.org> References: <2025081259-headset-swinger-4805@gregkh> <20250813134932.2037778-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Wed, 13 Aug 2025 09:49:32 -0400 Sasha Levin wrote: > From: John Ernberg > > [ Upstream commit 0d9cfc9b8cb17dbc29a98792d36ec39a1cf1395f ] > > The Gemalto Cinterion PLS83-W modem (cdc_ether) is emitting confusing link > up and down events when the WWAN interface is activated on the modem-side. > > Interrupt URBs will in consecutive polls grab: > * Link Connected > * Link Disconnected > * Link Connected Be sure to pull in 8466d393700f9cc into the same release. This change broke Linus's laptop.