From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 A46024399E8 for ; Wed, 22 Jul 2026 18:07:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784743674; cv=none; b=NfsENxXpLtk7aBA71bAnA7RHNOxYpTqnu97GZtHEgQMof8l2A9zZ5FS5iiWz1+thlS/6fympemBhO91f9BRedUY35jDFH1jtzAsXYxPlmtap9QU0NYBObmqzhTB3Gsz7gGy7X1Krx6O8OMasyhs0easNGtJe/a80DsM5u20ebB0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784743674; c=relaxed/simple; bh=ixdXprL+p0VvdabQLTPUGij4Gt02WCFGUkoJaVJVa5A=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=MZ0dSkWvax0j4ONCoucDt0pvjAda7hTahbIIVqDpKfCQmTUrBD1Drq3A11AWq/AxtDZLAnOr5C8zisRswAm4gBjf9bU4s6UKL16hS/xf5rGQw+1X7U/6DNnR6AkkpFL8QJ0wclCcbPuwry/TXLOsa1U9EIMVo4KbOKvS9qKsDLc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=nTXPKvI7; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="nTXPKvI7" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9E8701F00A3E; Wed, 22 Jul 2026 18:07:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1784743672; bh=eptkDrM+c2594PjZWLTXpUhRQOHatJaiyJt41pLLCFU=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=nTXPKvI7PdGIprsj1nYMo8QZp0qLkxYe5zLrxEKcNJ+DQB34+4wCM6YuE+IVhb/Vq 0SAwML31m6fKV9PXFUCfEH7Z53Jp/bhvn+kl7rd9QaDti9NeNHOaT5u84Bmz/T2IL8 KcpyK0fiPvl/1ZCHhEqRfTwP8+n2BPEBld2pxhDma+gNEhqqPSwU1h3gJoM7LMgIIQ 3NfaFCcF1Gnt7loX9JLCl3yhy5p7zqkVoxCdTNkqc93ttfgslKWMluXD4GFbsG0K/H BAqr5JQ2kPwhmYkx2zoZcdRh/We7OJYvZOQnmVvb8l6FcTj2lU6jxYgKRSqb0pbh1K p1EuYmnkD6M3g== From: Sasha Levin To: stable@vger.kernel.org Cc: Runyu Xiao , Simon Horman , Ratheesh Kannoth , Jakub Kicinski , Sasha Levin Subject: [PATCH 6.12.y 2/2] octeontx2-vf: clear stale mailbox IRQ state before request_irq() Date: Wed, 22 Jul 2026 14:07:48 -0400 Message-ID: <20260722180748.2202109-2-sashal@kernel.org> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260722180748.2202109-1-sashal@kernel.org> References: <2026072022-stupor-recount-8e77@gregkh> <20260722180748.2202109-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit From: Runyu Xiao [ Upstream commit 0b352f04b9be2c83c0240aa6dae7257fefa90464 ] otx2vf_register_mbox_intr() currently installs the VF mailbox IRQ handler before clearing stale mailbox interrupt state. The code then says that local interrupt bits should be cleared first to avoid spurious interrupts, but that clear still happens only after request_irq() has already made the handler reachable. A running system can reach this during VF mailbox interrupt registration while stale or latched RVU_VF_INT state is still present. If delivery happens in the request_irq()-to-clear window, otx2vf_vfaf_mbox_intr_handler() can run before local quiesce and touch the same vf->mbox and vf->mbox_wq carrier that probe and teardown later reuse or destroy. Move the stale mailbox interrupt clear ahead of request_irq(), but keep interrupt enabling after the handler is installed. This closes the pre-clear early-IRQ window without creating a new enable-before-handler window. Fixes: 3184fb5ba96e ("octeontx2-vf: Virtual function driver support") Cc: stable@vger.kernel.org Signed-off-by: Runyu Xiao Reviewed-by: Simon Horman Reviewed-by: Ratheesh Kannoth Link: https://patch.msgid.link/20260611160014.3202224-3-runyu.xiao@seu.edu.cn Signed-off-by: Jakub Kicinski Signed-off-by: Sasha Levin --- .../net/ethernet/marvell/octeontx2/nic/otx2_vf.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c index 99fcc5661674be..e26c830ae1ffc7 100644 --- a/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c +++ b/drivers/net/ethernet/marvell/octeontx2/nic/otx2_vf.c @@ -245,9 +245,15 @@ static int otx2vf_register_mbox_intr(struct otx2_nic *vf, bool probe_pf) { struct otx2_hw *hw = &vf->hw; struct msg_req *req; + u64 mbox_int_mask; char *irq_name; int err; + mbox_int_mask = BIT_ULL(0); + + /* Clear stale mailbox interrupt state before installing the handler. */ + otx2_write64(vf, RVU_VF_INT, mbox_int_mask); + /* Register mailbox interrupt handler */ irq_name = &hw->irq_name[RVU_VF_INT_VEC_MBOX * NAME_SIZE]; snprintf(irq_name, NAME_SIZE, "RVUVFAF Mbox"); @@ -259,11 +265,8 @@ static int otx2vf_register_mbox_intr(struct otx2_nic *vf, bool probe_pf) return err; } - /* Enable mailbox interrupt for msgs coming from PF. - * First clear to avoid spurious interrupts, if any. - */ - otx2_write64(vf, RVU_VF_INT, BIT_ULL(0)); - otx2_write64(vf, RVU_VF_INT_ENA_W1S, BIT_ULL(0)); + /* Enable mailbox interrupt for msgs coming from PF. */ + otx2_write64(vf, RVU_VF_INT_ENA_W1S, mbox_int_mask); if (!probe_pf) return 0; -- 2.53.0