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 A50372192F2; Tue, 8 Apr 2025 11:41:14 +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=1744112474; cv=none; b=jmJGN0Yhu3yoDuuZB53StYeoWxpL/IXJCW8TekItJDZkqrHVgaI13gatrJ625GLWj4954wbuE25NOHhJH+F7998M7X+7ex3H4WrXVhu/LjohLmwRcqpiVuY+s5IzID5hmrElTmb1q7C0F4AQzjxnjVNZReITRDKARkGrm8I9C2E= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744112474; c=relaxed/simple; bh=7gR7IyVC3KKt2Ensv7xiB5iTBpq5RzOHtMhb3Tvy/Vc=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=YOHH/aXL0tf/yqd+Fc8dv9IjK4FS3XIuqGh1kZ6VJO1rWtzIReklmq3AKHNSNONt0luyf9tApoLFFXZ+sTSJLVGpd/ufSjYqFjQq9Lm0BXbNpf7Z3wzQrIDNK9HzSNaleAAtF0SsT57B/iBENnLHyvRJDk9YXBdg8LCZmIlM56w= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=Tcfcfc7o; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="Tcfcfc7o" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 370C1C4CEE5; Tue, 8 Apr 2025 11:41:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1744112474; bh=7gR7IyVC3KKt2Ensv7xiB5iTBpq5RzOHtMhb3Tvy/Vc=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Tcfcfc7oygcnwT3wGXxueK+pB6+3F11ShptFWsLNxN5eZ3HBichQeIuT3ZFdwFg4e 6b27F/6vAeRjvQVEjk5fN9ONJAdGceii/iYsivJUSXEaKjz6xzS3Tz/Oi1whdf+ozf FNpg3bfjo0cYg4z8qXtAo9w7szP6wyH1zqZzRFu8= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Ruozhu Li , Sagi Grimberg , Keith Busch , Sasha Levin Subject: [PATCH 5.15 042/279] nvmet-rdma: recheck queue state is LIVE in state lock in recv done Date: Tue, 8 Apr 2025 12:47:05 +0200 Message-ID: <20250408104827.516490546@linuxfoundation.org> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250408104826.319283234@linuxfoundation.org> References: <20250408104826.319283234@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Ruozhu Li [ Upstream commit 3988ac1c67e6e84d2feb987d7b36d5791174b3da ] The queue state checking in nvmet_rdma_recv_done is not in queue state lock.Queue state can transfer to LIVE in cm establish handler between state checking and state lock here, cause a silent drop of nvme connect cmd. Recheck queue state whether in LIVE state in state lock to prevent this issue. Signed-off-by: Ruozhu Li Reviewed-by: Sagi Grimberg Signed-off-by: Keith Busch Signed-off-by: Sasha Levin --- drivers/nvme/target/rdma.c | 33 +++++++++++++++++++++++---------- 1 file changed, 23 insertions(+), 10 deletions(-) diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c index 9561ba3d43138..3b4b2d134cf81 100644 --- a/drivers/nvme/target/rdma.c +++ b/drivers/nvme/target/rdma.c @@ -996,6 +996,27 @@ static void nvmet_rdma_handle_command(struct nvmet_rdma_queue *queue, nvmet_req_complete(&cmd->req, status); } +static bool nvmet_rdma_recv_not_live(struct nvmet_rdma_queue *queue, + struct nvmet_rdma_rsp *rsp) +{ + unsigned long flags; + bool ret = true; + + spin_lock_irqsave(&queue->state_lock, flags); + /* + * recheck queue state is not live to prevent a race condition + * with RDMA_CM_EVENT_ESTABLISHED handler. + */ + if (queue->state == NVMET_RDMA_Q_LIVE) + ret = false; + else if (queue->state == NVMET_RDMA_Q_CONNECTING) + list_add_tail(&rsp->wait_list, &queue->rsp_wait_list); + else + nvmet_rdma_put_rsp(rsp); + spin_unlock_irqrestore(&queue->state_lock, flags); + return ret; +} + static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) { struct nvmet_rdma_cmd *cmd = @@ -1037,17 +1058,9 @@ static void nvmet_rdma_recv_done(struct ib_cq *cq, struct ib_wc *wc) rsp->req.port = queue->port; rsp->n_rdma = 0; - if (unlikely(queue->state != NVMET_RDMA_Q_LIVE)) { - unsigned long flags; - - spin_lock_irqsave(&queue->state_lock, flags); - if (queue->state == NVMET_RDMA_Q_CONNECTING) - list_add_tail(&rsp->wait_list, &queue->rsp_wait_list); - else - nvmet_rdma_put_rsp(rsp); - spin_unlock_irqrestore(&queue->state_lock, flags); + if (unlikely(queue->state != NVMET_RDMA_Q_LIVE) && + nvmet_rdma_recv_not_live(queue, rsp)) return; - } nvmet_rdma_handle_command(queue, rsp); } -- 2.39.5