From patchwork Thu Mar 7 09:37:31 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Xingui Yang X-Patchwork-Id: 778780 Received: from szxga05-in.huawei.com (szxga05-in.huawei.com [45.249.212.191]) (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 80AD383CDB; Thu, 7 Mar 2024 09:39:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=45.249.212.191 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709804353; cv=none; b=AB80Pgy1c92A7wwIDRk92W4Vrjn1q4lpWdMaOTNq//7J9efu0+Qxwa4oym/fhGETLYz63tzKaQAoSxy/BSwdiZFjlBV+hL/14LvBob/JtOegZAPApVT6vfau7Gy8ERLRjGfSBsH43bFBjdbQV2xhfaNcbdH0rQEdKXMczRuitnQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709804353; c=relaxed/simple; bh=zRQKWwo4ws0uBzmnbQDiBb/B4IeY2WAPFa4HgSvKD6o=; h=From:To:CC:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=DekVFUiMq/SvhbTo7l5Q6/dId0wS0TPV1EjQuNq+RZ18r19QkTZKS0pYp7RkdoNeMhKEzHWFaGap8FS+gw5IqJs8FfKLehETNa0Cm+SBs3unpA28+ef+apXwE4P/5BFeGvomR8aKg/HqD10FYHf72mTp5/IgQ6R51Q3Eizz7ous= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com; spf=pass smtp.mailfrom=huawei.com; arc=none smtp.client-ip=45.249.212.191 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=huawei.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=huawei.com Received: from mail.maildlp.com (unknown [172.19.88.234]) by szxga05-in.huawei.com (SkyGuard) with ESMTP id 4Tr44g21BHz1FM3R; Thu, 7 Mar 2024 17:38:59 +0800 (CST) Received: from dggpemd100001.china.huawei.com (unknown [7.185.36.94]) by mail.maildlp.com (Postfix) with ESMTPS id 6F442140336; Thu, 7 Mar 2024 17:39:08 +0800 (CST) Received: from localhost.localdomain (10.50.165.33) by dggpemd100001.china.huawei.com (7.185.36.94) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.28; Thu, 7 Mar 2024 17:39:08 +0800 From: Xingui Yang To: , , , , CC: , , , , , Subject: [PATCH v3 1/3] scsi: libsas: Allow smp_execute_task() arguments to be on the stack Date: Thu, 7 Mar 2024 09:37:31 +0000 Message-ID: <20240307093733.41222-2-yangxingui@huawei.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20240307093733.41222-1-yangxingui@huawei.com> References: <20240307093733.41222-1-yangxingui@huawei.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ClientProxiedBy: dggems706-chm.china.huawei.com (10.3.19.183) To dggpemd100001.china.huawei.com (7.185.36.94) We need to use alloc_smp_resp() and alloc_smp_req() before call smp_execute_task() as we can't allocate these memories on the stack for calling sg_init_one(). But if we changed smp_execute_task() to memcpy from/to data on the stack, it might make callers simpler. Suggested-by: John Garry Signed-off-by: Xingui Yang --- drivers/scsi/libsas/sas_expander.c | 32 ++++++++++++++++++++---------- 1 file changed, 21 insertions(+), 11 deletions(-) diff --git a/drivers/scsi/libsas/sas_expander.c b/drivers/scsi/libsas/sas_expander.c index a2204674b680..1eeb69cba8da 100644 --- a/drivers/scsi/libsas/sas_expander.c +++ b/drivers/scsi/libsas/sas_expander.c @@ -120,17 +120,6 @@ static int smp_execute_task_sg(struct domain_device *dev, return res; } -static int smp_execute_task(struct domain_device *dev, void *req, int req_size, - void *resp, int resp_size) -{ - struct scatterlist req_sg; - struct scatterlist resp_sg; - - sg_init_one(&req_sg, req, req_size); - sg_init_one(&resp_sg, resp, resp_size); - return smp_execute_task_sg(dev, &req_sg, &resp_sg); -} - /* ---------- Allocations ---------- */ static inline void *alloc_smp_req(int size) @@ -146,6 +135,27 @@ static inline void *alloc_smp_resp(int size) return kzalloc(size, GFP_KERNEL); } +static int smp_execute_task(struct domain_device *dev, void *req, int req_size, + void *resp, int resp_size) +{ + struct scatterlist req_sg; + struct scatterlist resp_sg; + void *_req = kmemdup(req, req_size, GFP_KERNEL); + void *_resp = alloc_smp_resp(resp_size); + int ret; + + if (!_req || !resp) + return -ENOMEM; + + sg_init_one(&req_sg, _req, req_size); + sg_init_one(&resp_sg, _resp, resp_size); + ret = smp_execute_task_sg(dev, &req_sg, &resp_sg); + memcpy(resp, _resp, resp_size); + kfree(_req); + kfree(_resp); + return ret; +} + static char sas_route_char(struct domain_device *dev, struct ex_phy *phy) { switch (phy->routing_attr) {