linux-kernel - [PATCH 5.14 092/432] scsi: ufs: Use DECLARE_COMPLETION

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Message-Id: <20210916155813.896454635@linuxfoundation.org>
Date:   Thu, 16 Sep 2021 17:57:21 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Adrian Hunter <adrian.hunter@...el.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Can Guo <cang@...eaurora.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Avri Altman <avri.altman@....com>,
        Bean Huo <beanhuo@...ron.com>,
        Daejun Park <daejun7.park@...sung.com>,
        Bart Van Assche <bvanassche@....org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.14 092/432] scsi: ufs: Use DECLARE_COMPLETION_ONSTACK() where appropriate

From: Bart Van Assche <bvanassche@....org>

[ Upstream commit 8a686f26eaa4b8a5c494b6b69e8a97815e3ffb82 ]

>>From Documentation/scheduler/completion.rst: "When a completion is declared
as a local variable within a function, then the initialization should
always use DECLARE_COMPLETION_ONSTACK() explicitly, not just to make
lockdep happy, but also to make it clear that limited scope had been
considered and is intentional."

Link: https://lore.kernel.org/r/20210722033439.26550-6-bvanassche@acm.org
Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Stanley Chu <stanley.chu@...iatek.com>
Cc: Can Guo <cang@...eaurora.org>
Cc: Asutosh Das <asutoshd@...eaurora.org>
Cc: Avri Altman <avri.altman@....com>
Reviewed-by: Avri Altman <avri.altman@....com>
Reviewed-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Daejun Park <daejun7.park@...sung.com>
Signed-off-by: Bart Van Assche <bvanassche@....org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/scsi/ufs/ufshcd.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 179227180961..0fe559ddc789 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -2949,11 +2949,11 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 		enum dev_cmd_type cmd_type, int timeout)
 {
 	struct request_queue *q = hba->cmd_queue;
+	DECLARE_COMPLETION_ONSTACK(wait);
 	struct request *req;
 	struct ufshcd_lrb *lrbp;
 	int err;
 	int tag;
-	struct completion wait;
 
 	down_read(&hba->clk_scaling_lock);
 
@@ -2978,7 +2978,6 @@ static int ufshcd_exec_dev_cmd(struct ufs_hba *hba,
 		goto out;
 	}
 
-	init_completion(&wait);
 	lrbp = &hba->lrb[tag];
 	WARN_ON(lrbp->cmd);
 	err = ufshcd_compose_dev_cmd(hba, lrbp, cmd_type, tag);
@@ -3985,14 +3984,13 @@ EXPORT_SYMBOL_GPL(ufshcd_dme_get_attr);
  */
 static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
 {
-	struct completion uic_async_done;
+	DECLARE_COMPLETION_ONSTACK(uic_async_done);
 	unsigned long flags;
 	u8 status;
 	int ret;
 	bool reenable_intr = false;
 
 	mutex_lock(&hba->uic_cmd_mutex);
-	init_completion(&uic_async_done);
 	ufshcd_add_delay_before_dme_cmd(hba);
 
 	spin_lock_irqsave(hba->host->host_lock, flags);
@@ -6665,11 +6663,11 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 					enum query_opcode desc_op)
 {
 	struct request_queue *q = hba->cmd_queue;
+	DECLARE_COMPLETION_ONSTACK(wait);
 	struct request *req;
 	struct ufshcd_lrb *lrbp;
 	int err = 0;
 	int tag;
-	struct completion wait;
 	u8 upiu_flags;
 
 	down_read(&hba->clk_scaling_lock);
@@ -6687,7 +6685,6 @@ static int ufshcd_issue_devman_upiu_cmd(struct ufs_hba *hba,
 		goto out;
 	}
 
-	init_completion(&wait);
 	lrbp = &hba->lrb[tag];
 	WARN_ON(lrbp->cmd);
 	lrbp->cmd = NULL;
-- 
2.30.2