linux-kernel - [PATCH v3 1/2] ufs: make __ufshcd_send_uic_cmd not wrapped by host

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Message-Id: <bec84ee1ce8f5c5971b98d8e501aeabb9b5b26d1.1686716811.git.kwmad.kim@samsung.com>
Date:   Wed, 14 Jun 2023 13:31:55 +0900
From:   Kiwoong Kim <kwmad.kim@...sung.com>
To:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        alim.akhtar@...sung.com, avri.altman@....com, bvanassche@....org,
        jejb@...ux.ibm.com, martin.petersen@...cle.com, beanhuo@...ron.com,
        adrian.hunter@...el.com, sc.suh@...sung.com, hy50.seo@...sung.com,
        sh425.lee@...sung.com, kwangwon.min@...sung.com,
        junwoo80.lee@...sung.com, wkon.kim@...sung.com
Cc:     Kiwoong Kim <kwmad.kim@...sung.com>
Subject: [PATCH v3 1/2] ufs: make __ufshcd_send_uic_cmd not wrapped by
 host_lock

__ufshcd_send_uic_cmd is wrapped uic_cmd_mutex and
its related contexts are accessed within the period wrappted
by uic_cmd_mutex. Thus, wrapping with host_lock is
redundant.

Signed-off-by: Kiwoong Kim <kwmad.kim@...sung.com>
Reviewed-by: Bart Van Assche <bvanassche@....org>
---
 drivers/ufs/core/ufshcd.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c
index 9434328..a89d39a 100644
--- a/drivers/ufs/core/ufshcd.c
+++ b/drivers/ufs/core/ufshcd.c
@@ -2457,7 +2457,6 @@ __ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd,
 		      bool completion)
 {
 	lockdep_assert_held(&hba->uic_cmd_mutex);
-	lockdep_assert_held(hba->host->host_lock);
 
 	if (!ufshcd_ready_for_uic_cmd(hba)) {
 		dev_err(hba->dev,
@@ -2484,7 +2483,6 @@ __ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd,
 int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
 {
 	int ret;
-	unsigned long flags;
 
 	if (hba->quirks & UFSHCD_QUIRK_BROKEN_UIC_CMD)
 		return 0;
@@ -2493,9 +2491,7 @@ int ufshcd_send_uic_cmd(struct ufs_hba *hba, struct uic_command *uic_cmd)
 	mutex_lock(&hba->uic_cmd_mutex);
 	ufshcd_add_delay_before_dme_cmd(hba);
 
-	spin_lock_irqsave(hba->host->host_lock, flags);
 	ret = __ufshcd_send_uic_cmd(hba, uic_cmd, true);
-	spin_unlock_irqrestore(hba->host->host_lock, flags);
 	if (!ret)
 		ret = ufshcd_wait_for_uic_cmd(hba, uic_cmd);
 
@@ -4180,8 +4176,8 @@ static int ufshcd_uic_pwr_ctrl(struct ufs_hba *hba, struct uic_command *cmd)
 		wmb();
 		reenable_intr = true;
 	}
-	ret = __ufshcd_send_uic_cmd(hba, cmd, false);
 	spin_unlock_irqrestore(hba->host->host_lock, flags);
+	ret = __ufshcd_send_uic_cmd(hba, cmd, false);
 	if (ret) {
 		dev_err(hba->dev,
 			"pwr ctrl cmd 0x%x with mode 0x%x uic error %d\n",
-- 
2.7.4