linux-kernel - [PATCH v2 3/3] scsi: ufs: Remove redundant checks of !hba in suspend/resume callbacks

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Date:   Tue, 23 Feb 2021 21:36:49 -0800
From:   Can Guo <cang@...eaurora.org>
To:     asutoshd@...eaurora.org, nguyenb@...eaurora.org,
        hongwus@...eaurora.org, linux-scsi@...r.kernel.org,
        kernel-team@...roid.com, cang@...eaurora.org
Cc:     Alim Akhtar <alim.akhtar@...sung.com>,
        Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        Stanley Chu <stanley.chu@...iatek.com>,
        Bean Huo <beanhuo@...ron.com>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        linux-kernel@...r.kernel.org (open list)
Subject: [PATCH v2 3/3] scsi: ufs: Remove redundant checks of !hba in suspend/resume callbacks

Runtime and system suspend/resume can only come after hba probe invokes
platform_set_drvdata(pdev, hba), meaning hba cannot be NULL in these PM
callbacks, so remove the checks of !hba.

Signed-off-by: Can Guo <cang@...eaurora.org>
---
 drivers/scsi/ufs/ufshcd.c | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 013eb73..2517ef1 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -95,8 +95,6 @@
 		       16, 4, buf, __len, false);                        \
 } while (0)
 
-static bool early_suspend;
-
 int ufshcd_dump_regs(struct ufs_hba *hba, size_t offset, size_t len,
 		     const char *prefix)
 {
@@ -8978,11 +8976,6 @@ int ufshcd_system_suspend(struct ufs_hba *hba)
 	int ret = 0;
 	ktime_t start = ktime_get();
 
-	if (!hba) {
-		early_suspend = true;
-		return 0;
-	}
-
 	down(&hba->host_sem);
 
 	if (!hba->is_powered)
@@ -9034,14 +9027,6 @@ int ufshcd_system_resume(struct ufs_hba *hba)
 	int ret = 0;
 	ktime_t start = ktime_get();
 
-	if (!hba)
-		return -EINVAL;
-
-	if (unlikely(early_suspend)) {
-		early_suspend = false;
-		down(&hba->host_sem);
-	}
-
 	if (!hba->is_powered || pm_runtime_suspended(hba->dev))
 		/*
 		 * Let the runtime resume take care of resuming
@@ -9074,9 +9059,6 @@ int ufshcd_runtime_suspend(struct ufs_hba *hba)
 	int ret = 0;
 	ktime_t start = ktime_get();
 
-	if (!hba)
-		return -EINVAL;
-
 	if (!hba->is_powered)
 		goto out;
 	else
@@ -9115,9 +9097,6 @@ int ufshcd_runtime_resume(struct ufs_hba *hba)
 	int ret = 0;
 	ktime_t start = ktime_get();
 
-	if (!hba)
-		return -EINVAL;
-
 	if (!hba->is_powered)
 		goto out;
 	else
-- 
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