linux-kernel - [PATCH 4.14 096/173] scsi: ufs: Recheck bkops level if bkops is disabled

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Message-Id: <20200213151957.157886640@linuxfoundation.org>
Date:   Thu, 13 Feb 2020 07:19:59 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Bean Huo <beanhuo@...ron.com>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Can Guo <cang@...eaurora.org>,
        "Martin K. Petersen" <martin.petersen@...cle.com>
Subject: [PATCH 4.14 096/173] scsi: ufs: Recheck bkops level if bkops is disabled

From: Asutosh Das <asutoshd@...eaurora.org>

commit 24366c2afbb0539fb14eff330d4e3a5db5c0a3ef upstream.

bkops level should be rechecked upon receiving an exception.  Currently the
level is being cached and never updated.

Update bkops each time the level is checked.  Also do not use the cached
bkops level value if it is disabled and then enabled.

Fixes: afdfff59a0e0 (scsi: ufs: handle non spec compliant bkops behaviour by device)
Link: https://lore.kernel.org/r/1574751214-8321-2-git-send-email-cang@qti.qualcomm.com
Reviewed-by: Bean Huo <beanhuo@...ron.com>
Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>
Tested-by: Alim Akhtar <alim.akhtar@...sung.com>
Signed-off-by: Asutosh Das <asutoshd@...eaurora.org>
Signed-off-by: Can Guo <cang@...eaurora.org>
Signed-off-by: Martin K. Petersen <martin.petersen@...cle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/ufs/ufshcd.c |    3 +++
 1 file changed, 3 insertions(+)

--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -4812,6 +4812,7 @@ static int ufshcd_disable_auto_bkops(str

 	hba->auto_bkops_enabled = false;
 	trace_ufshcd_auto_bkops_state(dev_name(hba->dev), "Disabled");
+	hba->is_urgent_bkops_lvl_checked = false;
 out:
 	return err;
 }
@@ -4836,6 +4837,7 @@ static void ufshcd_force_reset_auto_bkop
 		hba->ee_ctrl_mask &= ~MASK_EE_URGENT_BKOPS;
 		ufshcd_disable_auto_bkops(hba);
 	}
+	hba->is_urgent_bkops_lvl_checked = false;
 }

 static inline int ufshcd_get_bkops_status(struct ufs_hba *hba, u32 *status)
@@ -4882,6 +4884,7 @@ static int ufshcd_bkops_ctrl(struct ufs_
 		err = ufshcd_enable_auto_bkops(hba);
 	else
 		err = ufshcd_disable_auto_bkops(hba);
+	hba->urgent_bkops_lvl = curr_status;
 out:
 	return err;
 }