linux-kernel - [PATCH RFC] scsi: ufs: Disable blk-mq for now

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Message-Id: <20180913112848.7807-1-adrian.hunter@intel.com>
Date:   Thu, 13 Sep 2018 14:28:48 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        "James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>
Cc:     Jens Axboe <axboe@...nel.dk>, Christoph Hellwig <hch@....de>,
        Ming Lei <ming.lei@...hat.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Bart Van Assche <Bart.VanAssche@....com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Stanislav Nijnikov <stanislav.nijnikov@....com>,
        Evan Green <evgreen@...omium.org>,
        Vinayak Holikatti <vinholikatti@...il.com>,
        Janek Kotas <jank@...ence.com>,
        Vivek Gautam <vivek.gautam@...eaurora.org>,
        Asutosh Das <asutoshd@...eaurora.org>,
        Subhash Jadavani <subhashj@...eaurora.org>,
        Sayali Lokhande <sayalil@...eaurora.org>,
        Li Wei <liwei213@...wei.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Jaegeuk Kim <jaegeuk@...nel.org>,
        Alim Akhtar <alim.akhtar@...sung.com>,
        Alex Lemberg <Alex.Lemberg@...disk.com>
Subject: [PATCH RFC] scsi: ufs: Disable blk-mq for now

blk-mq does not support runtime pm, so disable blk-mq support for now.

Fixes: d5038a13eca7 ("scsi: core: switch to scsi-mq by default")
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
---
 drivers/scsi/ufs/ufshcd.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/scsi/ufs/ufshcd.c b/drivers/scsi/ufs/ufshcd.c
index 40548bae8efa..a4d36497a047 100644
--- a/drivers/scsi/ufs/ufshcd.c
+++ b/drivers/scsi/ufs/ufshcd.c
@@ -7975,6 +7975,13 @@ int ufshcd_alloc_host(struct device *dev, struct ufs_hba **hba_handle)
 		err = -ENOMEM;
 		goto out_error;
 	}
+
+	/*
+	 * Do not use blk-mq at this time because blk-mq does not support
+	 * runtime pm.
+	 */
+	host->use_blk_mq = false;
+
 	hba = shost_priv(host);
 	hba->host = host;
 	hba->dev = dev;
-- 
2.17.1