From: Stanley Chu <stanley.chu@mediatek.com>
To: <linux-scsi@vger.kernel.org>, <martin.petersen@oracle.com>,
<avri.altman@wdc.com>, <alim.akhtar@samsung.com>,
<pedrom.sousa@synopsys.com>
Cc: <linux-mediatek@lists.infradead.org>,
<linux-arm-kernel@lists.infradead.org>, <matthias.bgg@gmail.com>,
<evgreen@chromium.org>, <beanhuo@micron.com>,
<marc.w.gonzalez@free.fr>, <ygardi@codeaurora.org>,
<subhashj@codeaurora.org>, <sthumma@codeaurora.org>,
<kuohong.wang@mediatek.com>, <peter.wang@mediatek.com>,
<chun-hung.wu@mediatek.com>, <andy.teng@mediatek.com>,
Stanley Chu <stanley.chu@mediatek.com>, <stable@vger.kernel.org>
Subject: [PATCH v2] scsi: ufs: Avoid runtime suspend possibly being blocked forever
Date: Wed, 12 Jun 2019 23:19:05 +0800 [thread overview]
Message-ID: <1560352745-24681-1-git-send-email-stanley.chu@mediatek.com> (raw)
UFS runtime suspend can be triggered after pm_runtime_enable()
is invoked in ufshcd_pltfrm_init(). However if the first runtime
suspend is triggered before binding ufs_hba structure to ufs
device structure via platform_set_drvdata(), then UFS runtime
suspend will be no longer triggered in the future because its
dev->power.runtime_error was set in the first triggering and does
not have any chance to be cleared.
To be more clear, dev->power.runtime_error is set if hba is NULL
in ufshcd_runtime_suspend() which returns -EINVAL to rpm_callback()
where dev->power.runtime_error is set as -EINVAL. In this case, any
future rpm_suspend() for UFS device fails because
rpm_check_suspend_allowed() fails due to non-zero
dev->power.runtime_error.
To resolve this issue, make sure the first UFS runtime suspend
get valid "hba" in ufshcd_runtime_suspend(): Enable UFS runtime PM
only after hba is successfully bound to UFS device structure.
Fixes: 62694735ca95 ([SCSI] ufs: Add runtime PM support for UFS host controller driver)
Cc: stable@vger.kernel.org
Signed-off-by: Stanley Chu <stanley.chu@mediatek.com>
---
drivers/scsi/ufs/ufshcd-pltfrm.c | 11 ++++-------
1 file changed, 4 insertions(+), 7 deletions(-)
diff --git a/drivers/scsi/ufs/ufshcd-pltfrm.c b/drivers/scsi/ufs/ufshcd-pltfrm.c
index 8a74ec30c3d2..d7d521b394c3 100644
--- a/drivers/scsi/ufs/ufshcd-pltfrm.c
+++ b/drivers/scsi/ufs/ufshcd-pltfrm.c
@@ -430,24 +430,21 @@ int ufshcd_pltfrm_init(struct platform_device *pdev,
goto dealloc_host;
}
- pm_runtime_set_active(&pdev->dev);
- pm_runtime_enable(&pdev->dev);
-
ufshcd_init_lanes_per_dir(hba);
err = ufshcd_init(hba, mmio_base, irq);
if (err) {
dev_err(dev, "Initialization failed\n");
- goto out_disable_rpm;
+ goto dealloc_host;
}
platform_set_drvdata(pdev, hba);
+ pm_runtime_set_active(&pdev->dev);
+ pm_runtime_enable(&pdev->dev);
+
return 0;
-out_disable_rpm:
- pm_runtime_disable(&pdev->dev);
- pm_runtime_set_suspended(&pdev->dev);
dealloc_host:
ufshcd_dealloc_host(hba);
out:
--
2.18.0
next reply other threads:[~2019-06-12 15:19 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-12 15:19 Stanley Chu [this message]
2019-06-13 8:09 ` [PATCH v2] scsi: ufs: Avoid runtime suspend possibly being blocked forever Avri Altman
2019-06-19 2:51 ` Martin K. Petersen
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1560352745-24681-1-git-send-email-stanley.chu@mediatek.com \
--to=stanley.chu@mediatek.com \
--cc=alim.akhtar@samsung.com \
--cc=andy.teng@mediatek.com \
--cc=avri.altman@wdc.com \
--cc=beanhuo@micron.com \
--cc=chun-hung.wu@mediatek.com \
--cc=evgreen@chromium.org \
--cc=kuohong.wang@mediatek.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-mediatek@lists.infradead.org \
--cc=linux-scsi@vger.kernel.org \
--cc=marc.w.gonzalez@free.fr \
--cc=martin.petersen@oracle.com \
--cc=matthias.bgg@gmail.com \
--cc=pedrom.sousa@synopsys.com \
--cc=peter.wang@mediatek.com \
--cc=stable@vger.kernel.org \
--cc=sthumma@codeaurora.org \
--cc=subhashj@codeaurora.org \
--cc=ygardi@codeaurora.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).