From: Avri Altman <Avri.Altman@wdc.com>
To: Bean Huo <huobean@gmail.com>, Can Guo <cang@codeaurora.org>,
"asutoshd@codeaurora.org" <asutoshd@codeaurora.org>,
"nguyenb@codeaurora.org" <nguyenb@codeaurora.org>,
"hongwus@codeaurora.org" <hongwus@codeaurora.org>,
"ziqichen@codeaurora.org" <ziqichen@codeaurora.org>,
"rnayak@codeaurora.org" <rnayak@codeaurora.org>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>,
"kernel-team@android.com" <kernel-team@android.com>,
"saravanak@google.com" <saravanak@google.com>,
"salyzyn@google.com" <salyzyn@google.com>
Cc: Alim Akhtar <alim.akhtar@samsung.com>,
"James E.J. Bottomley" <jejb@linux.ibm.com>,
"Martin K. Petersen" <martin.petersen@oracle.com>,
Stanley Chu <stanley.chu@mediatek.com>,
Bean Huo <beanhuo@micron.com>,
Nitin Rawat <nitirawa@codeaurora.org>,
Adrian Hunter <adrian.hunter@intel.com>,
Bart Van Assche <bvanassche@acm.org>,
Satya Tangirala <satyat@google.com>,
open list <linux-kernel@vger.kernel.org>
Subject: RE: [PATCH 2/2] scsi: ufs: Protect PM ops and err_handler from user access through sysfs
Date: Tue, 12 Jan 2021 08:20:11 +0000 [thread overview]
Message-ID: <DM6PR04MB6575AC5B5FE4C306F6674194FCAA0@DM6PR04MB6575.namprd04.prod.outlook.com> (raw)
In-Reply-To: <0ad818b10110c4c383afbc2c39235a4f7f17f4c7.camel@gmail.com>
>
> On Sat, 2021-01-02 at 05:59 -0800, Can Guo wrote:
> > + * @shutting_down: flag to check if shutdown has been invoked
> > + * @host_sem: semaphore used to serialize concurrent contexts
> > * @eh_wq: Workqueue that eh_work works on
> > * @eh_work: Worker to handle UFS errors that require s/w attention
> > * @eeh_work: Worker to handle exception events
> > @@ -751,7 +753,8 @@ struct ufs_hba {
> > u32 intr_mask;
> > u16 ee_ctrl_mask;
> > bool is_powered;
> > - struct semaphore eh_sem;
> > + bool shutting_down;
> > + struct semaphore host_sem;
> >
> > /* Work Queues */
> > struct workqueue_struct *eh_wq;
> > @@ -875,6 +878,11 @@ static inline bool ufshcd_is_wb_allowed(struct
> > ufs_hba *hba)
> > return hba->caps & UFSHCD_CAP_WB_EN;
> > }
> >
> > +static inline bool ufshcd_is_sysfs_allowed(struct ufs_hba *hba)
> > +{
> > + return !hba->shutting_down;
> > +}
> > +
>
>
> Can,
>
> Instead adding new shutting_down flag, can we use availible variable
> system_state?
>
Like Can, I am too, don't think that using system state here, e.g. UFS_SHUTDOWN_PM suffices.
The use of the new flag, jointly with the semaphore, provides a tighter control.
Acked-by: Avri Altman <avri.altman@wdc.com>
next prev parent reply other threads:[~2021-01-12 8:21 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1609595975-12219-1-git-send-email-cang@codeaurora.org>
2021-01-02 13:59 ` [PATCH 1/2] scsi: ufs: Fix a possible NULL pointer issue Can Guo
2021-01-12 6:35 ` Stanley Chu
2021-01-12 6:52 ` Can Guo
2021-01-12 9:17 ` Stanley Chu
2021-01-02 13:59 ` [PATCH 2/2] scsi: ufs: Protect PM ops and err_handler from user access through sysfs Can Guo
2021-01-04 20:05 ` Bean Huo
2021-01-05 1:07 ` Can Guo
2021-01-05 18:38 ` Bean Huo
2021-01-06 1:20 ` Can Guo
2021-01-08 11:29 ` Bean Huo
2021-01-08 13:11 ` Stanley Chu
2021-01-09 4:45 ` Can Guo
2021-01-09 4:51 ` Can Guo
2021-01-10 16:13 ` Bean Huo
2021-01-11 1:27 ` Can Guo
2021-01-11 8:23 ` Bean Huo
2021-01-11 9:22 ` Can Guo
2021-01-11 10:04 ` Bean Huo
2021-01-12 0:45 ` Can Guo
2021-01-12 11:32 ` Bean Huo
2021-01-11 1:52 ` Can Guo
2021-01-10 16:18 ` Bean Huo
2021-01-11 1:30 ` Can Guo
2021-01-11 8:25 ` Bean Huo
2021-01-12 8:20 ` Avri Altman [this message]
2021-01-12 9:36 ` Stanley Chu
[not found] <1609388736-22525-1-git-send-email-cang@codeaurora.org>
2020-12-31 4:25 ` Can Guo
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