From: Christoph Hellwig <hch@lst.de>
To: Bart Van Assche <bart.vanassche@sandisk.com>
Cc: "Martin K . Petersen" <martin.petersen@oracle.com>,
James Bottomley <James.Bottomley@HansenPartnership.com>,
linux-scsi@vger.kernel.org, Christoph Hellwig <hch@lst.de>,
Hannes Reinecke <hare@suse.com>,
Johannes Thumshirn <jthumshirn@suse.de>
Subject: Re: [PATCH v3 04/12] Protect SCSI device state changes with a mutex
Date: Mon, 5 Jun 2017 10:09:37 +0200 [thread overview]
Message-ID: <20170605080937.GB22028@lst.de> (raw)
In-Reply-To: <20170602212203.30401-5-bart.vanassche@sandisk.com>
On Fri, Jun 02, 2017 at 02:21:55PM -0700, Bart Van Assche wrote:
> Serializing SCSI device state changes avoids that two state changes
> can occur concurrently, e.g. the state changes in scsi_target_block()
> and __scsi_remove_device(). This serialization is essential to make
> patch "Make __scsi_remove_device go straight from BLOCKED to DEL"
> work reliably.
>
> Enable this mechanism for all scsi_target_*block() callers but not
> for the scsi_internal_device_unblock() calls from the mpt3sas driver
> because that driver can call scsi_internal_device_unblock() from
> atomic context.
And not taking the lock in that path is safe because of what conditions?
next prev parent reply other threads:[~2017-06-05 8:09 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-02 21:21 [PATCH v3 00/12] SCSI patches for kernel v4.13 Bart Van Assche
2017-06-02 21:21 ` [PATCH v3 01/12] Avoid that scsi_exit_rq() triggers a use-after-free Bart Van Assche
2017-06-02 21:21 ` [PATCH v3 02/12] Split scsi_internal_device_block() Bart Van Assche
2017-06-02 21:21 ` [PATCH v3 03/12] Create two versions of scsi_internal_device_unblock() Bart Van Assche
2017-06-02 21:21 ` [PATCH v3 04/12] Protect SCSI device state changes with a mutex Bart Van Assche
2017-06-05 8:09 ` Christoph Hellwig [this message]
2017-06-05 15:18 ` Bart Van Assche
2017-06-05 18:36 ` Bart Van Assche
2017-06-08 15:53 ` hch
2017-06-02 21:21 ` [PATCH v3 05/12] Introduce scsi_start_queue() Bart Van Assche
2017-06-02 21:21 ` [PATCH v3 06/12] Make __scsi_remove_device go straight from BLOCKED to DEL Bart Van Assche
2017-06-02 21:21 ` [PATCH v3 07/12] Only add commands to the device command list if required by the LLD Bart Van Assche
2017-06-02 21:21 ` [PATCH v3 08/12] Introduce scsi_mq_sgl_size() Bart Van Assche
2017-06-02 21:22 ` [PATCH v3 09/12] Make scsi_mq_prep_fn() call scsi_init_command() Bart Van Assche
2017-06-05 8:10 ` Christoph Hellwig
2017-06-02 21:22 ` [PATCH v3 10/12] snic: Remove code that zeroes driver-private command data Bart Van Assche
2017-06-02 21:22 ` [PATCH v3 11/12] virtio_scsi: " Bart Van Assche
2017-06-02 21:22 ` [PATCH v3 12/12] xen/scsifront: " Bart Van Assche
2017-06-13 1:04 ` [PATCH v3 00/12] SCSI patches for kernel v4.13 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=20170605080937.GB22028@lst.de \
--to=hch@lst.de \
--cc=James.Bottomley@HansenPartnership.com \
--cc=bart.vanassche@sandisk.com \
--cc=hare@suse.com \
--cc=jthumshirn@suse.de \
--cc=linux-scsi@vger.kernel.org \
--cc=martin.petersen@oracle.com \
/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