From: "stern@rowland.harvard.edu" <stern@rowland.harvard.edu>
To: "Sverdlin, Alexander \(Nokia - DE/Ulm\)" <alexander.sverdlin@nokia.com>
Cc: "dinghao.liu@zju.edu.cn" <dinghao.liu@zju.edu.cn>,
"kjlu@umn.edu" <kjlu@umn.edu>,
"mpm@selenic.com" <mpm@selenic.com>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"herbert@gondor.apana.org.au" <herbert@gondor.apana.org.au>,
"ben.dooks@codethink.co.uk" <ben.dooks@codethink.co.uk>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"arnd@arndb.de" <arnd@arndb.de>,
"allison@lohutok.net" <allison@lohutok.net>,
"yuehaibing@huawei.com" <yuehaibing@huawei.com>,
"rfontana@redhat.com" <rfontana@redhat.com>,
"linux-crypto@vger.kernel.org" <linux-crypto@vger.kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>
Subject: Re: [PATCH] hwrng: ks-sa - fix runtime pm imbalance on error
Date: Wed, 20 May 2020 12:45:56 -0400 [thread overview]
Message-ID: <20200520164556.GC11084@rowland.harvard.edu> (raw)
In-Reply-To: <ab400cba7523e69b15360b0928cb8fa8b9432d86.camel@nokia.com>
On Wed, May 20, 2020 at 03:42:17PM +0000, Sverdlin, Alexander (Nokia - DE/Ulm) wrote:
> Hello Dinghao,
>
> On Wed, 2020-05-20 at 21:29 +0800, Dinghao Liu wrote:
> > pm_runtime_get_sync() increments the runtime PM usage counter even
> > the call returns an error code. Thus a pairing decrement is needed
> > on the error handling path to keep the counter balanced.
>
> I believe, this is the wrong place for such kind of fix.
> pm_runtime_get_sync() has obviously a broken semantics with regards to
> your observation but no other driver does what you propose.
Look again. For example, see what usb_autoresume_device() in
drivers/usb/core/driver.c does.
You really shouldn't make generalizations such as "no other driver does
..." unless you have read the code for every driver in the kernel.
Alan Stern
next prev parent reply other threads:[~2020-05-20 16:45 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-20 13:29 [PATCH] hwrng: ks-sa - fix runtime pm imbalance on error Dinghao Liu
2020-05-20 15:42 ` Sverdlin, Alexander (Nokia - DE/Ulm)
2020-05-20 16:45 ` stern [this message]
2020-05-28 6:55 ` Herbert Xu
2020-05-28 7:13 ` dinghao.liu
2020-05-28 15:39 ` stern
2020-05-21 6:21 ` dinghao.liu
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=20200520164556.GC11084@rowland.harvard.edu \
--to=stern@rowland.harvard.edu \
--cc=alexander.sverdlin@nokia.com \
--cc=allison@lohutok.net \
--cc=arnd@arndb.de \
--cc=ben.dooks@codethink.co.uk \
--cc=dinghao.liu@zju.edu.cn \
--cc=gregkh@linuxfoundation.org \
--cc=herbert@gondor.apana.org.au \
--cc=kjlu@umn.edu \
--cc=linux-crypto@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mpm@selenic.com \
--cc=rfontana@redhat.com \
--cc=tglx@linutronix.de \
--cc=yuehaibing@huawei.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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.