From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Greg KH <gregkh@linuxfoundation.org>
Cc: arnd@arndb.de, smohanad@codeaurora.org, jhugo@codeaurora.org,
kvalo@codeaurora.org, bjorn.andersson@linaro.org,
hemantk@codeaurora.org, linux-arm-msm@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 02/16] bus: mhi: core: Add support for registering MHI controllers
Date: Thu, 13 Feb 2020 20:52:55 +0530 [thread overview]
Message-ID: <20200213152255.GC15010@mani> (raw)
In-Reply-To: <20200211192236.GB1962867@kroah.com>
Hi Greg,
On Tue, Feb 11, 2020 at 11:22:36AM -0800, Greg KH wrote:
> On Wed, Feb 12, 2020 at 12:41:47AM +0530, Manivannan Sadhasivam wrote:
> > Hi Greg,
> >
> > On Thu, Feb 06, 2020 at 05:56:06PM +0100, Greg KH wrote:
> > > On Fri, Jan 31, 2020 at 07:19:55PM +0530, Manivannan Sadhasivam wrote:
> > > > +static void mhi_release_device(struct device *dev)
> > > > +{
> > > > + struct mhi_device *mhi_dev = to_mhi_device(dev);
> > > > +
> > > > + if (mhi_dev->ul_chan)
> > > > + mhi_dev->ul_chan->mhi_dev = NULL;
> > >
> > > That looks really odd. Why didn't you just drop the reference you
> > > should have grabbed here for this pointer? You did properly increment
> > > it when you saved it, right? :)
> > >
> >
> > Well, there is no reference count (kref) exist for mhi_dev.
>
> Then something is wrong with your model :(
>
> You can't save pointers off to things without reference counting, that
> is going to cause you real problems. See the coding style document for
> all the details.
>
> > And we really needed to NULL the mhi_dev to avoid any dangling
> > reference to it.
>
> Again, that's not how to do this correctly.
>
> > The reason for not having kref is that, each mhi_dev will be used by
> > maximum of 2 channels only. So thought that refcounting is not needed.
> > Please correct me if I'm wrong.
>
> Please read section 11 of Documentation/process/coding-style.rst
>
I have fixed it and will send the next iteration soon.
Thanks,
Mani
> thanks,
>
> greg k-h
next prev parent reply other threads:[~2020-02-13 15:23 UTC|newest]
Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-31 13:49 [PATCH v2 00/16] Add MHI bus support Manivannan Sadhasivam
2020-01-31 13:49 ` [PATCH v2 01/16] docs: Add documentation for MHI bus Manivannan Sadhasivam
2020-01-31 22:57 ` Jeffrey Hugo
2020-01-31 13:49 ` [PATCH v2 02/16] bus: mhi: core: Add support for registering MHI controllers Manivannan Sadhasivam
2020-02-06 16:56 ` Greg KH
2020-02-11 19:11 ` Manivannan Sadhasivam
2020-02-11 19:22 ` Greg KH
2020-02-13 15:22 ` Manivannan Sadhasivam [this message]
2020-02-06 16:57 ` Greg KH
2020-02-11 18:41 ` Manivannan Sadhasivam
2020-02-11 19:20 ` Greg KH
2020-02-13 15:20 ` Manivannan Sadhasivam
2020-02-13 15:34 ` Greg KH
2020-02-13 15:48 ` Manivannan Sadhasivam
2020-02-13 15:53 ` Greg KH
2020-02-14 16:41 ` Jeffrey Hugo
2020-02-17 5:27 ` Manivannan Sadhasivam
2020-02-17 11:45 ` Greg KH
2020-02-17 11:53 ` Manivannan Sadhasivam
2020-02-17 11:59 ` Greg KH
2020-02-17 13:04 ` Manivannan Sadhasivam
2020-02-17 14:15 ` Greg KH
2020-02-17 16:04 ` Arnd Bergmann
2020-02-17 16:32 ` Greg KH
2020-02-17 17:50 ` Manivannan Sadhasivam
2020-02-06 17:08 ` Jeffrey Hugo
2020-01-31 13:49 ` [PATCH v2 03/16] bus: mhi: core: Add support for registering MHI client drivers Manivannan Sadhasivam
2020-01-31 23:00 ` Jeffrey Hugo
2020-01-31 13:49 ` [PATCH v2 04/16] bus: mhi: core: Add support for creating and destroying MHI devices Manivannan Sadhasivam
2020-02-06 16:16 ` Jeffrey Hugo
2020-01-31 13:49 ` [PATCH v2 05/16] bus: mhi: core: Add support for ringing channel/event ring doorbells Manivannan Sadhasivam
2020-02-06 20:14 ` Jeffrey Hugo
2020-01-31 13:49 ` [PATCH v2 06/16] bus: mhi: core: Add support for PM state transitions Manivannan Sadhasivam
2020-02-06 20:15 ` Jeffrey Hugo
2020-01-31 13:50 ` [PATCH v2 07/16] bus: mhi: core: Add support for basic PM operations Manivannan Sadhasivam
2020-02-06 20:15 ` Jeffrey Hugo
2020-01-31 13:50 ` [PATCH v2 08/16] bus: mhi: core: Add support for downloading firmware over BHIe Manivannan Sadhasivam
2020-02-06 20:15 ` Jeffrey Hugo
2020-01-31 13:50 ` [PATCH v2 09/16] bus: mhi: core: Add support for downloading RDDM image during panic Manivannan Sadhasivam
2020-02-06 16:41 ` Jeffrey Hugo
2020-02-06 20:17 ` Jeffrey Hugo
2020-01-31 13:50 ` [PATCH v2 10/16] bus: mhi: core: Add support for processing events from client device Manivannan Sadhasivam
2020-02-06 20:16 ` Jeffrey Hugo
2020-01-31 13:50 ` [PATCH v2 11/16] bus: mhi: core: Add support for data transfer Manivannan Sadhasivam
2020-02-06 20:16 ` Jeffrey Hugo
2020-02-17 16:13 ` Arnd Bergmann
2020-02-17 16:47 ` Manivannan Sadhasivam
2020-02-18 5:51 ` Manivannan Sadhasivam
2020-02-18 14:34 ` Arnd Bergmann
2020-01-31 13:50 ` [PATCH v2 12/16] bus: mhi: core: Add uevent support for module autoloading Manivannan Sadhasivam
2020-02-06 20:16 ` Jeffrey Hugo
2020-01-31 13:50 ` [PATCH v2 13/16] MAINTAINERS: Add entry for MHI bus Manivannan Sadhasivam
2020-02-03 10:16 ` Andy Shevchenko
2020-02-04 7:05 ` Manivannan Sadhasivam
2020-01-31 13:50 ` [PATCH v2 14/16] net: qrtr: Add MHI transport layer Manivannan Sadhasivam
2020-02-03 18:12 ` Jakub Kicinski
2020-02-04 8:19 ` Manivannan Sadhasivam
2020-02-07 0:14 ` Chris Lew
2020-02-11 3:50 ` Manivannan Sadhasivam
2020-02-12 1:01 ` Chris Lew
2020-01-31 13:50 ` [PATCH v2 15/16] net: qrtr: Do not depend on ARCH_QCOM Manivannan Sadhasivam
2020-01-31 13:50 ` [PATCH v2 16/16] soc: qcom: Do not depend on ARCH_QCOM for QMI helpers Manivannan Sadhasivam
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