From: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
To: Alex Elder <elder@linaro.org>
Cc: mhi@lists.linux.dev, quic_hemantk@quicinc.com,
quic_bbhatt@quicinc.com, quic_jhugo@quicinc.com,
vinod.koul@linaro.org, bjorn.andersson@linaro.org,
dmitry.baryshkov@linaro.org, quic_vbadigan@quicinc.com,
quic_cang@quicinc.com, quic_skananth@quicinc.com,
linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 10/25] bus: mhi: ep: Add support for creating and destroying MHI EP devices
Date: Thu, 17 Feb 2022 17:34:39 +0530 [thread overview]
Message-ID: <20220217120439.GC11964@workstation> (raw)
In-Reply-To: <1cdd8e0c-85d7-dd91-a6f1-1390e7854350@linaro.org>
On Tue, Feb 15, 2022 at 02:02:57PM -0600, Alex Elder wrote:
[...]
> > +
> > + mhi_dev = mhi_ep_alloc_device(mhi_cntrl, MHI_DEVICE_XFER);
> > + if (IS_ERR(mhi_dev))
> > + return PTR_ERR(mhi_dev);
>
> It looks like the only possible error is no memory, so you could
> just have mhi_ep_alloc_device() return NULL.
>
I think returning the actual error is more safe as we may end up adding more
stuff into this function in the future.
> > +
> > + /* Configure primary channel */
> > + mhi_dev->ul_chan = mhi_chan;
> > + get_device(&mhi_dev->dev);
> > + mhi_chan->mhi_dev = mhi_dev;
> > +
> > + /* Configure secondary channel as well */
> > + mhi_chan++;
> > + mhi_dev->dl_chan = mhi_chan;
> > + get_device(&mhi_dev->dev);
> > + mhi_chan->mhi_dev = mhi_dev;
> > +
> > + /* Channel name is same for both UL and DL */
> > + mhi_dev->name = mhi_chan->name;
> > + dev_set_name(&mhi_dev->dev, "%s_%s",
> > + dev_name(&mhi_cntrl->mhi_dev->dev),
> > + mhi_dev->name);
> > +
> > + ret = device_add(&mhi_dev->dev);
> > + if (ret)
> > + put_device(&mhi_dev->dev);
> > +
> > + return ret;
> > +}
> > +
> > +static int mhi_ep_destroy_device(struct device *dev, void *data)
> > +{
> > + struct mhi_ep_device *mhi_dev;
> > + struct mhi_ep_cntrl *mhi_cntrl;
> > + struct mhi_ep_chan *ul_chan, *dl_chan;
> > +
> > + if (dev->bus != &mhi_ep_bus_type)
> > + return 0;
> > +
> > + mhi_dev = to_mhi_ep_device(dev);
> > + mhi_cntrl = mhi_dev->mhi_cntrl;
> > +
> > + /* Only destroy devices created for channels */
> > + if (mhi_dev->dev_type == MHI_DEVICE_CONTROLLER)
> > + return 0;
> > +
> > + ul_chan = mhi_dev->ul_chan;
> > + dl_chan = mhi_dev->dl_chan;
>
> Aren't they required to supply *both* channels? Or maybe
> it's just required that there are transfer callback functions
> for both channels. Anyway, no need to check for null, because
> the creation function guarantees they're both non-null I think.
>
mhi_ep_destroy_device() will be called for each device separately. So we
must check for NULL.
Thanks,
Mani
next prev parent reply other threads:[~2022-02-17 12:04 UTC|newest]
Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-12 18:20 [PATCH v3 00/25] Add initial support for MHI endpoint stack Manivannan Sadhasivam
2022-02-12 18:20 ` [PATCH v3 01/25] bus: mhi: Fix pm_state conversion to string Manivannan Sadhasivam
2022-02-15 20:01 ` Alex Elder
2022-02-16 11:33 ` Manivannan Sadhasivam
2022-02-16 13:41 ` Alex Elder
2022-02-12 18:20 ` [PATCH v3 02/25] bus: mhi: Fix MHI DMA structure endianness Manivannan Sadhasivam
2022-02-15 20:02 ` Alex Elder
2022-02-16 7:04 ` Manivannan Sadhasivam
2022-02-16 14:29 ` Alex Elder
2022-02-12 18:20 ` [PATCH v3 03/25] bus: mhi: Move host MHI code to "host" directory Manivannan Sadhasivam
2022-02-15 20:02 ` Alex Elder
2022-02-12 18:20 ` [PATCH v3 04/25] bus: mhi: Move common MHI definitions out of host directory Manivannan Sadhasivam
2022-02-15 0:28 ` Hemant Kumar
2022-02-15 20:02 ` Alex Elder
2022-02-12 18:20 ` [PATCH v3 05/25] bus: mhi: Make mhi_state_str[] array static inline and move to common.h Manivannan Sadhasivam
2022-02-15 0:31 ` Hemant Kumar
2022-02-15 20:02 ` Alex Elder
2022-02-16 11:39 ` Manivannan Sadhasivam
2022-02-16 14:30 ` Alex Elder
2022-02-12 18:20 ` [PATCH v3 06/25] bus: mhi: Cleanup the register definitions used in headers Manivannan Sadhasivam
2022-02-15 0:37 ` Hemant Kumar
2022-02-15 20:02 ` Alex Elder
2022-02-16 17:21 ` Manivannan Sadhasivam
2022-02-16 17:43 ` Manivannan Sadhasivam
2022-02-12 18:20 ` [PATCH v3 07/25] bus: mhi: Get rid of SHIFT macros and use bitfield operations Manivannan Sadhasivam
2022-02-15 20:02 ` Alex Elder
2022-02-16 16:45 ` Manivannan Sadhasivam
2022-02-12 18:21 ` [PATCH v3 08/25] bus: mhi: ep: Add support for registering MHI endpoint controllers Manivannan Sadhasivam
2022-02-15 1:04 ` Hemant Kumar
2022-02-16 17:33 ` Manivannan Sadhasivam
2022-02-15 20:02 ` Alex Elder
2022-02-17 9:53 ` Manivannan Sadhasivam
2022-02-17 14:47 ` Alex Elder
2022-03-04 21:46 ` Jeffrey Hugo
2022-02-12 18:21 ` [PATCH v3 09/25] bus: mhi: ep: Add support for registering MHI endpoint client drivers Manivannan Sadhasivam
2022-02-12 18:32 ` Manivannan Sadhasivam
2022-02-15 1:10 ` Hemant Kumar
2022-02-15 20:02 ` Alex Elder
2022-02-17 10:20 ` Manivannan Sadhasivam
2022-02-17 14:50 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 10/25] bus: mhi: ep: Add support for creating and destroying MHI EP devices Manivannan Sadhasivam
2022-02-15 20:02 ` Alex Elder
2022-02-17 12:04 ` Manivannan Sadhasivam [this message]
2022-02-12 18:21 ` [PATCH v3 11/25] bus: mhi: ep: Add support for managing MMIO registers Manivannan Sadhasivam
2022-02-15 1:14 ` Hemant Kumar
2022-02-15 20:03 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 12/25] bus: mhi: ep: Add support for ring management Manivannan Sadhasivam
2022-02-15 20:03 ` Alex Elder
2022-02-18 8:07 ` Manivannan Sadhasivam
2022-02-18 15:23 ` Manivannan Sadhasivam
2022-02-18 15:47 ` Alex Elder
2022-02-18 15:39 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 13/25] bus: mhi: ep: Add support for sending events to the host Manivannan Sadhasivam
2022-02-15 22:39 ` Alex Elder
2022-02-22 6:06 ` Manivannan Sadhasivam
2022-02-22 13:41 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 14/25] bus: mhi: ep: Add support for managing MHI state machine Manivannan Sadhasivam
2022-02-15 22:39 ` Alex Elder
2022-02-22 7:03 ` Manivannan Sadhasivam
2022-02-12 18:21 ` [PATCH v3 15/25] bus: mhi: ep: Add support for processing MHI endpoint interrupts Manivannan Sadhasivam
2022-02-15 22:39 ` Alex Elder
2022-02-22 8:18 ` Manivannan Sadhasivam
2022-02-22 14:08 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 16/25] bus: mhi: ep: Add support for powering up the MHI endpoint stack Manivannan Sadhasivam
2022-02-15 22:39 ` Alex Elder
2022-02-22 9:08 ` Manivannan Sadhasivam
2022-02-22 14:10 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 17/25] bus: mhi: ep: Add support for powering down " Manivannan Sadhasivam
2022-02-15 22:39 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 18/25] bus: mhi: ep: Add support for handling MHI_RESET Manivannan Sadhasivam
2022-02-15 22:39 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 19/25] bus: mhi: ep: Add support for handling SYS_ERR condition Manivannan Sadhasivam
2022-02-15 22:39 ` Alex Elder
2022-02-22 10:29 ` Manivannan Sadhasivam
2022-02-12 18:21 ` [PATCH v3 20/25] bus: mhi: ep: Add support for processing command ring Manivannan Sadhasivam
2022-02-15 22:40 ` Alex Elder
2022-02-22 10:35 ` Manivannan Sadhasivam
2022-02-12 18:21 ` [PATCH v3 21/25] bus: mhi: ep: Add support for reading from the host Manivannan Sadhasivam
2022-02-15 22:40 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 22/25] bus: mhi: ep: Add support for processing transfer ring Manivannan Sadhasivam
2022-02-15 22:40 ` Alex Elder
2022-02-22 10:50 ` Manivannan Sadhasivam
2022-02-12 18:21 ` [PATCH v3 23/25] bus: mhi: ep: Add support for queueing SKBs to the host Manivannan Sadhasivam
2022-02-15 22:40 ` Alex Elder
2022-02-22 14:38 ` Manivannan Sadhasivam
2022-02-22 15:18 ` Alex Elder
2022-02-22 16:05 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 24/25] bus: mhi: ep: Add support for suspending and resuming channels Manivannan Sadhasivam
2022-02-15 22:40 ` Alex Elder
2022-02-12 18:21 ` [PATCH v3 25/25] bus: mhi: ep: Add uevent support for module autoloading Manivannan Sadhasivam
2022-02-15 22:40 ` Alex Elder
2022-02-15 20:01 ` [PATCH v3 00/25] Add initial support for MHI endpoint stack Alex Elder
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