From: Vinod Koul <vinod.koul@intel.com>
To: Takashi Iwai <tiwai@suse.de>
Cc: ALSA <alsa-devel@alsa-project.org>,
Charles Keepax <ckeepax@opensource.cirrus.com>,
patches.audio@intel.com,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
plai@codeaurora.org, LKML <linux-kernel@vger.kernel.org>,
Pierre <pierre-louis.bossart@linux.intel.com>,
Sagar Dharia <sdharia@codeaurora.org>, Mark <broonie@kernel.org>,
srinivas.kandagatla@linaro.org, Shreyas NC <shreyas.nc@intel.com>,
Sanyog Kale <sanyog.r.kale@intel.com>,
Sudheer Papothi <spapothi@codeaurora.org>,
alan@linux.intel.com
Subject: Re: [alsa-devel] [PATCH 06/14] soundwire: Add IO transfer
Date: Fri, 20 Oct 2017 21:18:03 +0530 [thread overview]
Message-ID: <20171020154803.GQ30097@localhost> (raw)
In-Reply-To: <s5ho9p2uwm2.wl-tiwai@suse.de>
On Fri, Oct 20, 2017 at 09:06:13AM +0200, Takashi Iwai wrote:
> On Fri, 20 Oct 2017 07:30:06 +0200,
> Vinod Koul wrote:
> >
> > On Thu, Oct 19, 2017 at 11:13:48AM +0200, Takashi Iwai wrote:
> > > On Thu, 19 Oct 2017 05:03:22 +0200,
> > > Vinod Koul wrote:
> > > >
> > > > +/**
> > > > + * sdw_transfer: Synchronous transfer message to a SDW Slave device
> > > > + *
> > > > + * @bus: SDW bus
> > > > + * @slave: SDW Slave
> > > > + * @msg: SDW message to be xfered
> > > > + */
> > > > +int sdw_transfer(struct sdw_bus *bus, struct sdw_slave *slave,
> > > > + struct sdw_msg *msg)
> > > > +{
> > > > + bool page;
> > > > + int ret;
> > > > +
> > > > + mutex_lock(&bus->msg_lock);
> > > > +
> > > > + page = sdw_get_page(slave, msg);
> > > > +
> > > > + ret = do_transfer(bus, msg, page);
> > > > + if (ret != 0 && ret != -ENODATA) {
> > > > + dev_err(bus->dev, "trf on Slave %d failed:%d\n",
> > > > + msg->dev_num, ret);
> > > > + goto error;
> > > > + }
> > > > +
> > > > + if (page)
> > > > + ret = sdw_reset_page(bus, msg->dev_num);
> > > > +
> > > > +error:
> > > > + mutex_unlock(&bus->msg_lock);
> > > > +
> > > > + return ret;
> > >
> > > So the logic here is that when -ENODATA is returned and page is false,
> > > this function should return -ENODATA to the caller, but when page
> > > is set, it returns 0?
> >
> > Sorry no. do_transfer can succced (0) or in some case where Slaves didn't
> > care for return error (ENODATA), or other errors.
> > No ENODATA can be error depending on message sent so we dont treat this as
> > failure and let caller decide.
> >
> > In case of errors (others) we don't need to reset page and we bail out
>
> Well, the question is the handling of ENODATA. Whether the function
> returns 0 or -ENODATA depends on page flag. If page flag is true,
> -ENODATA is cleared. My question was whether this behavior is
> intended or not.
>
> If -ENODATA should be returned whenever it gets that from
> do_transfer(), the code has a potential bug there.
Ah right, the return from do_transfer needs to preserved in that case. I
will fix that up, thanks for spotting :)
--
~Vinod
next prev parent reply other threads:[~2017-10-20 15:43 UTC|newest]
Thread overview: 94+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-10-19 3:03 [PATCH 00/14] soundwire: Add a new SoundWire subsystem Vinod Koul
2017-10-19 3:03 ` [PATCH 01/14] Documentation: Add SoundWire summary Vinod Koul
2017-10-19 3:33 ` Randy Dunlap
2017-10-19 4:44 ` Vinod Koul
2017-10-20 10:39 ` Greg Kroah-Hartman
2017-10-20 15:49 ` Vinod Koul
2017-10-20 16:22 ` Greg Kroah-Hartman
2017-10-20 17:09 ` Vinod Koul
2017-10-21 8:57 ` Mark Brown
2017-10-21 11:28 ` Vinod Koul
2017-10-22 10:06 ` [alsa-devel] " Pierre-Louis Bossart
2017-10-23 8:21 ` Mark Brown
2017-10-23 7:50 ` Mark Brown
2017-10-23 11:18 ` [alsa-devel] " Vinod Koul
2017-10-19 3:03 ` [PATCH 02/14] soundwire: Add SoundWire bus type Vinod Koul
2017-10-19 7:40 ` Takashi Iwai
2017-10-19 8:32 ` [alsa-devel] " Takashi Iwai
2017-10-20 5:11 ` Vinod Koul
2017-10-20 6:59 ` Takashi Iwai
2017-10-20 15:46 ` Vinod Koul
2017-10-20 15:50 ` Takashi Iwai
2017-10-20 16:11 ` Vinod Koul
2017-10-20 10:41 ` Greg Kroah-Hartman
2017-10-20 15:52 ` Vinod Koul
2017-10-20 10:45 ` Greg Kroah-Hartman
2017-10-20 16:01 ` Vinod Koul
2017-10-20 16:21 ` Greg Kroah-Hartman
2017-10-20 17:10 ` Vinod Koul
2017-10-23 11:46 ` Alan Cox
2017-10-26 8:33 ` Vinod Koul
2017-10-27 8:57 ` Greg Kroah-Hartman
2017-10-30 13:11 ` Vinod Koul
2017-10-20 16:03 ` Philippe Ombredanne
2017-10-20 16:20 ` Vinod Koul
2017-10-20 16:27 ` Greg Kroah-Hartman
2017-10-20 17:13 ` Vinod Koul
2017-10-23 11:52 ` Alan Cox
2017-10-21 9:03 ` Mark Brown
2017-10-21 11:29 ` Vinod Koul
2017-11-09 21:14 ` Srinivas Kandagatla
2017-11-10 4:59 ` Vinod Koul
2017-11-10 8:55 ` Vinod Koul
2017-11-10 10:50 ` Srinivas Kandagatla
2017-11-10 10:42 ` Srinivas Kandagatla
2017-11-10 10:58 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 03/14] soundwire: Add Master registration Vinod Koul
2017-10-19 8:54 ` [alsa-devel] " Takashi Iwai
2017-10-20 5:19 ` Vinod Koul
2017-10-20 10:47 ` Greg Kroah-Hartman
2017-10-20 16:05 ` Vinod Koul
2017-10-21 9:12 ` Mark Brown
2017-10-21 11:35 ` Vinod Koul
2017-10-23 8:24 ` Mark Brown
2017-10-23 11:19 ` Vinod Koul
2017-11-09 21:14 ` Srinivas Kandagatla
2017-11-10 5:02 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 04/14] soundwire: Add MIPI DisCo property helpers Vinod Koul
2017-10-19 9:02 ` [alsa-devel] " Takashi Iwai
2017-10-20 5:25 ` Vinod Koul
2017-10-21 9:20 ` Mark Brown
2017-10-21 11:37 ` Vinod Koul
2017-10-22 10:14 ` [alsa-devel] " Pierre-Louis Bossart
2017-10-19 3:03 ` [PATCH 05/14] soundwire: Add SoundWire MIPI defined registers Vinod Koul
2017-10-19 3:03 ` [PATCH 06/14] soundwire: Add IO transfer Vinod Koul
2017-10-19 9:13 ` [alsa-devel] " Takashi Iwai
2017-10-20 5:30 ` Vinod Koul
2017-10-20 7:06 ` Takashi Iwai
2017-10-20 15:48 ` Vinod Koul [this message]
2017-10-21 9:29 ` Mark Brown
2017-10-21 11:40 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 07/14] regmap: Add SoundWire bus support Vinod Koul
2017-10-21 9:34 ` Mark Brown
2017-10-21 11:44 ` Vinod Koul
2017-10-23 11:56 ` Alan Cox
2017-10-23 13:16 ` Mark Brown
2017-10-19 3:03 ` [PATCH 08/14] soundwire: Add Slave status handling helpers Vinod Koul
2017-10-19 13:44 ` [alsa-devel] " Takashi Iwai
2017-10-31 13:04 ` Vinod Koul
2017-10-31 21:19 ` Pierre-Louis Bossart
2017-11-01 9:08 ` Vinod Koul
2017-11-01 21:10 ` Pierre-Louis Bossart
2017-11-02 3:28 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 09/14] soundwire: Add slave status handling Vinod Koul
2017-10-19 3:03 ` [PATCH 10/14] soundwire: Add sysfs for SoundWire DisCo properties Vinod Koul
2017-10-21 9:42 ` Mark Brown
2017-10-21 11:53 ` Vinod Koul
2017-11-09 21:14 ` Srinivas Kandagatla
2017-11-10 4:52 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 11/14] soundwire: cdns: Add cadence module Vinod Koul
2017-10-21 9:52 ` Mark Brown
2017-10-21 11:54 ` Vinod Koul
2017-10-19 3:03 ` [PATCH 12/14] soundwire: cdns: Add sdw_master_ops and IO transfer support Vinod Koul
2017-10-19 3:03 ` [PATCH 13/14] soundwire: intel: Add Intel Master driver Vinod Koul
2017-10-19 3:03 ` [PATCH 14/14] soundwire: intel: Add Intel init module Vinod Koul
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