From: Timur Tabi <timur@tabi.org>
To: alex.popov@linux.com,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Anatolij Gustschin <agust@denx.de>, Rob Herring <robh@kernel.org>,
Grant Likely <grant.likely@linaro.org>,
Dan Williams <dan.j.williams@intel.com>,
Vinod Koul <vinod.koul@intel.com>,
Pawel Moll <pawel.moll@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Ian Campbell <ijc+devicetree@hellion.org.uk>,
Kumar Gala <galak@codeaurora.org>,
linuxppc-dev@lists.ozlabs.org, dmaengine@vger.kernel.org,
devicetree@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v3 1/3] powerpc/512x: add LocalPlus Bus FIFO device driver
Date: Mon, 28 Sep 2015 08:18:21 -0500 [thread overview]
Message-ID: <56093E1D.4080008@tabi.org> (raw)
In-Reply-To: <56093CE5.5070301@linux.com>
Alexander Popov wrote:
> The only question I have: why calling dma_unmap_single() from within
> a spinlock is a bad practice?
I don't know, but usually functions that allocate or free memory cannot
be called from within a spinlock. You need to check that. Since the
MPC5121 is a single-core CPU, you might not notice if you're doing
something wrong.
WARNING: multiple messages have this Message-ID (diff)
From: Timur Tabi <timur-N01EOCouUvQ@public.gmane.org>
To: alex.popov-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org,
Benjamin Herrenschmidt
<benh-XVmvHMARGAS8U2dJNN8I7kB+6BGkLq7r@public.gmane.org>,
Paul Mackerras <paulus-eUNUBHrolfbYtjvyW6yDsg@public.gmane.org>,
Michael Ellerman <mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org>,
Anatolij Gustschin <agust-ynQEQJNshbs@public.gmane.org>,
Rob Herring <robh-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Grant Likely
<grant.likely-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org>,
Dan Williams
<dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Vinod Koul <vinod.koul-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>,
Pawel Moll <pawel.moll-5wv7dgnIgG8@public.gmane.org>,
Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
Ian Campbell
<ijc+devicetree-KcIKpvwj1kUDXYZnReoRVg@public.gmane.org>,
Kumar Gala <galak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org,
dmaengine-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: Re: [PATCH v3 1/3] powerpc/512x: add LocalPlus Bus FIFO device driver
Date: Mon, 28 Sep 2015 08:18:21 -0500 [thread overview]
Message-ID: <56093E1D.4080008@tabi.org> (raw)
In-Reply-To: <56093CE5.5070301-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Alexander Popov wrote:
> The only question I have: why calling dma_unmap_single() from within
> a spinlock is a bad practice?
I don't know, but usually functions that allocate or free memory cannot
be called from within a spinlock. You need to check that. Since the
MPC5121 is a single-core CPU, you might not notice if you're doing
something wrong.
--
To unsubscribe from this list: send the line "unsubscribe devicetree" in
the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2015-09-28 13:18 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-24 17:28 [PATCH v3 0/3] powerpc/512x: add LocalPlus Bus FIFO device driver Alexander Popov
2015-09-24 17:28 ` Alexander Popov
2015-09-24 17:28 ` [PATCH v3 1/3] " Alexander Popov
2015-09-25 1:01 ` Timur Tabi
2015-09-25 1:01 ` Timur Tabi
2015-09-28 13:13 ` Alexander Popov
2015-09-28 13:13 ` Alexander Popov
2015-09-28 13:18 ` Timur Tabi [this message]
2015-09-28 13:18 ` Timur Tabi
2015-09-29 6:34 ` Alexander Popov
2015-09-29 6:34 ` Alexander Popov
2015-09-30 21:24 ` Alexander Popov
2015-10-01 17:11 ` Timur Tabi
2015-10-01 17:11 ` Timur Tabi
2015-10-05 22:22 ` Alexander Popov
2015-09-24 17:28 ` [PATCH v3 2/3] powerpc/512x: add a device tree binding for LocalPlus Bus FIFO Alexander Popov
2015-09-25 0:18 ` Timur Tabi
2015-09-28 13:24 ` Alexander Popov
2015-09-28 13:26 ` Timur Tabi
2015-09-28 13:26 ` Timur Tabi
2015-09-29 6:35 ` Alexander Popov
2015-09-29 6:35 ` Alexander Popov
2015-09-24 17:28 ` [PATCH v3 3/3] dmaengine: mpc512x: initialize with subsys_initcall() Alexander Popov
2015-09-25 0:16 ` Timur Tabi
2015-09-28 13:15 ` Alexander Popov
2015-10-07 14:17 ` Vinod Koul
2015-10-07 14:17 ` Vinod Koul
2015-10-07 21:31 ` Alexander Popov
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=56093E1D.4080008@tabi.org \
--to=timur@tabi.org \
--cc=agust@denx.de \
--cc=alex.popov@linux.com \
--cc=benh@kernel.crashing.org \
--cc=dan.j.williams@intel.com \
--cc=devicetree@vger.kernel.org \
--cc=dmaengine@vger.kernel.org \
--cc=galak@codeaurora.org \
--cc=grant.likely@linaro.org \
--cc=ijc+devicetree@hellion.org.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mark.rutland@arm.com \
--cc=mpe@ellerman.id.au \
--cc=paulus@samba.org \
--cc=pawel.moll@arm.com \
--cc=robh@kernel.org \
--cc=vinod.koul@intel.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.