From: Alexander Popov <alex.popov-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
To: Timur Tabi <timur-N01EOCouUvQ@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,
Alexander Popov
<alex.popov-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Subject: Re: [PATCH v3 1/3] powerpc/512x: add LocalPlus Bus FIFO device driver
Date: Tue, 29 Sep 2015 09:34:07 +0300 [thread overview]
Message-ID: <560A30DF.9050900@linux.com> (raw)
In-Reply-To: <56093E1D.4080008-N01EOCouUvQ@public.gmane.org>
On 28.09.2015 16:18, Timur Tabi wrote:
> 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.
I've double-checked the code and LDD and don't see any reason to avoid
calling dma_unmap_single() from interrupt context and within spinlock.
Please correct me if I'm wrong.
Thanks.
Best regards,
Alexander
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next prev parent reply other threads:[~2015-09-29 6:34 UTC|newest]
Thread overview: 19+ 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 ` [PATCH v3 1/3] " Alexander Popov
[not found] ` <1443115737-3948-2-git-send-email-alex.popov-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
2015-09-25 1:01 ` Timur Tabi
[not found] ` <56049CD0.7080104-N01EOCouUvQ@public.gmane.org>
2015-09-28 13:13 ` Alexander Popov
[not found] ` <56093CE5.5070301-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
2015-09-28 13:18 ` Timur Tabi
[not found] ` <56093E1D.4080008-N01EOCouUvQ@public.gmane.org>
2015-09-29 6:34 ` Alexander Popov [this message]
2015-09-30 21:24 ` Alexander Popov
[not found] ` <560C5325.6070406-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
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
[not found] ` <56093F89.1020004-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
2015-09-28 13:26 ` Timur Tabi
[not found] ` <5609401F.3010603-N01EOCouUvQ@public.gmane.org>
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
[not found] ` <1443115737-3948-4-git-send-email-alex.popov-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
2015-10-07 14:17 ` Vinod Koul
2015-10-07 21:31 ` Alexander Popov
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