Re: FAILED: patch "[PATCH] iio: adc: stm32-adc: fix device used to request dma" failed to apply to 5.4-stable tree

[Greg KH <gregkh@linuxfoundation.org>]

On Mon, May 25, 2020 at 04:52:01PM -0400, Sasha Levin wrote:
> On Mon, May 25, 2020 at 03:53:32PM +0200, gregkh@linuxfoundation.org wrote:
> > 
> > The patch below does not apply to the 5.4-stable tree.
> > If someone wants it applied there, or to any other stable or longterm
> > tree, then please email the backport, including the original git commit
> > id to <stable@vger.kernel.org>.
> > 
> > thanks,
> > 
> > greg k-h
> > 
> > ------------------ original commit in Linus's tree ------------------
> > 
> > > From 52cd91c27f3908b88e8b25aed4a4d20660abcc45 Mon Sep 17 00:00:00 2001
> > From: Fabrice Gasnier <fabrice.gasnier@st.com>
> > Date: Thu, 30 Apr 2020 11:28:45 +0200
> > Subject: [PATCH] iio: adc: stm32-adc: fix device used to request dma
> > 
> > DMA channel request should use device struct from platform device struct.
> > Currently it's using iio device struct. But at this stage when probing,
> > device struct isn't yet registered (e.g. device_register is done in
> > iio_device_register). Since commit 71723a96b8b1 ("dmaengine: Create
> > symlinks between DMA channels and slaves"), a warning message is printed
> > as the links in sysfs can't be created, due to device isn't yet registered:
> > - Cannot create DMA slave symlink
> > - Cannot create DMA dma:rx symlink
> > 
> > Fix this by using device struct from platform device to request dma chan.
> > 
> > Fixes: 2763ea0585c99 ("iio: adc: stm32: add optional dma support")
> > 
> > Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
> > Cc: <Stable@vger.kernel.org>
> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
> 
> I've also grabbed 735404b846df ("iio: adc: stm32-adc: Use
> dma_request_chan() instead dma_request_slave_channel()") and queued both
> for 5.4, 4.19, and 4.14.

Thanks for this, and all of the other fixups you added to the queue.

greg k-h