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    SubjectRe: [PATCH 4.14 064/109] dmaengine: bcm2835-dma: Use vchan_terminate_vdesc() instead of desc_free
    On Fri, Mar 16, 2018 at 01:46:40PM -0500, Dan Rue wrote:
    > On Fri, Mar 16, 2018 at 04:23:33PM +0100, Greg Kroah-Hartman wrote:
    > > 4.14-stable review patch. If anyone has any objections, please let me know.
    > >
    > > ------------------
    > >
    > > From: Peter Ujfalusi <peter.ujfalusi@ti.com>
    > >
    > >
    > > [ Upstream commit de92436ac40ffe9933230aa503e24dbb5ede9201 ]
    > >
    > > To avoid race with vchan_complete, use the race free way to terminate
    > > running transfer.
    > >
    > > Implement the device_synchronize callback to make sure that the terminated
    > > descriptor is freed.
    > >
    > > Signed-off-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
    > > Acked-by: Eric Anholt <eric@anholt.net>
    > > Signed-off-by: Vinod Koul <vinod.koul@intel.com>
    > > Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
    > > Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    >
    > This patch is causing a build error on arm and arm64 per i.e.
    > https://kernelci.org/build/id/5aac017e59b5141cb1b3a4d5/
    >
    > Builds are also failing for arm/arm64 on 4.15 and this patch seems to be a
    > problem there as well, but I have not verified it yet.

    I think we are missing commit 1c7f072d94e8. Pls cherrypick that as well

    commit 1c7f072d94e8b697fd9b70cdb268622a18faf522
    Author: Peter Ujfalusi <peter.ujfalusi@ti.com>
    Date: Tue Nov 14 16:32:04 2017 +0200

    dmaengine: virt-dma: Support for race free transfer termination

    This adds vchan_terminate_vdesc API..


    >
    > #
    > # make -j10 -k -s ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- O=build-arm64 defconfig
    > #
    > #
    > # make -j10 -k -s ARCH=arm64 CROSS_COMPILE=aarch64-linux-gnu- O=build-arm64
    > #
    > arch/arm64/Makefile:48: Detected assembler with broken .inst; disassembly will be unreliable
    > ../drivers/dma/bcm2835-dma.c: In function 'bcm2835_dma_terminate_all':
    > ../drivers/dma/bcm2835-dma.c:815:3: error: implicit declaration of function 'vchan_terminate_vdesc' [-Werror=implicit-function-declaration]
    > vchan_terminate_vdesc(&c->desc->vd);
    > ^
    > cc1: some warnings being treated as errors
    > ../scripts/Makefile.build:334: recipe for target 'drivers/dma/bcm2835-dma.o' failed
    > make[3]: *** [drivers/dma/bcm2835-dma.o] Error 1
    > make[3]: Target '__build' not remade because of errors.
    > ../scripts/Makefile.build:587: recipe for target 'drivers/dma' failed
    > make[2]: *** [drivers/dma] Error 2
    > make[2]: Target '__build' not remade because of errors.
    > /home/buildslave/workspace/kernel-single-defconfig-builder/defconfig/defconfig/label/builder/Makefile:1031: recipe for target 'drivers' failed
    > make[1]: *** [drivers] Error 2
    > make[1]: Target '_all' not remade because of errors.
    > Makefile:146: recipe for target 'sub-make' failed
    > make: *** [sub-make] Error 2
    > make: Target '_all' not remade because of errors.
    >
    > > ---
    > > drivers/dma/bcm2835-dma.c | 10 +++++++++-
    > > 1 file changed, 9 insertions(+), 1 deletion(-)
    > >
    > > --- a/drivers/dma/bcm2835-dma.c
    > > +++ b/drivers/dma/bcm2835-dma.c
    > > @@ -812,7 +812,7 @@ static int bcm2835_dma_terminate_all(str
    > > * c->desc is NULL and exit.)
    > > */
    > > if (c->desc) {
    > > - bcm2835_dma_desc_free(&c->desc->vd);
    > > + vchan_terminate_vdesc(&c->desc->vd);
    > > c->desc = NULL;
    > > bcm2835_dma_abort(c->chan_base);
    > >
    > > @@ -836,6 +836,13 @@ static int bcm2835_dma_terminate_all(str
    > > return 0;
    > > }
    > >
    > > +static void bcm2835_dma_synchronize(struct dma_chan *chan)
    > > +{
    > > + struct bcm2835_chan *c = to_bcm2835_dma_chan(chan);
    > > +
    > > + vchan_synchronize(&c->vc);
    > > +}
    > > +
    > > static int bcm2835_dma_chan_init(struct bcm2835_dmadev *d, int chan_id,
    > > int irq, unsigned int irq_flags)
    > > {
    > > @@ -942,6 +949,7 @@ static int bcm2835_dma_probe(struct plat
    > > od->ddev.device_prep_dma_memcpy = bcm2835_dma_prep_dma_memcpy;
    > > od->ddev.device_config = bcm2835_dma_slave_config;
    > > od->ddev.device_terminate_all = bcm2835_dma_terminate_all;
    > > + od->ddev.device_synchronize = bcm2835_dma_synchronize;
    > > od->ddev.src_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
    > > od->ddev.dst_addr_widths = BIT(DMA_SLAVE_BUSWIDTH_4_BYTES);
    > > od->ddev.directions = BIT(DMA_DEV_TO_MEM) | BIT(DMA_MEM_TO_DEV) |
    > >
    > >

    --
    ~Vinod

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