dmaengine: pl330: Correct device assignment.

Commit f6f2421c0a1c removed pl330_info structure by embedding it into
pl330_dmac structure, but did not ensure that the dmac->ddma.dev
pointer gets initialised before use. When dma_alloc_coherent() gets
called on arm64 a WARN() gets triggered due to dev being NULL.

------------[ cut here ]------------
WARNING: CPU: 1 PID: 1 at arch/arm64/mm/dma-mapping.c:49 __dma_alloc_coherent+0xd0/0xe0()
Use an actual device structure for DMA allocation
Modules linked in:
CPU: 1 PID: 1 Comm: swapper/0 Not tainted 3.17.0+ #5
Call trace:
[<ffffffc000087f24>] dump_backtrace+0x0/0x130
[<ffffffc000088064>] show_stack+0x10/0x1c
[<ffffffc0004e8af8>] dump_stack+0x74/0xb8
[<ffffffc0000aa444>] warn_slowpath_common+0x8c/0xb4
[<ffffffc0000aa4b8>] warn_slowpath_fmt+0x4c/0x58
[<ffffffc000092580>] __dma_alloc_coherent+0xcc/0xe0
[<ffffffc000092734>] __dma_alloc_noncoherent+0x64/0x158
[<ffffffc000312cd8>] pl330_probe+0x650/0x8f0
[<ffffffc00030e1d4>] amba_probe+0xa0/0xc8
[<ffffffc000350240>] really_probe+0xc4/0x22c
[<ffffffc0003504b4>] __driver_attach+0xa0/0xa8
[<ffffffc00034e5fc>] bus_for_each_dev+0x54/0x98
[<ffffffc00034fd8c>] driver_attach+0x1c/0x28
[<ffffffc00034fa08>] bus_add_driver+0x14c/0x204
[<ffffffc000350b84>] driver_register+0x64/0x130
[<ffffffc00030dcf8>] amba_driver_register+0x50/0x5c
[<ffffffc0006a60d0>] pl330_driver_init+0x10/0x1c
[<ffffffc0000814ac>] do_one_initcall+0x88/0x19c
[<ffffffc00068dab8>] kernel_init_freeable+0x140/0x1e0
[<ffffffc0004e5e18>] kernel_init+0x10/0xd4
---[ end trace 76f2d47a444e523e ]---
(NULL device *): dmac_alloc_resources:1821 Can't allocate memory!
(NULL device *): Unable to create channels for DMAC

This patch will also ensure that any dev_err messages are printed
with the appropriate device name.

Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>
Signed-off-by: Andrew Jackson <Andrew.Jackson@arm.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

diff --git a/drivers/dma/pl330.c b/drivers/dma/pl330.c
index 4839bfa74a107a1ad4cbdfb09017d86da1fd1a41..83e2257c324adc045ebf86101fdfc94cea9885f0 100644 (file)
--- a/drivers/dma/pl330.c
+++ b/drivers/dma/pl330.c
@@ -2610,6 +2610,9 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
                return -ENOMEM;
        }
 
+       pd = &pl330->ddma;
+       pd->dev = &adev->dev;
+
        pl330->mcbufsz = pdat ? pdat->mcbuf_sz : 0;
 
        res = &adev->res;
@@ -2646,7 +2649,6 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
        if (!add_desc(pl330, GFP_KERNEL, NR_DEFAULT_DESC))
                dev_warn(&adev->dev, "unable to allocate desc\n");
 
-       pd = &pl330->ddma;
        INIT_LIST_HEAD(&pd->channels);
 
        /* Initialize channel parameters */
@@ -2683,7 +2685,6 @@ pl330_probe(struct amba_device *adev, const struct amba_id *id)
                list_add_tail(&pch->chan.device_node, &pd->channels);
        }
 
-       pd->dev = &adev->dev;
        if (pdat) {
                pd->cap_mask = pdat->cap_mask;
        } else {