On 2020-09-08 17:47, Christoph Hellwig wrote:
Driver that select DMA_OPS need to depend on HAS_DMA support to
work.  The vop driver was missing that dependency, so add it, and also
add a nother depends in DMA_OPS itself.  That won't fix the issue due
to how the Kconfig dependencies work, but at least produce a warning
about unmet dependencies.

Signed-off-by: Christoph Hellwig <h...@lst.de>
---
  drivers/misc/mic/Kconfig | 1 +
  kernel/dma/Kconfig       | 1 +
  2 files changed, 2 insertions(+)

diff --git a/drivers/misc/mic/Kconfig b/drivers/misc/mic/Kconfig
index b9bb086785db48..8a7c2c5711d5f4 100644
--- a/drivers/misc/mic/Kconfig
+++ b/drivers/misc/mic/Kconfig
@@ -35,6 +35,7 @@ config SCIF_BUS
config VOP_BUS
        tristate "VOP Bus Driver"
+       depends on HAS_DMA
        select DMA_OPS

AFAICS all three of these bus drivers are only proxying a struct dma_map_ops * pointer around, so if they used the set_dma_ops() helper they shouldn't even need these selects at all. Only INTEL_MIC_HOST appears to have a logical dependency on DMA_OPS for actual functionality.

However, I have a vague feeling you might not be fond of those dma_ops helpers, and I have no great objection to this one-liner as-is, so (modulo the couple of commit message typos),

Reviewed-by: Robin Murphy <robin.mur...@arm.com>

(of course the hunk below is unquestionably OK)

Robin.

        help
          This option is selected by any driver which registers a
diff --git a/kernel/dma/Kconfig b/kernel/dma/Kconfig
index 0ddfb5510fe45f..e7b801649f6574 100644
--- a/kernel/dma/Kconfig
+++ b/kernel/dma/Kconfig
@@ -9,6 +9,7 @@ config HAS_DMA
        default y
config DMA_OPS
+       depends on HAS_DMA
        bool
#

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