5.15-stable review patch. If anyone has any objections, please let me know.
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From: Mark-PK Tsai mark-pk.tsai@mediatek.com
[ Upstream commit e61c451476e61450f6771ce03bbc01210a09be16 ]
Add dma_release_coherent_memory to DMA API to allow dma user call it to release dev->dma_mem when the device is removed.
Signed-off-by: Mark-PK Tsai mark-pk.tsai@mediatek.com Acked-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20220422062436.14384-2-mark-pk.tsai@mediatek.com Signed-off-by: Mathieu Poirier mathieu.poirier@linaro.org Stable-dep-of: b07bc2347672 ("dma-mapping: clear dev->dma_mem to NULL after freeing it") Signed-off-by: Sasha Levin sashal@kernel.org --- include/linux/dma-map-ops.h | 3 +++ kernel/dma/coherent.c | 10 ++++++++-- 2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/include/linux/dma-map-ops.h b/include/linux/dma-map-ops.h index 0d5b06b3a4a6..53db9655efe9 100644 --- a/include/linux/dma-map-ops.h +++ b/include/linux/dma-map-ops.h @@ -166,6 +166,7 @@ static inline void dma_pernuma_cma_reserve(void) { } #ifdef CONFIG_DMA_DECLARE_COHERENT int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr, dma_addr_t device_addr, size_t size); +void dma_release_coherent_memory(struct device *dev); int dma_alloc_from_dev_coherent(struct device *dev, ssize_t size, dma_addr_t *dma_handle, void **ret); int dma_release_from_dev_coherent(struct device *dev, int order, void *vaddr); @@ -177,6 +178,8 @@ static inline int dma_declare_coherent_memory(struct device *dev, { return -ENOSYS; } + +#define dma_release_coherent_memory(dev) (0) #define dma_alloc_from_dev_coherent(dev, size, handle, ret) (0) #define dma_release_from_dev_coherent(dev, order, vaddr) (0) #define dma_mmap_from_dev_coherent(dev, vma, vaddr, order, ret) (0) diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c index 25fc85a7aebe..ca05989d9901 100644 --- a/kernel/dma/coherent.c +++ b/kernel/dma/coherent.c @@ -75,7 +75,7 @@ static struct dma_coherent_mem *dma_init_coherent_memory(phys_addr_t phys_addr, return ERR_PTR(-ENOMEM); }
-static void dma_release_coherent_memory(struct dma_coherent_mem *mem) +static void _dma_release_coherent_memory(struct dma_coherent_mem *mem) { if (!mem) return; @@ -127,10 +127,16 @@ int dma_declare_coherent_memory(struct device *dev, phys_addr_t phys_addr,
ret = dma_assign_coherent_memory(dev, mem); if (ret) - dma_release_coherent_memory(mem); + _dma_release_coherent_memory(mem); return ret; }
+void dma_release_coherent_memory(struct device *dev) +{ + if (dev) + _dma_release_coherent_memory(dev->dma_mem); +} + static void *__dma_alloc_from_coherent(struct device *dev, struct dma_coherent_mem *mem, ssize_t size, dma_addr_t *dma_handle)