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ntb: Store original DMA address for future release

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The DMA API requires that dma_free_attrs receive the exact dma_handle
originally returned by the allocation function. Do not modify it.

Fixes: fc5d1829f9 ("NTB: transport: Try harder to alloc an aligned MW buffer")
Signed-off-by: Leon Romanovsky <leonro@nvidia.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260501-dma-attrs-debug-v2-1-8dbac75cd501@nvidia.com
This commit is contained in:
Leon Romanovsky
2026-05-01 09:35:05 +03:00
committed by Marek Szyprowski
parent 254f49634e
commit da6d997ac5
1 changed files with 3 additions and 1 deletions
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4
drivers/ntb/ntb_transport.c
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@@ -223,6 +223,7 @@ struct ntb_transport_mw {
void *alloc_addr;
void *virt_addr;
dma_addr_t dma_addr;
dma_addr_t original_dma_addr;
};
struct ntb_transport_client_dev {
@@ -766,7 +767,7 @@ static void ntb_free_mw(struct ntb_transport_ctx *nt, int num_mw)
ntb_mw_clear_trans(nt->ndev, PIDX, num_mw);
dma_free_coherent(dma_dev, mw->alloc_size,
mw->alloc_addr, mw->dma_addr);
mw->alloc_addr, mw->original_dma_addr);
mw->xlat_size = 0;
mw->buff_size = 0;
mw->alloc_size = 0;
@@ -802,6 +803,7 @@ static int ntb_alloc_mw_buffer(struct ntb_transport_mw *mw,
return -ENOMEM;
}
virt_addr = alloc_addr;
mw->original_dma_addr = dma_addr;
/*
* we must ensure that the memory address allocated is BAR size