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authorLinus Torvalds <torvalds@linux-foundation.org>2024-03-27 09:48:47 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2024-03-27 09:48:47 -0700
commit498e47cd1d1f3e0a870a29d1b28093e64db52fd2 (patch)
tree2bd5600a3d8a5889322698819520a78d107dff26
parent5b4cdd9c5676559b8a7c944ac5269b914b8c0bb8 (diff)
Fix build errors due to new UIO_MEM_DMA_COHERENT mess
Commit 576882ef5e7f ("uio: introduce UIO_MEM_DMA_COHERENT type") introduced a new use-case for 'struct uio_mem' where the 'mem' field now contains a kernel virtual address when 'memtype' is set to UIO_MEM_DMA_COHERENT. That in turn causes build errors, because 'mem' is of type 'phys_addr_t', and a virtual address is a pointer type. When the code just blindly uses cast to mix the two, it caused problems when phys_addr_t isn't the same size as a pointer - notably on 32-bit architectures with PHYS_ADDR_T_64BIT. The proper thing to do would probably be to use a union member, and not have any casts, and make the 'mem' member be a union of 'mem.physaddr' and 'mem.vaddr', based on 'memtype'. This is not that proper thing. This is just fixing the ugly casts to be even uglier, but at least not cause build errors on 32-bit platforms with 64-bit physical addresses. Reported-by: Guenter Roeck <linux@roeck-us.net> Fixes: 576882ef5e7f ("uio: introduce UIO_MEM_DMA_COHERENT type") Fixes: 7722151e4651 ("uio_pruss: UIO_MEM_DMA_COHERENT conversion") Fixes: 019947805a8d ("uio_dmem_genirq: UIO_MEM_DMA_COHERENT conversion") Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Chris Leech <cleech@redhat.com> Cc: Nilesh Javali <njavali@marvell.com> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Linus Torvalds <torvalds@linuxfoundation.org>
-rw-r--r--drivers/uio/uio.c2
-rw-r--r--drivers/uio/uio_dmem_genirq.c4
-rw-r--r--drivers/uio/uio_pruss.c2
3 files changed, 4 insertions, 4 deletions
diff --git a/drivers/uio/uio.c b/drivers/uio/uio.c
index bb77de6fa067..009158fef2a8 100644
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -792,7 +792,7 @@ static int uio_mmap_dma_coherent(struct vm_area_struct *vma)
*/
vma->vm_pgoff = 0;
- addr = (void *)mem->addr;
+ addr = (void *)(uintptr_t)mem->addr;
ret = dma_mmap_coherent(mem->dma_device,
vma,
addr,
diff --git a/drivers/uio/uio_dmem_genirq.c b/drivers/uio/uio_dmem_genirq.c
index d5f9384df125..13cc35ab5d29 100644
--- a/drivers/uio/uio_dmem_genirq.c
+++ b/drivers/uio/uio_dmem_genirq.c
@@ -60,7 +60,7 @@ static int uio_dmem_genirq_open(struct uio_info *info, struct inode *inode)
addr = dma_alloc_coherent(&priv->pdev->dev, uiomem->size,
&uiomem->dma_addr, GFP_KERNEL);
- uiomem->addr = addr ? (phys_addr_t) addr : DMEM_MAP_ERROR;
+ uiomem->addr = addr ? (uintptr_t) addr : DMEM_MAP_ERROR;
++uiomem;
}
priv->refcnt++;
@@ -89,7 +89,7 @@ static int uio_dmem_genirq_release(struct uio_info *info, struct inode *inode)
break;
if (uiomem->addr) {
dma_free_coherent(uiomem->dma_device, uiomem->size,
- (void *) uiomem->addr,
+ (void *) (uintptr_t) uiomem->addr,
uiomem->dma_addr);
}
uiomem->addr = DMEM_MAP_ERROR;
diff --git a/drivers/uio/uio_pruss.c b/drivers/uio/uio_pruss.c
index 72b33f7d4c40..f67881cba645 100644
--- a/drivers/uio/uio_pruss.c
+++ b/drivers/uio/uio_pruss.c
@@ -191,7 +191,7 @@ static int pruss_probe(struct platform_device *pdev)
p->mem[1].size = sram_pool_sz;
p->mem[1].memtype = UIO_MEM_PHYS;
- p->mem[2].addr = (phys_addr_t) gdev->ddr_vaddr;
+ p->mem[2].addr = (uintptr_t) gdev->ddr_vaddr;
p->mem[2].dma_addr = gdev->ddr_paddr;
p->mem[2].size = extram_pool_sz;
p->mem[2].memtype = UIO_MEM_DMA_COHERENT;