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Fix build errors due to new UIO_MEM_DMA_COHERENT mess

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Commit 576882ef5e ("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: 576882ef5e ("uio: introduce UIO_MEM_DMA_COHERENT type")
Fixes: 7722151e46 ("uio_pruss: UIO_MEM_DMA_COHERENT conversion")
Fixes: 019947805a ("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>
This commit is contained in:
Linus Torvalds 2024-03-27 09:48:47 -07:00
parent 5b4cdd9c56
commit 498e47cd1d
3 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/uio/uio.c
View File

@ -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,

4
drivers/uio/uio_dmem_genirq.c
View File

@ -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;

2
drivers/uio/uio_pruss.c
View File

@ -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;