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uio-hv-generic: store physical addresses instead of virtual

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gcc warns about the newly added driver when phys_addr_t is wider than
a pointer:

drivers/uio/uio_hv_generic.c: In function 'hv_uio_mmap':
drivers/uio/uio_hv_generic.c:71:17: error: cast to pointer from integer of different size [-Werror=int-to-pointer-cast]
    virt_to_phys((void *)info->mem[mi].addr) >> PAGE_SHIFT,
drivers/uio/uio_hv_generic.c: In function 'hv_uio_probe':
drivers/uio/uio_hv_generic.c:140:5: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   = (phys_addr_t)dev->channel->ringbuffer_pages;
drivers/uio/uio_hv_generic.c:147:3: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   (phys_addr_t)vmbus_connection.int_page;
drivers/uio/uio_hv_generic.c:153:3: error: cast from pointer to integer of different size [-Werror=pointer-to-int-cast]
   (phys_addr_t)vmbus_connection.monitor_pages[1];

I can't see why we store a virtual address in a phys_addr_t here,
as the only user of that variable converts it into a physical
address anyway, so this moves the conversion to where it logically
fits according to the types.

Fixes: 95096f2fbd ("uio-hv-generic: new userspace i/o driver for VMBus")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Stephen Hemminger <sthemmin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2016-12-09 12:44:40 +01:00 committed by Greg Kroah-Hartman
parent 2eb72d4b79
commit 190cc65e91
1 changed files with 4 additions and 4 deletions
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8
drivers/uio/uio_hv_generic.c
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@ -68,7 +68,7 @@ hv_uio_mmap(struct uio_info *info, struct vm_area_struct *vma)
mi = (int)vma->vm_pgoff;
return remap_pfn_range(vma, vma->vm_start,
virt_to_phys((void *)info->mem[mi].addr) >> PAGE_SHIFT,
info->mem[mi].addr >> PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot);
}
@ -137,20 +137,20 @@ hv_uio_probe(struct hv_device *dev,
/* mem resources */
pdata->info.mem[TXRX_RING_MAP].name = "txrx_rings";
pdata->info.mem[TXRX_RING_MAP].addr
= (phys_addr_t)dev->channel->ringbuffer_pages;
= virt_to_phys(dev->channel->ringbuffer_pages);
pdata->info.mem[TXRX_RING_MAP].size
= dev->channel->ringbuffer_pagecount * PAGE_SIZE;
pdata->info.mem[TXRX_RING_MAP].memtype = UIO_MEM_LOGICAL;
pdata->info.mem[INT_PAGE_MAP].name = "int_page";
pdata->info.mem[INT_PAGE_MAP].addr =
(phys_addr_t)vmbus_connection.int_page;
virt_to_phys(vmbus_connection.int_page);
pdata->info.mem[INT_PAGE_MAP].size = PAGE_SIZE;
pdata->info.mem[INT_PAGE_MAP].memtype = UIO_MEM_LOGICAL;
pdata->info.mem[MON_PAGE_MAP].name = "monitor_pages";
pdata->info.mem[MON_PAGE_MAP].addr =
(phys_addr_t)vmbus_connection.monitor_pages[1];
virt_to_phys(vmbus_connection.monitor_pages[1]);
pdata->info.mem[MON_PAGE_MAP].size = PAGE_SIZE;
pdata->info.mem[MON_PAGE_MAP].memtype = UIO_MEM_LOGICAL;