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/dev/mem: Use more consistent data types

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The xlate_dev_{kmem,mem}_ptr() functions take either a physical address
or a kernel virtual address, so data types should be phys_addr_t and
void *. They both return a kernel virtual address which is only ever
used in calls to copy_{from,to}_user(), so make variables that store it
void * rather than char * for consistency.

Also only define a weak unxlate_dev_mem_ptr() function if architectures
haven't overridden them in the asm/io.h header file.

Signed-off-by: Thierry Reding <treding@nvidia.com>
This commit is contained in:
Thierry Reding 2014-07-28 17:20:33 +02:00
parent dc01201476
commit 4707a341b4
5 changed files with 17 additions and 13 deletions
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5
arch/s390/include/asm/io.h
View File

@ -13,9 +13,10 @@
#include <asm/page.h>
#include <asm/pci_io.h>
void *xlate_dev_mem_ptr(unsigned long phys);
#define xlate_dev_mem_ptr xlate_dev_mem_ptr
void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
void *xlate_dev_mem_ptr(phys_addr_t phys);
#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
/*
* Convert a virtual cached pointer to an uncached pointer

4
arch/s390/mm/maccess.c
View File

@ -176,7 +176,7 @@ static int is_swapped(unsigned long addr)
* For swapped prefix pages a new buffer is returned that contains a copy of
* the absolute memory. The buffer size is maximum one page large.
*/
void *xlate_dev_mem_ptr(unsigned long addr)
void *xlate_dev_mem_ptr(phys_addr_t addr)
{
void *bounce = (void *) addr;
unsigned long size;
@ -197,7 +197,7 @@ void *xlate_dev_mem_ptr(unsigned long addr)
/*
* Free converted buffer for /dev/mem access (if necessary)
*/
void unxlate_dev_mem_ptr(unsigned long addr, void *buf)
void unxlate_dev_mem_ptr(phys_addr_t addr, void *buf)
{
if ((void *) addr != buf)
free_page((unsigned long) buf);

4
arch/x86/include/asm/io.h
View File

@ -310,8 +310,8 @@ BUILDIO(b, b, char)
BUILDIO(w, w, short)
BUILDIO(l, , int)
extern void *xlate_dev_mem_ptr(unsigned long phys);
extern void unxlate_dev_mem_ptr(unsigned long phys, void *addr);
extern void *xlate_dev_mem_ptr(phys_addr_t phys);
extern void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr);
extern int ioremap_change_attr(unsigned long vaddr, unsigned long size,
unsigned long prot_val);

4
arch/x86/mm/ioremap.c
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@ -327,7 +327,7 @@ EXPORT_SYMBOL(iounmap);
* Convert a physical pointer to a virtual kernel pointer for /dev/mem
* access
*/
void *xlate_dev_mem_ptr(unsigned long phys)
void *xlate_dev_mem_ptr(phys_addr_t phys)
{
void *addr;
unsigned long start = phys & PAGE_MASK;
@ -343,7 +343,7 @@ void *xlate_dev_mem_ptr(unsigned long phys)
return addr;
}
void unxlate_dev_mem_ptr(unsigned long phys, void *addr)
void unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
{
if (page_is_ram(phys >> PAGE_SHIFT))
return;

13
drivers/char/mem.c
View File

@ -84,9 +84,12 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
}
#endif
void __weak unxlate_dev_mem_ptr(unsigned long phys, void *addr)
#ifndef unxlate_dev_mem_ptr
#define unxlate_dev_mem_ptr unxlate_dev_mem_ptr
void __weak unxlate_dev_mem_ptr(phys_addr_t phys, void *addr)
{
}
#endif
/*
* This funcion reads the *physical* memory. The f_pos points directly to the
@ -97,7 +100,7 @@ static ssize_t read_mem(struct file *file, char __user *buf,
{
phys_addr_t p = *ppos;
ssize_t read, sz;
char *ptr;
void *ptr;
if (p != *ppos)
return 0;
@ -400,7 +403,7 @@ static ssize_t read_kmem(struct file *file, char __user *buf,
* uncached, then it must also be accessed uncached
* by the kernel or data corruption may occur
*/
kbuf = xlate_dev_kmem_ptr((char *)p);
kbuf = xlate_dev_kmem_ptr((void *)p);
if (copy_to_user(buf, kbuf, sz))
return -EFAULT;
@ -461,7 +464,7 @@ static ssize_t do_write_kmem(unsigned long p, const char __user *buf,
#endif
while (count > 0) {
char *ptr;
void *ptr;
sz = size_inside_page(p, count);
@ -470,7 +473,7 @@ static ssize_t do_write_kmem(unsigned long p, const char __user *buf,
* it must also be accessed uncached by the kernel or data
* corruption may occur.
*/
ptr = xlate_dev_kmem_ptr((char *)p);
ptr = xlate_dev_kmem_ptr((void *)p);
copied = copy_from_user(ptr, buf, sz);
if (copied) {