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authorBjorn Helgaas <bjorn.helgaas@hp.com>2006-03-26 11:37:05 +0200
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-26 18:56:54 +0200
commit136939a2b5aa4302281215745ccd567e1df2e8d4 (patch)
tree384841deada5b0ceb44c255e0474866bbc8d3354 /drivers/char/mem.c
parent[PATCH] ia64: use i386 dmi_scan.c (diff)
downloadlinux-136939a2b5aa4302281215745ccd567e1df2e8d4.tar.xz
linux-136939a2b5aa4302281215745ccd567e1df2e8d4.zip
[PATCH] EFI, /dev/mem: simplify efi_mem_attribute_range()
Pass the size, not a pointer to the size, to efi_mem_attribute_range(). This function validates memory regions for the /dev/mem read/write/mmap paths. The pointer allows arches to reduce the size of the range, but I think that's unnecessary complexity. Simplifying it will let me use efi_mem_attribute_range() to improve the ia64 ioremap() implementation. Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com> Cc: Matt Domsch <Matt_Domsch@dell.com> Cc: "Tolentino, Matthew E" <matthew.e.tolentino@intel.com> Cc: "Brown, Len" <len.brown@intel.com> Cc: Andi Kleen <ak@muc.de> Acked-by: "Luck, Tony" <tony.luck@intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/char/mem.c')
-rw-r--r--drivers/char/mem.c18
1 files changed, 6 insertions, 12 deletions
diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 26d0116b48d4..5245ba1649ed 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -88,21 +88,15 @@ static inline int uncached_access(struct file *file, unsigned long addr)
}
#ifndef ARCH_HAS_VALID_PHYS_ADDR_RANGE
-static inline int valid_phys_addr_range(unsigned long addr, size_t *count)
+static inline int valid_phys_addr_range(unsigned long addr, size_t count)
{
- unsigned long end_mem;
-
- end_mem = __pa(high_memory);
- if (addr >= end_mem)
+ if (addr + count > __pa(high_memory))
return 0;
- if (*count > end_mem - addr)
- *count = end_mem - addr;
-
return 1;
}
-static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t *size)
+static inline int valid_mmap_phys_addr_range(unsigned long addr, size_t size)
{
return 1;
}
@@ -119,7 +113,7 @@ static ssize_t read_mem(struct file * file, char __user * buf,
ssize_t read, sz;
char *ptr;
- if (!valid_phys_addr_range(p, &count))
+ if (!valid_phys_addr_range(p, count))
return -EFAULT;
read = 0;
#ifdef __ARCH_HAS_NO_PAGE_ZERO_MAPPED
@@ -177,7 +171,7 @@ static ssize_t write_mem(struct file * file, const char __user * buf,
unsigned long copied;
void *ptr;
- if (!valid_phys_addr_range(p, &count))
+ if (!valid_phys_addr_range(p, count))
return -EFAULT;
written = 0;
@@ -249,7 +243,7 @@ static int mmap_mem(struct file * file, struct vm_area_struct * vma)
{
size_t size = vma->vm_end - vma->vm_start;
- if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, &size))
+ if (!valid_mmap_phys_addr_range(vma->vm_pgoff << PAGE_SHIFT, size))
return -EINVAL;
vma->vm_page_prot = phys_mem_access_prot(file, vma->vm_pgoff,