omap: iovmm: disallow mapping NULL address when IOVMF_DA_ANON is set
commit c7f4ab26e3bcdaeb3e19ec658e3ad9092f1a6ceb allowed mapping the NULL
address if da_start==0, which would then not get unmapped. Disallow
this again if IOVMF_DA_ANON is set. And spell variable 'alignment'
correctly.
Signed-off-by: Michael Jones <michael.jones@matrix-vision.de>
Signed-off-by: Tony Lindgren <tony@atomide.com>
diff --git a/arch/arm/plat-omap/iovmm.c b/arch/arm/plat-omap/iovmm.c
index 6dc1296..ea7eab9 100644
--- a/arch/arm/plat-omap/iovmm.c
+++ b/arch/arm/plat-omap/iovmm.c
@@ -271,20 +271,21 @@
size_t bytes, u32 flags)
{
struct iovm_struct *new, *tmp;
- u32 start, prev_end, alignement;
+ u32 start, prev_end, alignment;
if (!obj || !bytes)
return ERR_PTR(-EINVAL);
start = da;
- alignement = PAGE_SIZE;
+ alignment = PAGE_SIZE;
if (flags & IOVMF_DA_ANON) {
- start = obj->da_start;
+ /* Don't map address 0 */
+ start = obj->da_start ? obj->da_start : alignment;
if (flags & IOVMF_LINEAR)
- alignement = iopgsz_max(bytes);
- start = roundup(start, alignement);
+ alignment = iopgsz_max(bytes);
+ start = roundup(start, alignment);
} else if (start < obj->da_start || start > obj->da_end ||
obj->da_end - start < bytes) {
return ERR_PTR(-EINVAL);
@@ -304,7 +305,7 @@
goto found;
if (tmp->da_end >= start && flags & IOVMF_DA_ANON)
- start = roundup(tmp->da_end + 1, alignement);
+ start = roundup(tmp->da_end + 1, alignment);
prev_end = tmp->da_end;
}