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[ARM] Orion: fix ioremap() optimization 

The ioremap() optimization used for internal register didn't cope
with the fact that paddr + size can wrap to zero if the area extends
to the end of the physical address space.

Issue isolated by Sylver Bruneau <sylver.bruneau@googlemail.com>.

Signed-off-by: Nicolas Pitre <nico@marvell.com>
This commit is contained in:
Nicolas Pitre 2008-04-25 14:28:55 -04:00
parent c5a1e8f709
commit fd153abb01
1 changed files with 4 additions and 5 deletions
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9
include/asm-arm/arch-orion5x/io.h
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@ -20,11 +20,10 @@ static inline void __iomem *
__arch_ioremap(unsigned long paddr, size_t size, unsigned int mtype)
{
void __iomem *retval;
if (mtype == MT_DEVICE && size && paddr >= ORION5X_REGS_PHYS_BASE &&
paddr + size <= ORION5X_REGS_PHYS_BASE + ORION5X_REGS_SIZE) {
retval = (void __iomem *)ORION5X_REGS_VIRT_BASE +
(paddr - ORION5X_REGS_PHYS_BASE);
unsigned long offs = paddr - ORION5X_REGS_PHYS_BASE;
if (mtype == MT_DEVICE && size && offs < ORION5X_REGS_SIZE &&
size <= ORION5X_REGS_SIZE && offs + size <= ORION5X_REGS_SIZE) {
retval = (void __iomem *)ORION5X_REGS_VIRT_BASE + offs;
} else {
retval = __arm_ioremap(paddr, size, mtype);
}