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[POWERPC] Add spinlock to request_phb_iospace()

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request_phb_iospace() can be called from different CPUs at init
time (at least with my next patch) and thus needs a spinlock.
As for the next patch, this is a temporary workaround for 2.6.22
issues until my rewrite of IO mappings is ready (for 2.6.23)

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Benjamin Herrenschmidt 2007-05-15 14:16:26 +10:00 committed by Paul Mackerras
parent 6a32d085ae
commit 017e3c53f1
1 changed files with 4 additions and 0 deletions
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4
arch/powerpc/mm/pgtable_64.c
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@ -322,6 +322,8 @@ EXPORT_SYMBOL(__ioremap);
EXPORT_SYMBOL(iounmap);
EXPORT_SYMBOL(__iounmap);
static DEFINE_SPINLOCK(phb_io_lock);
void __iomem * reserve_phb_iospace(unsigned long size)
{
void __iomem *virt_addr;
@ -329,8 +331,10 @@ void __iomem * reserve_phb_iospace(unsigned long size)
if (phbs_io_bot >= IMALLOC_BASE)
panic("reserve_phb_iospace(): phb io space overflow\n");
spin_lock(&phb_io_lock);
virt_addr = (void __iomem *) phbs_io_bot;
phbs_io_bot += size;
spin_unlock(&phb_io_lock);
return virt_addr;
}