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 <[email protected]>
arch/powerpc/mm/pgtable_64.c | 4 ++++
1 file changed, 4 insertions(+)
Index: linux-cell/arch/powerpc/mm/pgtable_64.c
===================================================================
--- linux-cell.orig/arch/powerpc/mm/pgtable_64.c 2007-05-15 13:17:59.000000000 +1000
+++ linux-cell/arch/powerpc/mm/pgtable_64.c 2007-05-15 13:18:32.000000000 +1000
@@ -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(unsig
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;
}
-
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