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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-05-15 14:16:26 +1000
committerPaul Mackerras <paulus@samba.org>2007-05-17 21:11:14 +1000
commit017e3c53f116d6a0741a21624924528dc9f98418 (patch)
treec9e378349c82d6697c443dfbf62a142a9162d353 /arch/powerpc/mm/pgtable_64.c
parent6a32d085ae71724edffa30fcd2045520a051cb14 (diff)
[POWERPC] Add spinlock to request_phb_iospace()
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>
Diffstat (limited to 'arch/powerpc/mm/pgtable_64.c')
-rw-r--r--arch/powerpc/mm/pgtable_64.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/mm/pgtable_64.c b/arch/powerpc/mm/pgtable_64.c
index 1d443407423..ad6e135bf21 100644
--- a/arch/powerpc/mm/pgtable_64.c
+++ b/arch/powerpc/mm/pgtable_64.c
@@ -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;
}