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agp/uninorth: Fix oops caused by flushing too much 

This fixes a sporadic oops at boot on G5 Power Macs.  The table_end
variable has the address of the last byte of the table.  Adding on
PAGE_SIZE means we flush too much, and if the page after the table
is not mapped for any reason, the kernel will oops.  Instead we add
on 1 because flush_dcache_range() interprets its second argument as
the first byte past the range to be flushed.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Paul Mackerras 2010-06-01 19:33:08 +00:00 committed by Benjamin Herrenschmidt
parent 92e197095e
commit 79905ad50b
1 changed files with 1 additions and 1 deletions
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2
drivers/char/agp/uninorth-agp.c
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@ -415,7 +415,7 @@ static int uninorth_create_gatt_table(struct agp_bridge_data *bridge)
bridge->gatt_table_real = (u32 *) table; bridge->gatt_table_real = (u32 *) table;
/* Need to clear out any dirty data still sitting in caches */ /* Need to clear out any dirty data still sitting in caches */
flush_dcache_range((unsigned long)table, flush_dcache_range((unsigned long)table,
(unsigned long)(table_end + PAGE_SIZE)); (unsigned long)table_end + 1);
bridge->gatt_table = vmap(pages, (1 << page_order), 0, PAGE_KERNEL_NCG); bridge->gatt_table = vmap(pages, (1 << page_order), 0, PAGE_KERNEL_NCG);
if (bridge->gatt_table == NULL) if (bridge->gatt_table == NULL)