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irqchip/gicv3-its: ITS table size should not be smaller than PSZ

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When allocating a device table, if the requested allocation is smaller
than the default granule size of the ITS then, we need to round up to
the default size.

Signed-off-by: Minghuan Lian <[email protected]>
[ stuart: Added comments and massaged changelog ]
Signed-off-by: Stuart Yoder <[email protected]>
Reviewed-by: Marc Zygnier <[email protected]>
Cc: <[email protected]>
Cc: <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Thomas Gleixner <[email protected]>
This commit is contained in:
Minghuan Lian 2015-05-20 10:13:15 -05:00 • committed by Thomas Gleixner
commit 3ad2a5f576
1 changed files with 8 additions and 1 deletions
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9
drivers/irqchip/irq-gic-v3-its.c
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@ -828,7 +828,14 @@ static int its_alloc_tables(struct its_node *its)
u64 typer = readq_relaxed(its->base + GITS_TYPER);
u32 ids = GITS_TYPER_DEVBITS(typer);
order = get_order((1UL << ids) * entry_size);
/*
* 'order' was initialized earlier to the default page
* granule of the the ITS. We can't have an allocation
* smaller than that. If the requested allocation
* is smaller, round up to the default page granule.
*/
order = max(get_order((1UL << ids) * entry_size),
order);
if (order >= MAX_ORDER) {
order = MAX_ORDER - 1;
pr_warn("%s: Device Table too large, reduce its page order to %u\n",