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| author | Axel Lin <axel.lin@ingics.com> | 2013-07-05 17:13:12 +0800 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2013-07-05 11:39:25 +0200 |
| commit | 002fca5df168922103a2bb52748f9984e6de80b2 (patch) | |
| tree | 9742e650398d3f48d8cf2ebfe8868c14c778a44a /kernel/irq | |
| parent | 5b8aae489a07ac7d5a2cb897d6ca1fddb0c0043a (diff) | |
| download | linux-002fca5df168922103a2bb52748f9984e6de80b2.tar.bz2 | |
genirq: generic chip: Use DIV_ROUND_UP to calculate numchips
The number of interrupts in a domain may be not divisible by the
number of interrupts each chip handles. Integer division may truncate
the result, thus use DIV_ROUND_UP to count numchips.
Seems all users of irq_alloc_domain_generic_chips() in current code do
not have this issue. I just found the issue while reading the code.
Signed-off-by: Axel Lin <axel.lin@ingics.com>
Cc: Grant Likely <grant.likely@linaro.org>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Link: http://lkml.kernel.org/r/1373015592.18252.2.camel@phoenix
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/irq')
| -rw-r--r-- | kernel/irq/generic-chip.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/irq/generic-chip.c b/kernel/irq/generic-chip.c index 1c39eccc1eaf..2f274f30b7e2 100644 --- a/kernel/irq/generic-chip.c +++ b/kernel/irq/generic-chip.c @@ -278,7 +278,7 @@ int irq_alloc_domain_generic_chips(struct irq_domain *d, int irqs_per_chip, if (d->revmap_type != IRQ_DOMAIN_MAP_LINEAR) return -EINVAL; - numchips = d->revmap_data.linear.size / irqs_per_chip; + numchips = DIV_ROUND_UP(d->revmap_data.linear.size, irqs_per_chip); if (!numchips) return -EINVAL; |