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| author | Jon Hunter <jonathanh@nvidia.com> | 2016-05-10 16:14:38 +0100 |
|---|---|---|
| committer | Marc Zyngier <marc.zyngier@arm.com> | 2016-05-11 10:12:41 +0100 |
| commit | ec1a454d6136b93e26902ead21025efc08047d05 (patch) | |
| tree | 2ce8d140d751af0c76aba528e185d420ff98a67e /drivers/irqchip | |
| parent | a2a8fa5563d8740efaa8e62f653a6a85569c858b (diff) | |
| download | linux-ec1a454d6136b93e26902ead21025efc08047d05.tar.gz linux-ec1a454d6136b93e26902ead21025efc08047d05.tar.bz2 linux-ec1a454d6136b93e26902ead21025efc08047d05.zip | |
irqchip/gic: Don't unnecessarily write the IRQ configuration
If the interrupt configuration matches the current configuration, then
don't bother writing the configuration again.
Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-common.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/drivers/irqchip/irq-gic-common.c b/drivers/irqchip/irq-gic-common.c index f174ce0ca361..ffff5a45f1e3 100644 --- a/drivers/irqchip/irq-gic-common.c +++ b/drivers/irqchip/irq-gic-common.c @@ -50,13 +50,17 @@ int gic_configure_irq(unsigned int irq, unsigned int type, else if (type & IRQ_TYPE_EDGE_BOTH) val |= confmask; + /* If the current configuration is the same, then we are done */ + if (val == oldval) + return 0; + /* * Write back the new configuration, and possibly re-enable - * the interrupt. If we tried to write a new configuration and failed, + * the interrupt. If we fail to write a new configuration, * return an error. */ writel_relaxed(val, base + GIC_DIST_CONFIG + confoff); - if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val && val != oldval) + if (readl_relaxed(base + GIC_DIST_CONFIG + confoff) != val) ret = -EINVAL; if (sync_access) |