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iommu/arm-smmu: Make force_stage module param read-only in sysfs 

Changing force_stage dynamically isn't supported by the driver and it
also doesn't make a whole lot of sense to change it once the SMMU is up
and running.

This patch makes the sysfs entry for the parameter read-only.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Will Deacon 2015-05-27 17:09:35 +01:00 committed by Joerg Roedel
parent 661d962f19
commit e3ce0c940e
1 changed files with 1 additions and 1 deletions
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2
drivers/iommu/arm-smmu.c
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@ -246,7 +246,7 @@
#define FSYNR0_WNR (1 << 4)
static int force_stage;
module_param_named(force_stage, force_stage, int, S_IRUGO | S_IWUSR);
module_param_named(force_stage, force_stage, int, S_IRUGO);
MODULE_PARM_DESC(force_stage,
"Force SMMU mappings to be installed at a particular stage of translation. A value of '1' or '2' forces the corresponding stage. All other values are ignored (i.e. no stage is forced). Note that selecting a specific stage will disable support for nested translation.");