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Commit e3ce0c94 authored by Will Deacon's avatar Will Deacon Committed by Joerg Roedel
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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: default avatarWill Deacon <will.deacon@arm.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 661d962f

drivers/iommu/arm-smmu.c

+1 −1
Original line number Diff line number Diff line
@@ -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.");