From: Tvrtko Ursulin tvrtko.ursulin@intel.com
[ Upstream commit 5240aed2cd2594fb392239f11b9681e5e1591619 ]
Handling of intel_iommu kernel command line option should return "true" to indicate option is valid and so avoid logging it as unknown by the core parsing code.
Also log unknown sub-options at the notice level to let user know of potential typos or similar.
Reported-by: Eero Tamminen eero.t.tamminen@intel.com Signed-off-by: Tvrtko Ursulin tvrtko.ursulin@intel.com Link: https://lore.kernel.org/r/20210831112947.310080-1-tvrtko.ursulin@linux.intel... Signed-off-by: Lu Baolu baolu.lu@linux.intel.com Link: https://lore.kernel.org/r/20211014053839.727419-2-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/intel/iommu.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c index dd22fc7d51764..663ef69769f2b 100644 --- a/drivers/iommu/intel/iommu.c +++ b/drivers/iommu/intel/iommu.c @@ -439,6 +439,7 @@ static int __init intel_iommu_setup(char *str) { if (!str) return -EINVAL; + while (*str) { if (!strncmp(str, "on", 2)) { dmar_disabled = 0; @@ -465,13 +466,16 @@ static int __init intel_iommu_setup(char *str) } else if (!strncmp(str, "tboot_noforce", 13)) { pr_info("Intel-IOMMU: not forcing on after tboot. This could expose security risk for tboot\n"); intel_iommu_tboot_noforce = 1; + } else { + pr_notice("Unknown option - '%s'\n", str); }
str += strcspn(str, ","); while (*str == ',') str++; } - return 0; + + return 1; } __setup("intel_iommu=", intel_iommu_setup);