[xen staging] IOMMU: correct parsing of "quarantine=scratch-page"

[patchbot@xxxxxxx]

commit ec6e56359553e82fefa877fd221479847ffc93dd
Author:     Jan Beulich <jbeulich@xxxxxxxx>
AuthorDate: Tue Jul 13 10:16:18 2021 +0200
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Tue Jul 13 10:16:18 2021 +0200

    IOMMU: correct parsing of "quarantine=scratch-page"
    
    During the multiple renames of the sub-option I apparently forgot to
    update the left side of the &&, and this pretty consistently.
    
    Fixes: 980d6acf1517 ("IOMMU: make DMA containment of quarantined devices 
optional")
    Reported-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
    Reviewed-by: Paul Durrant <paul@xxxxxxx>
---
 xen/drivers/passthrough/iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/iommu.c b/xen/drivers/passthrough/iommu.c
index ab2ae61b11..fd2578d30a 100644
--- a/xen/drivers/passthrough/iommu.c
+++ b/xen/drivers/passthrough/iommu.c
@@ -82,7 +82,7 @@ static int __init parse_iommu_param(const char *s)
 #ifdef CONFIG_HAS_PCI
         else if ( (val = parse_boolean("quarantine", s, ss)) >= 0 )
             iommu_quarantine = val;
-        else if ( ss == s + 15 && !strncmp(s, "quarantine=scratch-page", 23) )
+        else if ( ss == s + 23 && !strncmp(s, "quarantine=scratch-page", 23) )
             iommu_quarantine = IOMMU_quarantine_scratch_page;
 #endif
 #ifdef CONFIG_X86
--
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