[Xen-devel] [PATCH v4 37/53] xen/drivers/passthrough/vtd/quirks.c: let custom parameter parsing routines return errno

[Juergen Gross <jgross@xxxxxxxx>]

Modify the custom parameter parsing routines in:

xen/drivers/passthrough/vtd/quirks.c

to indicate whether the parameter value was parsed successfully.

Cc: Kevin Tian <kevin.tian@xxxxxxxxx>
Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Acked-by: Wei Liu <wei.liu2@xxxxxxxxxx>
---
 xen/drivers/passthrough/vtd/quirks.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/xen/drivers/passthrough/vtd/quirks.c 
b/xen/drivers/passthrough/vtd/quirks.c
index d6dd671dbf..d6db862678 100644
--- a/xen/drivers/passthrough/vtd/quirks.c
+++ b/xen/drivers/passthrough/vtd/quirks.c
@@ -247,9 +247,10 @@ void vtd_ops_postamble_quirk(struct iommu* iommu)
     }
 }
 
-static void __init parse_snb_timeout(const char *s)
+static int __init parse_snb_timeout(const char *s)
 {
     int t;
+    const char *q = NULL;
 
     t = parse_bool(s, NULL);
     if ( t < 0 )
@@ -259,13 +260,13 @@ static void __init parse_snb_timeout(const char *s)
         else if ( strcmp(s, "cap") == 0 )
             t = SNB_IGD_TIMEOUT;
         else
-            t = strtoul(s, NULL, 0);
+            t = strtoul(s, &q, 0);
     }
     else
         t = t ? SNB_IGD_TIMEOUT_LEGACY : 0;
     snb_igd_timeout = MILLISECS(t);
 
-    return;
+    return (q && *q) ? -EINVAL : 0;
 }
 custom_param("snb_igd_quirk", parse_snb_timeout);
 
-- 
2.12.3


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