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The PPS_MAX_SOURCES value is currently set to 16. In some cases this was not sufficient for a system. For example, a system with multiple (4+) PCIe cards each with 4 PTP-capable ethernet interfaces could run out of the available PPS major:minors if each interface registers a PPS source. Signed-off-by: Charlie Johnston --- include/uapi/linux/pps.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/uapi/linux/pps.h b/include/uapi/linux/pps.h index 009ebcd8ced5..85f472330da8 100644 --- a/include/uapi/linux/pps.h +++ b/include/uapi/linux/pps.h @@ -26,7 +26,7 @@ #include #define PPS_VERSION "5.3.6" -#define PPS_MAX_SOURCES 16 /* should be enough... */ +#define PPS_MAX_SOURCES (MINORMASK + 1) /* Implementation note: the logical states ``assert'' and ``clear'' * are implemented in terms of the chip register, i.e. ``assert''