Question on EHCI INTR_MASK

I saw the definition of INTR_MASK,drivers/usb/host/ehci-hcd.c,

#define	INTR_MASK (STS_IAA | STS_FATAL | STS_PCD | STS_ERR | STS_INT)

But I remember there are 6 bits, say, the frame list rollover bit,

#define STS_FLR		(1<<3)		/* frame list rolled over */

Why do we just ignore this one?All of these 6 bits are interrupt status bits.

Regards
Jason

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