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add requests pending/submit count to prevent request queue full condition by preempting h/w overflow interrupts in software. We do this due to the delay in the delivery and handling of the channel overflow error interrupt. Signed-off-by: Kim Phillips <kim.phillips@freescale.com> Acked-by: Lee Nipper <lee.nipper@freescale.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>