From 124c39371114f43df34882685db3682a91dea10c Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Tue, 21 Jun 2016 10:57:59 +0300 Subject: xhci: use boolean to indicate last trb in td remainder calculation We only need to know if we are queuing the last trb for a TD when calculating the td remainder field. The total number of trbs left is not used. We won't be able to trust the pre-calculated number of trbs used if we need to align trb data by splitting or merging trbs in order to satisfy comply with data alignment requirements in xhci specs section 4.11.7.1. Signed-off-by: Mathias Nyman Signed-off-by: Greg Kroah-Hartman --- drivers/usb/host/xhci-ring.c | 13 ++++++------- 1 file changed, 6 insertions(+), 7 deletions(-) (limited to 'drivers/usb/host/xhci-ring.c') diff --git a/drivers/usb/host/xhci-ring.c b/drivers/usb/host/xhci-ring.c index 71cae792f489..4637da6af765 100644 --- a/drivers/usb/host/xhci-ring.c +++ b/drivers/usb/host/xhci-ring.c @@ -3092,7 +3092,7 @@ int xhci_queue_intr_tx(struct xhci_hcd *xhci, gfp_t mem_flags, */ static u32 xhci_td_remainder(struct xhci_hcd *xhci, int transferred, int trb_buff_len, unsigned int td_total_len, - struct urb *urb, unsigned int num_trbs_left) + struct urb *urb, bool more_trbs_coming) { u32 maxp, total_packet_count; @@ -3101,7 +3101,7 @@ static u32 xhci_td_remainder(struct xhci_hcd *xhci, int transferred, return ((td_total_len - transferred) >> 10); /* One TRB with a zero-length data packet. */ - if (num_trbs_left == 0 || (transferred == 0 && trb_buff_len == 0) || + if (!more_trbs_coming || (transferred == 0 && trb_buff_len == 0) || trb_buff_len == td_total_len) return 0; @@ -3216,7 +3216,7 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, field |= TRB_CHAIN; } else { field |= TRB_IOC; - more_trbs_coming = need_zero_pkt; + more_trbs_coming = false; td->last_trb = ring->enqueue; } @@ -3227,13 +3227,12 @@ int xhci_queue_bulk_tx(struct xhci_hcd *xhci, gfp_t mem_flags, /* Set the TRB length, TD size, and interrupter fields. */ remainder = xhci_td_remainder(xhci, running_total, trb_buff_len, full_len, - urb, num_trbs - i - 1); - + urb, more_trbs_coming); length_field = TRB_LEN(trb_buff_len) | TRB_TD_SIZE(remainder) | TRB_INTR_TARGET(0); - queue_trb(xhci, ring, more_trbs_coming, + queue_trb(xhci, ring, more_trbs_coming | need_zero_pkt, lower_32_bits(addr), upper_32_bits(addr), length_field, @@ -3657,7 +3656,7 @@ static int xhci_queue_isoc_tx(struct xhci_hcd *xhci, gfp_t mem_flags, /* Set the TRB length, TD size, & interrupter fields. */ remainder = xhci_td_remainder(xhci, running_total, trb_buff_len, td_len, - urb, trbs_per_td - j - 1); + urb, more_trbs_coming); length_field = TRB_LEN(trb_buff_len) | TRB_INTR_TARGET(0); -- cgit v1.2.3