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authorOliver Hartkopp <socketcan@hartkopp.net>2011-09-29 15:33:47 -0400
committerDavid S. Miller <davem@davemloft.net>2011-09-29 15:33:47 -0400
commit12d0d0d3a7349daa95dbfd5d7df8146255bc7c67 (patch)
tree8dde0268c6afdb71142d59c9090b7d9abe88e222
parent85a64889492b45f931ddac87ec09d84aa7347ee1 (diff)
downloadlinux-3.0-android-ux500-12d0d0d3a7349daa95dbfd5d7df8146255bc7c67.tar.gz
can bcm: fix incomplete tx_setup fix
The commit aabdcb0b553b9c9547b1a506b34d55a764745870 ("can bcm: fix tx_setup off-by-one errors") fixed only a part of the original problem reported by Andre Naujoks. It turned out that the original code needed to be re-ordered to reduce complexity and to finally fix the reported frame counting issues. Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--net/can/bcm.c48
1 files changed, 21 insertions, 27 deletions
diff --git a/net/can/bcm.c b/net/can/bcm.c
index c9cdb8d78e7..c84963d2dee 100644
--- a/net/can/bcm.c
+++ b/net/can/bcm.c
@@ -344,6 +344,18 @@ static void bcm_send_to_user(struct bcm_op *op, struct bcm_msg_head *head,
}
}
+static void bcm_tx_start_timer(struct bcm_op *op)
+{
+ if (op->kt_ival1.tv64 && op->count)
+ hrtimer_start(&op->timer,
+ ktime_add(ktime_get(), op->kt_ival1),
+ HRTIMER_MODE_ABS);
+ else if (op->kt_ival2.tv64)
+ hrtimer_start(&op->timer,
+ ktime_add(ktime_get(), op->kt_ival2),
+ HRTIMER_MODE_ABS);
+}
+
static void bcm_tx_timeout_tsklet(unsigned long data)
{
struct bcm_op *op = (struct bcm_op *)data;
@@ -365,23 +377,12 @@ static void bcm_tx_timeout_tsklet(unsigned long data)
bcm_send_to_user(op, &msg_head, NULL, 0);
}
-
- /* send (next) frame */
bcm_can_tx(op);
- hrtimer_start(&op->timer,
- ktime_add(ktime_get(), op->kt_ival1),
- HRTIMER_MODE_ABS);
- } else {
- if (op->kt_ival2.tv64) {
+ } else if (op->kt_ival2.tv64)
+ bcm_can_tx(op);
- /* send (next) frame */
- bcm_can_tx(op);
- hrtimer_start(&op->timer,
- ktime_add(ktime_get(), op->kt_ival2),
- HRTIMER_MODE_ABS);
- }
- }
+ bcm_tx_start_timer(op);
}
/*
@@ -961,28 +962,21 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
hrtimer_cancel(&op->timer);
}
- if ((op->flags & STARTTIMER) &&
- ((op->kt_ival1.tv64 && op->count) || op->kt_ival2.tv64)) {
-
+ if (op->flags & STARTTIMER) {
+ hrtimer_cancel(&op->timer);
/* spec: send can_frame when starting timer */
op->flags |= TX_ANNOUNCE;
-
- /* only start timer when having more frames than sent below */
- if (op->kt_ival1.tv64 && (op->count > 1)) {
- /* op->count-- is done in bcm_tx_timeout_tsklet */
- hrtimer_start(&op->timer, op->kt_ival1,
- HRTIMER_MODE_REL);
- } else
- hrtimer_start(&op->timer, op->kt_ival2,
- HRTIMER_MODE_REL);
}
if (op->flags & TX_ANNOUNCE) {
bcm_can_tx(op);
- if (op->kt_ival1.tv64 && (op->count > 0))
+ if (op->count)
op->count--;
}
+ if (op->flags & STARTTIMER)
+ bcm_tx_start_timer(op);
+
return msg_head->nframes * CFSIZ + MHSIZ;
}