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can bcm: fix tx_setup off-by-one errors 

This patch fixes two off-by-one errors that canceled each other out.
Checking for the same condition two times in bcm_tx_timeout_tsklet() reduced
the count of frames to be sent by one. This did not show up the first time
tx_setup is invoked as an additional frame is sent due to TX_ANNONCE.
Invoking a second tx_setup on the same item led to a reduced (by 1) number of
sent frames.

Reported-by: Andre Naujoks <nautsch@gmail.com>
Signed-off-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Oliver Hartkopp 2011-09-23 08:23:47 +00:00 committed by David S. Miller
parent d3c52173be
commit aabdcb0b55
1 changed files with 7 additions and 6 deletions
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13
net/can/bcm.c
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@ -365,9 +365,6 @@ static void bcm_tx_timeout_tsklet(unsigned long data)
bcm_send_to_user(op, &msg_head, NULL, 0);
}
}
if (op->kt_ival1.tv64 && (op->count > 0)) {
/* send (next) frame */
bcm_can_tx(op);
@ -970,8 +967,9 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
/* spec: send can_frame when starting timer */
op->flags |= TX_ANNOUNCE;
if (op->kt_ival1.tv64 && (op->count > 0)) {
/* op->count-- is done in bcm_tx_timeout_handler */
/* 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
@ -979,8 +977,11 @@ static int bcm_tx_setup(struct bcm_msg_head *msg_head, struct msghdr *msg,
HRTIMER_MODE_REL);
}
if (op->flags & TX_ANNOUNCE)
if (op->flags & TX_ANNOUNCE) {
bcm_can_tx(op);
if (op->kt_ival1.tv64 && (op->count > 0))
op->count--;
}
return msg_head->nframes * CFSIZ + MHSIZ;
}