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firewire: net: fix memory leaks 

a) fwnet_transmit_packet_done used to poison ptask->pt_link by list_del.
If fwnet_send_packet checked later whether it was responsible to clean
up (in the border case that the TX soft IRQ was outpaced by the AT-req
tasklet on another CPU), it missed this because ptask->pt_link was no
longer shown as empty.

b) If fwnet_write_complete got an rcode other than RCODE_COMPLETE, we
missed to free the skb and ptask entirely.

Also, count stats.tx_dropped and stats.tx_errors when rcode != 0.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2010-11-06 16:57:28 +01:00
parent 902bca00dc
commit 7ee11fa8d0
1 changed files with 31 additions and 4 deletions
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35
drivers/firewire/net.c
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@ -916,9 +916,10 @@ static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
/* Check whether we or the networking TX soft-IRQ is last user. */
free = (ptask->outstanding_pkts == 0 && !list_empty(&ptask->pt_link));
if (free)
list_del(&ptask->pt_link);
if (ptask->outstanding_pkts == 0) {
list_del(&ptask->pt_link);
dev->netdev->stats.tx_packets++;
dev->netdev->stats.tx_bytes += skb->len;
}
@ -973,6 +974,31 @@ static void fwnet_transmit_packet_done(struct fwnet_packet_task *ptask)
fwnet_free_ptask(ptask);
}
static void fwnet_transmit_packet_failed(struct fwnet_packet_task *ptask)
{
struct fwnet_device *dev = ptask->dev;
unsigned long flags;
bool free;
spin_lock_irqsave(&dev->lock, flags);
/* One fragment failed; don't try to send remaining fragments. */
ptask->outstanding_pkts = 0;
/* Check whether we or the networking TX soft-IRQ is last user. */
free = !list_empty(&ptask->pt_link);
if (free)
list_del(&ptask->pt_link);
dev->netdev->stats.tx_dropped++;
dev->netdev->stats.tx_errors++;
spin_unlock_irqrestore(&dev->lock, flags);
if (free)
fwnet_free_ptask(ptask);
}
static void fwnet_write_complete(struct fw_card *card, int rcode,
void *payload, size_t length, void *data)
{
@ -980,11 +1006,12 @@ static void fwnet_write_complete(struct fw_card *card, int rcode,
ptask = data;
if (rcode == RCODE_COMPLETE)
if (rcode == RCODE_COMPLETE) {
fwnet_transmit_packet_done(ptask);
else
} else {
fw_error("fwnet_write_complete: failed: %x\n", rcode);
/* ??? error recovery */
fwnet_transmit_packet_failed(ptask);
}
}
static int fwnet_send_packet(struct fwnet_packet_task *ptask)