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| author | Jarek Poplawski <jarkao2@gmail.com> | 2008-02-13 11:17:58 +0000 |
|---|---|---|
| committer | Jeff Garzik <jeff@garzik.org> | 2008-02-15 10:51:51 -0500 |
| commit | 9f30c768c00fd0f0a2ab37ef29d8c8c5a7abdf2e (patch) | |
| tree | 21bc24feb0f220c372d30469a47ca640fba75368 /drivers/net/hamradio/mkiss.c | |
| parent | a1a98b72dbd17e53cd92b8e78f404525ebcfd981 (diff) | |
| download | linux-3.10-9f30c768c00fd0f0a2ab37ef29d8c8c5a7abdf2e.tar.gz linux-3.10-9f30c768c00fd0f0a2ab37ef29d8c8c5a7abdf2e.tar.bz2 linux-3.10-9f30c768c00fd0f0a2ab37ef29d8c8c5a7abdf2e.zip | |
mkiss: ax_bump() locking fix
According to one of OOPSes reported by Jann softirq can break
while skb is prepared for netif_rx. The report isn't complete,
so the real reason of the later bug could be different, but
IMHO this locking break in ax_bump is unsafe and unnecessary.
Reported-and-tested-by: Jann Traschewski <jann@gmx.de>
Signed-off-by: Jarek Poplawski <jarkao2@gmail.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
Diffstat (limited to 'drivers/net/hamradio/mkiss.c')
| -rw-r--r-- | drivers/net/hamradio/mkiss.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/drivers/net/hamradio/mkiss.c b/drivers/net/hamradio/mkiss.c index cfcd15af501..30c9b3b0d13 100644 --- a/drivers/net/hamradio/mkiss.c +++ b/drivers/net/hamradio/mkiss.c @@ -289,7 +289,6 @@ static void ax_bump(struct mkiss *ax) *ax->rbuff &= ~0x20; } } - spin_unlock_bh(&ax->buflock); count = ax->rcount; @@ -297,17 +296,17 @@ static void ax_bump(struct mkiss *ax) printk(KERN_ERR "mkiss: %s: memory squeeze, dropping packet.\n", ax->dev->name); ax->stats.rx_dropped++; + spin_unlock_bh(&ax->buflock); return; } - spin_lock_bh(&ax->buflock); memcpy(skb_put(skb,count), ax->rbuff, count); - spin_unlock_bh(&ax->buflock); skb->protocol = ax25_type_trans(skb, ax->dev); netif_rx(skb); ax->dev->last_rx = jiffies; ax->stats.rx_packets++; ax->stats.rx_bytes += count; + spin_unlock_bh(&ax->buflock); } static void kiss_unesc(struct mkiss *ax, unsigned char s) |