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caif: Fix freezes when running CAIF loopback device 

Fix spinlock bugs when running out of link-ids in loopback tests and
avoid allocating link-id when error is set in link-setup-response.

Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
sjur.brandeland@stericsson.com 2011-05-22 11:18:52 +00:00 committed by David S. Miller
parent 54e90fb5ca
commit 96796ea8b6
1 changed files with 5 additions and 4 deletions
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9
net/caif/cfctrl.c
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@ -368,7 +368,8 @@ static int cfctrl_recv(struct cflayer *layer, struct cfpkt *pkt)
cfpkt_extr_head(pkt, &cmdrsp, 1);
cmd = cmdrsp & CFCTRL_CMD_MASK;
if (cmd != CFCTRL_CMD_LINK_ERR
&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)) {
&& CFCTRL_RSP_BIT != (CFCTRL_RSP_BIT & cmdrsp)
&& CFCTRL_ERR_BIT != (CFCTRL_ERR_BIT & cmdrsp)) {
if (handle_loop(cfctrl, cmd, pkt) != 0)
cmdrsp |= CFCTRL_ERR_BIT;
}
@ -604,16 +605,16 @@ static int handle_loop(struct cfctrl *ctrl, int cmd, struct cfpkt *pkt)
case CFCTRL_CMD_LINK_SETUP:
spin_lock_bh(&ctrl->loop_linkid_lock);
if (!dec) {
for (linkid = last_linkid + 1; linkid < 255; linkid++)
for (linkid = last_linkid + 1; linkid < 254; linkid++)
if (!ctrl->loop_linkused[linkid])
goto found;
}
dec = 1;
for (linkid = last_linkid - 1; linkid > 0; linkid--)
for (linkid = last_linkid - 1; linkid > 1; linkid--)
if (!ctrl->loop_linkused[linkid])
goto found;
spin_unlock_bh(&ctrl->loop_linkid_lock);
return -1;
found:
if (linkid < 10)
dec = 0;