The list of open vccs is modified by open/close, and traversed by the
receive tasklet. This is the last race I know of in this driver.
speedtch.c | 20 ++++++++++++++++++--
1 files changed, 18 insertions(+), 2 deletions(-)
diff -Nru a/drivers/usb/misc/speedtch.c b/drivers/usb/misc/speedtch.c
--- a/drivers/usb/misc/speedtch.c Tue Mar 25 10:27:35 2003
+++ b/drivers/usb/misc/speedtch.c Tue Mar 25 10:27:35 2003
@@ -933,11 +933,17 @@
if (vcc->qos.aal != ATM_AAL5)
return -EINVAL;
- if (udsl_find_vcc (instance, vpi, vci))
+ down (&instance->serialize); /* vs self, udsl_atm_close */
+
+ if (udsl_find_vcc (instance, vpi, vci)) {
+ up (&instance->serialize);
return -EADDRINUSE;
+ }
- if (!(new = kmalloc (sizeof (struct udsl_vcc_data), GFP_KERNEL)))
+ if (!(new = kmalloc (sizeof (struct udsl_vcc_data), GFP_KERNEL))) {
+ up (&instance->serialize);
return -ENOMEM;
+ }
memset (new, 0, sizeof (struct udsl_vcc_data));
new->vcc = vcc;
@@ -949,12 +955,16 @@
vcc->vpi = vpi;
vcc->vci = vci;
+ tasklet_disable (&instance->receive_tasklet);
list_add (&new->list, &instance->vcc_list);
+ tasklet_enable (&instance->receive_tasklet);
set_bit (ATM_VF_ADDR, &vcc->flags);
set_bit (ATM_VF_PARTIAL, &vcc->flags);
set_bit (ATM_VF_READY, &vcc->flags);
+ up (&instance->serialize);
+
dbg ("Allocated new SARLib vcc 0x%p with vpi %d vci %d", new, vpi, vci);
MOD_INC_USE_COUNT;
@@ -983,7 +993,11 @@
udsl_cancel_send (instance, vcc);
+ down (&instance->serialize); /* vs self, udsl_atm_open */
+
+ tasklet_disable (&instance->receive_tasklet);
list_del (&vcc_data->list);
+ tasklet_enable (&instance->receive_tasklet);
if (vcc_data->reasBuffer)
kfree_skb (vcc_data->reasBuffer);
@@ -997,6 +1011,8 @@
clear_bit (ATM_VF_READY, &vcc->flags);
clear_bit (ATM_VF_PARTIAL, &vcc->flags);
clear_bit (ATM_VF_ADDR, &vcc->flags);
+
+ up (&instance->serialize);
MOD_DEC_USE_COUNT;
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