iucv: provide second per-cpu IUCV command parameter block
Some of the IUCV commands can be invoked in interrupt context.
Those commands need a different per-cpu IUCV command parameter block,
otherwise they might overwrite an IUCV command parameter of a not yet
finished IUCV command invocation in process context.
Signed-off-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/iucv/iucv.c b/net/iucv/iucv.c
index a35240f..fcf4040 100644
--- a/net/iucv/iucv.c
+++ b/net/iucv/iucv.c
@@ -280,6 +280,7 @@
* Anchor for per-cpu IUCV command parameter block.
*/
static union iucv_param *iucv_param[NR_CPUS];
+static union iucv_param *iucv_param_irq[NR_CPUS];
/**
* iucv_call_b2f0
@@ -358,7 +359,7 @@
* 0x10 - Flag to allow priority message completion interrupts
* 0x08 - Flag to allow IUCV control interrupts
*/
- parm = iucv_param[cpu];
+ parm = iucv_param_irq[cpu];
memset(parm, 0, sizeof(union iucv_param));
parm->set_mask.ipmask = 0xf8;
iucv_call_b2f0(IUCV_SETMASK, parm);
@@ -379,7 +380,7 @@
union iucv_param *parm;
/* Disable all iucv interrupts. */
- parm = iucv_param[cpu];
+ parm = iucv_param_irq[cpu];
memset(parm, 0, sizeof(union iucv_param));
iucv_call_b2f0(IUCV_SETMASK, parm);
@@ -403,7 +404,7 @@
return;
/* Declare interrupt buffer. */
- parm = iucv_param[cpu];
+ parm = iucv_param_irq[cpu];
memset(parm, 0, sizeof(union iucv_param));
parm->db.ipbfadr1 = virt_to_phys(iucv_irq_data[cpu]);
rc = iucv_call_b2f0(IUCV_DECLARE_BUFFER, parm);
@@ -460,7 +461,7 @@
iucv_block_cpu(NULL);
/* Retrieve interrupt buffer. */
- parm = iucv_param[cpu];
+ parm = iucv_param_irq[cpu];
iucv_call_b2f0(IUCV_RETRIEVE_BUFFER, parm);
/* Clear indication that an iucv buffer exists for this cpu. */
@@ -574,11 +575,22 @@
iucv_irq_data[cpu] = NULL;
return NOTIFY_BAD;
}
+ iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
+ GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+ if (!iucv_param_irq[cpu]) {
+ kfree(iucv_param[cpu]);
+ iucv_param[cpu] = NULL;
+ kfree(iucv_irq_data[cpu]);
+ iucv_irq_data[cpu] = NULL;
+ return NOTIFY_BAD;
+ }
break;
case CPU_UP_CANCELED:
case CPU_UP_CANCELED_FROZEN:
case CPU_DEAD:
case CPU_DEAD_FROZEN:
+ kfree(iucv_param_irq[cpu]);
+ iucv_param_irq[cpu] = NULL;
kfree(iucv_param[cpu]);
iucv_param[cpu] = NULL;
kfree(iucv_irq_data[cpu]);
@@ -625,7 +637,7 @@
{
union iucv_param *parm;
- parm = iucv_param[smp_processor_id()];
+ parm = iucv_param_irq[smp_processor_id()];
memset(parm, 0, sizeof(union iucv_param));
if (userdata)
memcpy(parm->ctrl.ipuser, userdata, sizeof(parm->ctrl.ipuser));
@@ -918,10 +930,8 @@
if (iucv_active_cpu != smp_processor_id())
spin_lock_bh(&iucv_table_lock);
rc = iucv_sever_pathid(path->pathid, userdata);
- if (!rc) {
- iucv_path_table[path->pathid] = NULL;
- list_del_init(&path->list);
- }
+ iucv_path_table[path->pathid] = NULL;
+ list_del_init(&path->list);
if (iucv_active_cpu != smp_processor_id())
spin_unlock_bh(&iucv_table_lock);
preempt_enable();
@@ -1413,7 +1423,7 @@
else {
iucv_sever_pathid(path->pathid, NULL);
iucv_path_table[path->pathid] = NULL;
- list_del_init(&path->list);
+ list_del(&path->list);
iucv_path_free(path);
}
}
@@ -1717,6 +1727,13 @@
rc = -ENOMEM;
goto out_free;
}
+ iucv_param_irq[cpu] = kmalloc_node(sizeof(union iucv_param),
+ GFP_KERNEL|GFP_DMA, cpu_to_node(cpu));
+ if (!iucv_param_irq[cpu]) {
+ rc = -ENOMEM;
+ goto out_free;
+ }
+
}
rc = register_hotcpu_notifier(&iucv_cpu_notifier);
if (rc)
@@ -1734,6 +1751,8 @@
unregister_hotcpu_notifier(&iucv_cpu_notifier);
out_free:
for_each_possible_cpu(cpu) {
+ kfree(iucv_param_irq[cpu]);
+ iucv_param_irq[cpu] = NULL;
kfree(iucv_param[cpu]);
iucv_param[cpu] = NULL;
kfree(iucv_irq_data[cpu]);
@@ -1764,6 +1783,8 @@
spin_unlock_irq(&iucv_queue_lock);
unregister_hotcpu_notifier(&iucv_cpu_notifier);
for_each_possible_cpu(cpu) {
+ kfree(iucv_param_irq[cpu]);
+ iucv_param_irq[cpu] = NULL;
kfree(iucv_param[cpu]);
iucv_param[cpu] = NULL;
kfree(iucv_irq_data[cpu]);