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authorThomas Klein <tklein@de.ibm.com>2010-04-20 23:11:31 +0000
committerDavid S. Miller <davem@davemloft.net>2010-04-21 22:32:44 -0700
commita7c561f2e32f98b477f5fe670b3f294be6b1eae2 (patch)
tree8ce32aacea816de1dbbd9e4bc9ce3460ba638c03 /drivers/net/ehea/ehea_main.c
parentea96ceac80cc82cb1c54a37bb8aaf4e695e87d0a (diff)
ehea: fix possible DLPAR/mem deadlock
Force serialization of userspace-triggered DLPAR/mem operations Signed-off-by: Thomas Klein <tklein@de.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ehea/ehea_main.c')
-rw-r--r--drivers/net/ehea/ehea_main.c19
1 files changed, 14 insertions, 5 deletions
diff --git a/drivers/net/ehea/ehea_main.c b/drivers/net/ehea/ehea_main.c
index c35d1e3631d1..39774817c3eb 100644
--- a/drivers/net/ehea/ehea_main.c
+++ b/drivers/net/ehea/ehea_main.c
@@ -2889,7 +2889,6 @@ static void ehea_rereg_mrs(struct work_struct *work)
int ret, i;
struct ehea_adapter *adapter;
- mutex_lock(&dlpar_mem_lock);
ehea_info("LPAR memory changed - re-initializing driver");
list_for_each_entry(adapter, &adapter_list, list)
@@ -2959,7 +2958,6 @@ static void ehea_rereg_mrs(struct work_struct *work)
}
ehea_info("re-initializing driver complete");
out:
- mutex_unlock(&dlpar_mem_lock);
return;
}
@@ -3542,7 +3540,14 @@ void ehea_crash_handler(void)
static int ehea_mem_notifier(struct notifier_block *nb,
unsigned long action, void *data)
{
+ int ret = NOTIFY_BAD;
struct memory_notify *arg = data;
+
+ if (!mutex_trylock(&dlpar_mem_lock)) {
+ ehea_info("ehea_mem_notifier must not be called parallelized");
+ goto out;
+ }
+
switch (action) {
case MEM_CANCEL_OFFLINE:
ehea_info("memory offlining canceled");
@@ -3551,14 +3556,14 @@ static int ehea_mem_notifier(struct notifier_block *nb,
ehea_info("memory is going online");
set_bit(__EHEA_STOP_XFER, &ehea_driver_flags);
if (ehea_add_sect_bmap(arg->start_pfn, arg->nr_pages))
- return NOTIFY_BAD;
+ goto out_unlock;
ehea_rereg_mrs(NULL);
break;
case MEM_GOING_OFFLINE:
ehea_info("memory is going offline");
set_bit(__EHEA_STOP_XFER, &ehea_driver_flags);
if (ehea_rem_sect_bmap(arg->start_pfn, arg->nr_pages))
- return NOTIFY_BAD;
+ goto out_unlock;
ehea_rereg_mrs(NULL);
break;
default:
@@ -3566,8 +3571,12 @@ static int ehea_mem_notifier(struct notifier_block *nb,
}
ehea_update_firmware_handles();
+ ret = NOTIFY_OK;
- return NOTIFY_OK;
+out_unlock:
+ mutex_unlock(&dlpar_mem_lock);
+out:
+ return ret;
}
static struct notifier_block ehea_mem_nb = {