luck/tmp_suning_uos_patched
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cnic: Fix ISCSI_KEVENT_IF_DOWN message handling.

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When a net device goes down or when the bnx2i driver is unloaded,
the code was not generating the ISCSI_KEVENT_IF_DOWN message
properly and this could cause the userspace driver to crash.

This is fixed by sending the message properly in the shutdown path.
cnic_uio_stop() is also added to send the message when bnx2i is
unregistering.

Signed-off-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Michael Chan 2009-07-27 11:25:58 -07:00 committed by David S. Miller
parent 0cbb0a781a
commit 6d7760a88c
1 changed files with 21 additions and 2 deletions
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23
drivers/net/cnic.c
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@ -227,7 +227,7 @@ static int cnic_send_nlmsg(struct cnic_local *cp, u32 type,
}
rcu_read_lock();
ulp_ops = rcu_dereference(cp->ulp_ops[CNIC_ULP_ISCSI]);
ulp_ops = rcu_dereference(cnic_ulp_tbl[CNIC_ULP_ISCSI]);
if (ulp_ops)
ulp_ops->iscsi_nl_send_msg(cp->dev, msg_type, buf, len);
rcu_read_unlock();
@ -319,6 +319,20 @@ static int cnic_abort_prep(struct cnic_sock *csk)
return 0;
}
static void cnic_uio_stop(void)
{
struct cnic_dev *dev;
read_lock(&cnic_dev_lock);
list_for_each_entry(dev, &cnic_dev_list, list) {
struct cnic_local *cp = dev->cnic_priv;
if (cp->cnic_uinfo)
cnic_send_nlmsg(cp, ISCSI_KEVENT_IF_DOWN, NULL);
}
read_unlock(&cnic_dev_lock);
}
int cnic_register_driver(int ulp_type, struct cnic_ulp_ops *ulp_ops)
{
struct cnic_dev *dev;
@ -390,6 +404,9 @@ int cnic_unregister_driver(int ulp_type)
}
read_unlock(&cnic_dev_lock);
if (ulp_type == CNIC_ULP_ISCSI)
cnic_uio_stop();
rcu_assign_pointer(cnic_ulp_tbl[ulp_type], NULL);
mutex_unlock(&cnic_lock);
@ -632,7 +649,6 @@ static void cnic_free_resc(struct cnic_dev *dev)
int i = 0;
if (cp->cnic_uinfo) {
cnic_send_nlmsg(cp, ISCSI_KEVENT_IF_DOWN, NULL);
while (cp->uio_dev != -1 && i < 15) {
msleep(100);
i++;
@ -1057,6 +1073,9 @@ static void cnic_ulp_stop(struct cnic_dev *dev)
struct cnic_local *cp = dev->cnic_priv;
int if_type;
if (cp->cnic_uinfo)
cnic_send_nlmsg(cp, ISCSI_KEVENT_IF_DOWN, NULL);
rcu_read_lock();
for (if_type = 0; if_type < MAX_CNIC_ULP_TYPE; if_type++) {
struct cnic_ulp_ops *ulp_ops;