[PATCH 4.19 42/86] ibmvnic: dont spin in tasklet

Greg Kroah-Hartman
2022-02-07T11:25:11Z

From: Sukadev Bhattiprolu <sukadev@linux.ibm.com>

[ Upstream commit 48079e7fdd0269d66b1d7d66ae88bd03162464ad ]

ibmvnic_tasklet() continuously spins waiting for responses to all
capability requests. It does this to avoid encountering an error
during initialization of the vnic. However if there is a bug in the
VIOS and we do not receive a response to one or more queries the
tasklet ends up spinning continuously leading to hard lock ups.

If we fail to receive a message from the VIOS it is reasonable to
timeout the login attempt rather than spin indefinitely in the tasklet.

Fixes: 249168ad07cd ("ibmvnic: Make CRQ interrupt tasklet wait for all capabilities crqs")
Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.ibm.com>
Reviewed-by: Dany Madden <drt@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/ethernet/ibm/ibmvnic.c | 6 ------
1 file changed, 6 deletions(-)

diff --git a/drivers/net/ethernet/ibm/ibmvnic.c b/drivers/net/ethernet/ibm/ibmvnic.c
index 9174eccfd9329..ffea634e03e8a 100644
--- a/drivers/net/ethernet/ibm/ibmvnic.c
+++ b/drivers/net/ethernet/ibm/ibmvnic.c
@@ -4493,12 +4493,6 @@ static void ibmvnic_tasklet(void *data)
ibmvnic_handle_crq(crq, adapter);
crq->generic.first = 0;
}
-
- /* remain in tasklet until all
- * capabilities responses are received
- */
- if (!adapter->wait_capability)
- done = true;
}
/* if capabilities CRQ's were sent in this tasklet, the following
* tasklet must wait until all responses are received
--
2.34.1