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cxgb4: Don't sleep when mbox cmd is issued from interrupt context 

When link goes down, from the interrupt handler DCB priority for the
Tx queues needs to be unset. We issue mbox command to unset the Tx queue
priority with negative timeout. In t4_wr_mbox_meat_timeout() do not sleep
when negative timeout is passed, since it is called from interrupt context.

Signed-off-by: Hariprasad Shenai <hariprasad@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Hariprasad Shenai 2016-05-03 18:58:01 +05:30 committed by David S. Miller
parent ecc9120e05
commit 5a20f5cfd7
1 changed files with 6 additions and 0 deletions
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6
drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
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@ -304,6 +304,12 @@ int t4_wr_mbox_meat_timeout(struct adapter *adap, int mbox, const void *cmd,
if (adap->pdev->error_state != pci_channel_io_normal)
return -EIO;
/* If we have a negative timeout, that implies that we can't sleep. */
if (timeout < 0) {
sleep_ok = false;
timeout = -timeout;
}
v = MBOWNER_G(t4_read_reg(adap, ctl_reg));
for (i = 0; v == MBOX_OWNER_NONE && i < 3; i++)
v = MBOWNER_G(t4_read_reg(adap, ctl_reg));