Commit 5a20f5cf authored May 03, 2016 by Hariprasad Shenai Committed by David S. Miller May 04, 2016

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>

parent ecc9120e

drivers/net/ethernet/chelsio/cxgb4/t4_hw.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -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));