netdev - [PATCH net-next 1/2] cxgb4: Don't sleep when mbox cmd is issued from interrupt context

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Message-Id: <1462282082-6894-2-git-send-email-hariprasad@chelsio.com>
Date:	Tue,  3 May 2016 18:58:01 +0530
From:	Hariprasad Shenai <hariprasad@...lsio.com>
To:	davem@...emloft.net
Cc:	netdev@...r.kernel.org, leedom@...lsio.com,
	swise@...ngridcomputing.com, nirranjan@...lsio.com,
	santosh@...lsio.com, Hariprasad Shenai <hariprasad@...lsio.com>
Subject: [PATCH net-next 1/2] 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@...lsio.com>
---
 drivers/net/ethernet/chelsio/cxgb4/t4_hw.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
index 49bcbf16c9ca..59f5e0b40286 100644
--- a/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
+++ b/drivers/net/ethernet/chelsio/cxgb4/t4_hw.c
@@ -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));
-- 
2.3.4