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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Karsten Graul <kgraul@linux.ibm.com>,
        Ursula Braun <ubraun@linux.ibm.com>,
        "David S. Miller" <davem@davemloft.net>
Subject: [PATCH 4.20 37/52] net/smc: fix smc_poll in SMC_INIT state
Date:   Mon, 18 Mar 2019 10:25:24 +0100
Message-Id: <20190318083847.666498466@linuxfoundation.org>
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4.20-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Ursula Braun <ubraun@linux.ibm.com>

[ Upstream commit d7cf4a3bf3a83c977a29055e1c4ffada7697b31f ]

smc_poll() returns with mask bit EPOLLPRI if the connection urg_state
is SMC_URG_VALID. Since SMC_URG_VALID is zero, smc_poll signals
EPOLLPRI errorneously if called in state SMC_INIT before the connection
is created, for instance in a non-blocking connect scenario.

This patch switches to non-zero values for the urg states.

Reviewed-by: Karsten Graul <kgraul@linux.ibm.com>
Fixes: de8474eb9d50 ("net/smc: urgent data support")
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 net/smc/smc.h |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/net/smc/smc.h
+++ b/net/smc/smc.h
@@ -113,9 +113,9 @@ struct smc_host_cdc_msg {		/* Connection
 } __aligned(8);
 
 enum smc_urg_state {
-	SMC_URG_VALID,			/* data present */
-	SMC_URG_NOTYET,			/* data pending */
-	SMC_URG_READ			/* data was already read */
+	SMC_URG_VALID	= 1,			/* data present */
+	SMC_URG_NOTYET	= 2,			/* data pending */
+	SMC_URG_READ	= 3,			/* data was already read */
 };
 
 struct smc_connection {