[PATCH] [for 4.13] net: qcom/emac: fix double free of SGMII IRQ during shutdown

[Timur Tabi]

If the interface is not up, then don't try to close it during a
shutdown.  This avoids possible double free of the IRQ, which
can happen during a shutdown.

Fixes: 03eb3eb4d4d5 ("net: qcom/emac: add shutdown function")
Signed-off-by: Timur Tabi <ti...@codeaurora.org>
---
 drivers/net/ethernet/qualcomm/emac/emac.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/qualcomm/emac/emac.c 
b/drivers/net/ethernet/qualcomm/emac/emac.c
index 746d94e..60850bf 100644
--- a/drivers/net/ethernet/qualcomm/emac/emac.c
+++ b/drivers/net/ethernet/qualcomm/emac/emac.c
@@ -766,11 +766,13 @@ static void emac_shutdown(struct platform_device *pdev)
        struct emac_adapter *adpt = netdev_priv(netdev);
        struct emac_sgmii *sgmii = &adpt->phy;
 
-       /* Closing the SGMII turns off its interrupts */
-       sgmii->close(adpt);
+       if (netdev->flags & IFF_UP) {
+               /* Closing the SGMII turns off its interrupts */
+               sgmii->close(adpt);
 
-       /* Resetting the MAC turns off all DMA and its interrupts */
-       emac_mac_reset(adpt);
+               /* Resetting the MAC turns off all DMA and its interrupts */
+               emac_mac_reset(adpt);
+       }
 }
 
 static struct platform_driver emac_platform_driver = {
-- 
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Technologies, Inc.  Qualcomm Technologies, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.