From b338ce270ed589f8a7b62e239632baa48f947b17 Mon Sep 17 00:00:00 2001 From: Claudiu Manoil Date: Tue, 11 Mar 2014 18:01:24 +0200 Subject: [PATCH] gianfar: Fix multi-queue support checks @probe() priv is not instantiated at gfar_of_init() time, when parsing the DT for info on supported HW queues. Before the netdev can be allocated, the number of supported queues must be known. Because the number of supported queues depends on device type, move the compatibility checks before netdev allocation. Local vars are used to hold the operation mode info before netdev allocation. This fixes the null accesses for priv->.., in gfar_of_init. Signed-off-by: Claudiu Manoil Signed-off-by: David S. Miller --- drivers/net/ethernet/freescale/gianfar.c | 28 +++++++++++++++--------- 1 file changed, 18 insertions(+), 10 deletions(-) diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c index 28effbecdab6..68d9bf7940f6 100644 --- a/drivers/net/ethernet/freescale/gianfar.c +++ b/drivers/net/ethernet/freescale/gianfar.c @@ -733,21 +733,30 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev) const u32 *stash_idx; unsigned int num_tx_qs, num_rx_qs; u32 *tx_queues, *rx_queues; + unsigned short mode, poll_mode; if (!np || !of_device_is_available(np)) return -ENODEV; + if (of_device_is_compatible(np, "fsl,etsec2")) { + mode = MQ_MG_MODE; + poll_mode = GFAR_SQ_POLLING; + } else { + mode = SQ_SG_MODE; + poll_mode = GFAR_SQ_POLLING; + } + /* parse the num of HW tx and rx queues */ tx_queues = (u32 *)of_get_property(np, "fsl,num_tx_queues", NULL); rx_queues = (u32 *)of_get_property(np, "fsl,num_rx_queues", NULL); - if (priv->mode == SQ_SG_MODE) { + if (mode == SQ_SG_MODE) { num_tx_qs = 1; num_rx_qs = 1; } else { /* MQ_MG_MODE */ - if (priv->poll_mode == GFAR_SQ_POLLING) { - num_tx_qs = 2; /* one q per int group */ - num_rx_qs = 2; /* one q per int group */ + if (poll_mode == GFAR_SQ_POLLING) { + num_tx_qs = 2; /* one txq per int group */ + num_rx_qs = 2; /* one rxq per int group */ } else { /* GFAR_MQ_POLLING */ num_tx_qs = tx_queues ? *tx_queues : 1; num_rx_qs = rx_queues ? *rx_queues : 1; @@ -776,6 +785,9 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev) priv = netdev_priv(dev); priv->ndev = dev; + priv->mode = mode; + priv->poll_mode = poll_mode; + priv->num_tx_queues = num_tx_qs; netif_set_real_num_rx_queues(dev, num_rx_qs); priv->num_rx_queues = num_rx_qs; @@ -799,17 +811,13 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev) priv->gfargrp[i].regs = NULL; /* Parse and initialize group specific information */ - if (of_device_is_compatible(np, "fsl,etsec2")) { - priv->mode = MQ_MG_MODE; - priv->poll_mode = GFAR_SQ_POLLING; + if (priv->mode == MQ_MG_MODE) { for_each_child_of_node(np, child) { err = gfar_parse_group(child, priv, model); if (err) goto err_grp_init; } - } else { - priv->mode = SQ_SG_MODE; - priv->poll_mode = GFAR_SQ_POLLING; + } else { /* SQ_SG_MODE */ err = gfar_parse_group(np, priv, model); if (err) goto err_grp_init; -- 2.34.1