diff options
| author | Claudiu Manoil <claudiu.manoil@freescale.com> | 2014-03-18 14:21:47 (GMT) |
|---|---|---|
| committer | Madalin-Cristian Bucur <madalin.bucur@freescale.com> | 2014-03-24 15:53:35 (GMT) |
| commit | c6ffe7138605a35fc37156184de906f82eca1353 (patch) | |
| tree | 40a5ce5446dcdd5a37b07e7b95944173b8749f4a /drivers/net/ethernet/freescale/gianfar.c | |
| parent | 924d40725a825d8c1a74b87b46bb93e653e10b18 (diff) | |
| download | linux-fsl-qoriq-c6ffe7138605a35fc37156184de906f82eca1353.tar.xz | |
gianfar: Fix P1010 config regression (SQ polling)
The P1010 device tree restricts the number of
supported interrupt groups to 1, although the eth
controller can support 2 interrupt groups and the
driver assumes the Multi-Group mode ("fsl,etsec2" model).
So, in this case the assumption that the Multi-Group
mode (MQ_MG_MODE) devices always support 2 interrupt
groups is false. To fix this, a check for the actual
number of interrupt groups enabled in the board's
device tree has been added in gfar_probe for the
"fsl,etsec2" devices.
Without this fix, P1010 based boards claim support for
2 Tx queues to the net stack but only one is actually
allocated, leading to NULL access in xmit. This issue
was introduced by enabling Single-Queue polling for
the P1010 devices.
Change-Id: I74e2d143557a7e2cebce8928ac42160e79957f0c
Signed-off-by: Claudiu Manoil <claudiu.manoil@freescale.com>
Reviewed-on: http://git.am.freescale.net:8181/9876
Tested-by: Review Code-CDREVIEW <CDREVIEW@freescale.com>
Reviewed-by: Rajan Gupta <rajan.gupta@freescale.com>
Reviewed-by: Madalin-Cristian Bucur <madalin.bucur@freescale.com>
Diffstat (limited to 'drivers/net/ethernet/freescale/gianfar.c')
| -rw-r--r-- | drivers/net/ethernet/freescale/gianfar.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/net/ethernet/freescale/gianfar.c b/drivers/net/ethernet/freescale/gianfar.c index bf35061..307b70c 100644 --- a/drivers/net/ethernet/freescale/gianfar.c +++ b/drivers/net/ethernet/freescale/gianfar.c @@ -767,9 +767,19 @@ static int gfar_of_init(struct platform_device *ofdev, struct net_device **pdev) num_tx_qs = 1; num_rx_qs = 1; } else { /* MQ_MG_MODE */ + /* get the actual number of supported groups */ + unsigned int num_grps = of_get_available_child_count(np); + + if (num_grps == 0 || num_grps > MAXGROUPS) { + dev_err(&ofdev->dev, "Invalid # of int groups(%d)\n", + num_grps); + pr_err("Cannot do alloc_etherdev, aborting\n"); + return -EINVAL; + } + if (poll_mode == GFAR_SQ_POLLING) { - num_tx_qs = 2; /* one txq per int group */ - num_rx_qs = 2; /* one rxq per int group */ + num_tx_qs = num_grps; /* one txq per int group */ + num_rx_qs = num_grps; /* 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; |