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net: dsa: variable number of ports

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Change the ports[DSA_MAX_PORTS] array of the dsa_switch structure for a
zero-length array, allocated at the same time as the dsa_switch
structure itself. A dsa_switch_alloc() helper is provided for that.

This commit brings no functional change yet since we pass DSA_MAX_PORTS
as the number of ports for the moment. Future patches can update the DSA
drivers separately to support dynamic number of ports.

Signed-off-by: Vivien Didelot <vivien.didelot@savoirfairelinux.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Vivien Didelot 2017-01-27 15:29:36 -05:00 • committed by David S. Miller
parent 1f5d492a34
commit a0c02161ec
6 changed files with 29 additions and 11 deletions
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5
net/dsa/dsa.c
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@ -347,8 +347,8 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
/*
* Allocate and initialise switch state.
*/
ds = devm_kzalloc(parent, sizeof(*ds), GFP_KERNEL);
if (ds == NULL)
ds = dsa_switch_alloc(parent, DSA_MAX_PORTS);
if (!ds)
return ERR_PTR(-ENOMEM);
ds->dst = dst;
@ -356,7 +356,6 @@ dsa_switch_setup(struct dsa_switch_tree *dst, int index,
ds->cd = cd;
ds->ops = ops;
ds->priv = priv;
ds->dev = parent;
ret = dsa_switch_setup_one(ds, parent);
if (ret)