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sfc: Fix NAPI list corruption during ring reallocation 

Call netif_napi_{add,del}() on the NAPI contexts in the new and
old channels, respectively.

Since efx_init_napi() cannot fail, make its return type void.

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
This commit is contained in:
Ben Hutchings 2010-12-07 19:47:34 +00:00
parent 94dec6a2d2
commit e8f149924a
1 changed files with 19 additions and 12 deletions
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31
drivers/net/sfc/efx.c
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@ -197,7 +197,9 @@ MODULE_PARM_DESC(debug, "Bitmapped debugging message enable value");
static void efx_remove_channels(struct efx_nic *efx);
static void efx_remove_port(struct efx_nic *efx);
static void efx_init_napi(struct efx_nic *efx);
static void efx_fini_napi(struct efx_nic *efx);
static void efx_fini_napi_channel(struct efx_channel *channel);
static void efx_fini_struct(struct efx_nic *efx);
static void efx_start_all(struct efx_nic *efx);
static void efx_stop_all(struct efx_nic *efx);
@ -430,6 +432,7 @@ efx_alloc_channel(struct efx_nic *efx, int i, struct efx_channel *old_channel)
*channel = *old_channel;
channel->napi_dev = NULL;
memset(&channel->eventq, 0, sizeof(channel->eventq));
rx_queue = &channel->rx_queue;
@ -740,9 +743,13 @@ efx_realloc_channels(struct efx_nic *efx, u32 rxq_entries, u32 txq_entries)
if (rc)
goto rollback;
efx_init_napi(efx);
/* Destroy old channels */
for (i = 0; i < efx->n_channels; i++)
for (i = 0; i < efx->n_channels; i++) {
efx_fini_napi_channel(other_channel[i]);
efx_remove_channel(other_channel[i]);
}
out:
/* Free unused channel structures */
for (i = 0; i < efx->n_channels; i++)
@ -1601,7 +1608,7 @@ static int efx_ioctl(struct net_device *net_dev, struct ifreq *ifr, int cmd)
*
**************************************************************************/
static int efx_init_napi(struct efx_nic *efx)
static void efx_init_napi(struct efx_nic *efx)
{
struct efx_channel *channel;
@ -1610,18 +1617,21 @@ static int efx_init_napi(struct efx_nic *efx)
netif_napi_add(channel->napi_dev, &channel->napi_str,
efx_poll, napi_weight);
}
return 0;
}
static void efx_fini_napi_channel(struct efx_channel *channel)
{
if (channel->napi_dev)
netif_napi_del(&channel->napi_str);
channel->napi_dev = NULL;
}
static void efx_fini_napi(struct efx_nic *efx)
{
struct efx_channel *channel;
efx_for_each_channel(channel, efx) {
if (channel->napi_dev)
netif_napi_del(&channel->napi_str);
channel->napi_dev = NULL;
}
efx_for_each_channel(channel, efx)
efx_fini_napi_channel(channel);
}
/**************************************************************************
@ -2343,9 +2353,7 @@ static int efx_pci_probe_main(struct efx_nic *efx)
if (rc)
goto fail1;
rc = efx_init_napi(efx);
if (rc)
goto fail2;
efx_init_napi(efx);
rc = efx->type->init(efx);
if (rc) {
@ -2376,7 +2384,6 @@ static int efx_pci_probe_main(struct efx_nic *efx)
efx->type->fini(efx);
fail3:
efx_fini_napi(efx);
fail2:
efx_remove_all(efx);
fail1:
return rc;