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net: ipa: allocate dummy net_device dynamically

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Embedding net_device into structures prohibits the usage of flexible
arrays in the net_device structure. For more details, see the discussion
at [1].

Un-embed the net_device from the private struct by converting it
into a pointer. Then use the leverage the new alloc_netdev_dummy()
helper to allocate and initialize dummy devices.

[1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/

Signed-off-by: Breno Leitao <leitao@debian.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Breno Leitao 2024-04-22 05:38:59 -07:00 committed by David S. Miller
parent b209bd6d0b
commit 1bdab0ee63
2 changed files with 9 additions and 5 deletions
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12
drivers/net/ipa/gsi.c
View file

@ -1728,10 +1728,10 @@ static int gsi_channel_setup_one(struct gsi *gsi, u32 channel_id)
gsi_channel_program(channel, true);
if (channel->toward_ipa)
netif_napi_add_tx(&gsi->dummy_dev, &channel->napi,
netif_napi_add_tx(gsi->dummy_dev, &channel->napi,
gsi_channel_poll);
else
netif_napi_add(&gsi->dummy_dev, &channel->napi,
netif_napi_add(gsi->dummy_dev, &channel->napi,
gsi_channel_poll);
return 0;
@ -2367,12 +2367,14 @@ int gsi_init(struct gsi *gsi, struct platform_device *pdev,
/* GSI uses NAPI on all channels. Create a dummy network device
* for the channel NAPI contexts to be associated with.
*/
init_dummy_netdev(&gsi->dummy_dev);
gsi->dummy_dev = alloc_netdev_dummy(0);
if (!gsi->dummy_dev)
return -ENOMEM;
init_completion(&gsi->completion);
ret = gsi_reg_init(gsi, pdev);
if (ret)
return ret;
goto err_reg_exit;
ret = gsi_irq_init(gsi, pdev); /* No matching exit required */
if (ret)
@ -2387,6 +2389,7 @@ int gsi_init(struct gsi *gsi, struct platform_device *pdev,
return 0;
err_reg_exit:
free_netdev(gsi->dummy_dev);
gsi_reg_exit(gsi);
return ret;
@ -2397,6 +2400,7 @@ void gsi_exit(struct gsi *gsi)
{
mutex_destroy(&gsi->mutex);
gsi_channel_exit(gsi);
free_netdev(gsi->dummy_dev);
gsi_reg_exit(gsi);
}

2
drivers/net/ipa/gsi.h
View file

@ -151,7 +151,7 @@ struct gsi {
struct mutex mutex; /* protects commands, programming */
struct gsi_channel channel[GSI_CHANNEL_COUNT_MAX];
struct gsi_evt_ring evt_ring[GSI_EVT_RING_COUNT_MAX];
struct net_device dummy_dev; /* needed for NAPI */
struct net_device *dummy_dev; /* needed for NAPI */
};
/**