we need to verify that a an adapter pointer, still points to a
valid adapter. this is not possible through other global structures,
such as net_namespace_list. the problem with the net_namespace_list
is that an adapter can have multiple interfaces, hence we had to
de-reference the maybe invalid pointer to get the interface struct.
Signed-off-by: Andreas Fenkart <afenkart@xxxxxxxxx>
---
drivers/net/wireless/mwifiex/sdio.c | 14 ++++++++++++++
drivers/net/wireless/mwifiex/sdio.h | 1 +
2 files changed, 15 insertions(+)
diff --git a/drivers/net/wireless/mwifiex/sdio.c b/drivers/net/wireless/mwifiex/sdio.c
index 91e36cd..a70e114 100644
--- a/drivers/net/wireless/mwifiex/sdio.c
+++ b/drivers/net/wireless/mwifiex/sdio.c
@@ -69,6 +69,12 @@ static struct memory_type_mapping mem_type_mapping_tbl[] = {
};
/*
+ * list of active cards
+ */
+static LIST_HEAD(cards);
+static DEFINE_MUTEX(cards_mutex);
+
+/*
* SDIO probe.
*
* This function probes an mwifiex device and registers it. It allocates
@@ -130,6 +136,10 @@ mwifiex_sdio_probe(struct sdio_func *func, const struct sdio_device_id *id)
ret = -1;
}
+ mutex_lock(&cards_mutex);
+ list_add(&card->next, &cards);
+ mutex_unlock(&cards_mutex);
+
return ret;
}
@@ -196,6 +206,10 @@ mwifiex_sdio_remove(struct sdio_func *func)
if (!card)
return;
+ mutex_lock(&cards_mutex);
+ list_del(&card->next);
+ mutex_unlock(&cards_mutex);
+
adapter = card->adapter;
if (!adapter || !adapter->priv_num)
return;
diff --git a/drivers/net/wireless/mwifiex/sdio.h b/drivers/net/wireless/mwifiex/sdio.h
index 957cca2..9be5650 100644
--- a/drivers/net/wireless/mwifiex/sdio.h
+++ b/drivers/net/wireless/mwifiex/sdio.h
@@ -260,6 +260,7 @@ struct sdio_mmc_card {
struct mwifiex_sdio_mpa_tx mpa_tx;
struct mwifiex_sdio_mpa_rx mpa_rx;
+ struct list_head next;
};
struct mwifiex_sdio_device {
--
2.1.4
--
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