firewire: core: fix iso context shutdown on card removal

If isochronous contexts existed when firewire-ohci was unloaded, the
core iso shutdown functions crashed with NULL dereferences, and buffers
etc. weren't released.

How the fix works:  We first copy the card driver's iso shutdown hooks
into the dummy driver, then fw_destroy_nodes notifies upper layers of
devices going away, these should shut down (including their iso
contexts), wait_for_completion(&card->done) will be triggered after
upper layers gave up all fw_device references, after which the card
driver's shutdown proceeds.

Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>

1 files changed, 11 insertions, 7 deletions

diff --git a/drivers/firewire/core-card.c b/drivers/firewire/core-card.c
index 667603ac14b..543fccac81b 100644
--- a/drivers/firewire/core-card.c
+++ b/drivers/firewire/core-card.c
@@ -461,11 +461,11 @@ EXPORT_SYMBOL(fw_card_add);
 
 
 /*
- * The next few functions implements a dummy driver that use once a
- * card driver shuts down an fw_card.  This allows the driver to
- * cleanly unload, as all IO to the card will be handled by the dummy
- * driver instead of calling into the (possibly) unloaded module.  The
- * dummy driver just fails all IO.
+ * The next few functions implement a dummy driver that is used once a card
+ * driver shuts down an fw_card.  This allows the driver to cleanly unload,
+ * as all IO to the card will be handled (and failed) by the dummy driver
+ * instead of calling into the module.  Only functions for iso context
+ * shutdown still need to be provided by the card driver.
  */
 
 static int dummy_enable(struct fw_card *card, u32 *config_rom, size_t length)
@@ -512,7 +512,7 @@ static int dummy_enable_phys_dma(struct fw_card *card,
         return -ENODEV;
 }
 
-static struct fw_card_driver dummy_driver = {
+static const struct fw_card_driver dummy_driver_template = {
         .enable          = dummy_enable,
         .update_phy_reg  = dummy_update_phy_reg,
         .set_config_rom  = dummy_set_config_rom,
@@ -531,6 +531,8 @@ void fw_card_release(struct kref *kref)
 
 void fw_core_remove_card(struct fw_card *card)
 {
+        struct fw_card_driver dummy_driver = dummy_driver_template;
+
         card->driver->update_phy_reg(card, 4,
                                      PHY_LINK_ACTIVE | PHY_CONTENDER, 0);
         fw_core_initiate_bus_reset(card, 1);
@@ -539,7 +541,9 @@ void fw_core_remove_card(struct fw_card *card)
         list_del_init(&card->link);
         mutex_unlock(&card_mutex);
 
-        /* Set up the dummy driver. */
+        /* Switch off most of the card driver interface. */
+        dummy_driver.free_iso_context   = card->driver->free_iso_context;
+        dummy_driver.stop_iso           = card->driver->stop_iso;
         card->driver = &dummy_driver;
 
         fw_destroy_nodes(card);