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author | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2008-03-20 23:48:23 +0100 |
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committer | Stefan Richter <stefanr@s5r6.in-berlin.de> | 2008-04-18 17:55:36 +0200 |
commit | 2a0a2590498be7b92e3e76409c9b8ee722e23c8f (patch) | |
tree | 4e98255596b8f7bdbd2fc200e5a72a3866544583 | |
parent | e09770db0fa33baf8df21fbc18aa24a080330c3f (diff) | |
download | op-kernel-dev-2a0a2590498be7b92e3e76409c9b8ee722e23c8f.zip op-kernel-dev-2a0a2590498be7b92e3e76409c9b8ee722e23c8f.tar.gz |
firewire: wait until PHY configuration packet was transmitted (fix bus reset loop)
We now exit fw_send_phy_config /after/ the PHY config packet has been
transmitted, instead of before. A subsequent fw_core_initiate_bus_reset
will therefore not overlap with the transmission. This is meant to make
the send PHY config packet + reset bus routine more deterministic.
Fixes bus reset loop and eventual panic with
- VIA VT6307 + IOGEAR hub + Unibrain Fire-i camera
http://bugzilla.kernel.org/show_bug.cgi?id=10128
- JMicron card
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
Signed-off-by: Jarod Wilson <jwilson@redhat.com>
-rw-r--r-- | drivers/firewire/fw-transaction.c | 51 |
1 files changed, 25 insertions, 26 deletions
diff --git a/drivers/firewire/fw-transaction.c b/drivers/firewire/fw-transaction.c index 3682e75..051be78 100644 --- a/drivers/firewire/fw-transaction.c +++ b/drivers/firewire/fw-transaction.c @@ -18,6 +18,7 @@ * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ +#include <linux/completion.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> @@ -294,42 +295,40 @@ fw_send_request(struct fw_card *card, struct fw_transaction *t, } EXPORT_SYMBOL(fw_send_request); +struct fw_phy_packet { + struct fw_packet packet; + struct completion done; +}; + static void transmit_phy_packet_callback(struct fw_packet *packet, struct fw_card *card, int status) { - kfree(packet); -} - -static void send_phy_packet(struct fw_card *card, u32 data, int generation) -{ - struct fw_packet *packet; + struct fw_phy_packet *p = + container_of(packet, struct fw_phy_packet, packet); - packet = kzalloc(sizeof(*packet), GFP_ATOMIC); - if (packet == NULL) - return; - - packet->header[0] = data; - packet->header[1] = ~data; - packet->header_length = 8; - packet->payload_length = 0; - packet->speed = SCODE_100; - packet->generation = generation; - packet->callback = transmit_phy_packet_callback; - - card->driver->send_request(card, packet); + complete(&p->done); } void fw_send_phy_config(struct fw_card *card, int node_id, int generation, int gap_count) { - u32 q; - - q = PHY_IDENTIFIER(PHY_PACKET_CONFIG) | - PHY_CONFIG_ROOT_ID(node_id) | - PHY_CONFIG_GAP_COUNT(gap_count); - - send_phy_packet(card, q, generation); + struct fw_phy_packet p; + u32 data = PHY_IDENTIFIER(PHY_PACKET_CONFIG) | + PHY_CONFIG_ROOT_ID(node_id) | + PHY_CONFIG_GAP_COUNT(gap_count); + + p.packet.header[0] = data; + p.packet.header[1] = ~data; + p.packet.header_length = 8; + p.packet.payload_length = 0; + p.packet.speed = SCODE_100; + p.packet.generation = generation; + p.packet.callback = transmit_phy_packet_callback; + init_completion(&p.done); + + card->driver->send_request(card, &p.packet); + wait_for_completion(&p.done); } void fw_flush_transactions(struct fw_card *card) |