From e0e60215552d4d40caf581a8d3247203fe948fe7 Mon Sep 17 00:00:00 2001 From: Stefan Richter Date: Sun, 3 Feb 2008 23:08:58 +0100 Subject: [PATCH] firewire: fw-sbp2: wait for completion of fetch agent reset Like the old sbp2 driver, wait for the write transaction to the AGENT_RESET to complete before proceeding (after login, after reconnect, or in SCSI error handling). There is one occasion where AGENT_RESET is written to from atomic context when getting DEAD status for a command ORB. There we still continue without waiting for the transaction to complete because this is more difficult to fix... Signed-off-by: Stefan Richter --- drivers/firewire/fw-sbp2.c | 39 +++++++++++++++++++++++++++----------- 1 file changed, 28 insertions(+), 11 deletions(-) diff --git a/drivers/firewire/fw-sbp2.c b/drivers/firewire/fw-sbp2.c index 4a118fbc7b24..32b50f13e7a8 100644 --- a/drivers/firewire/fw-sbp2.c +++ b/drivers/firewire/fw-sbp2.c @@ -603,29 +603,46 @@ sbp2_send_management_orb(struct sbp2_logical_unit *lu, int node_id, static void complete_agent_reset_write(struct fw_card *card, int rcode, - void *payload, size_t length, void *data) + void *payload, size_t length, void *done) { - struct fw_transaction *t = data; + complete(done); +} + +static void sbp2_agent_reset(struct sbp2_logical_unit *lu) +{ + struct fw_device *device = fw_device(lu->tgt->unit->device.parent); + DECLARE_COMPLETION_ONSTACK(done); + struct fw_transaction t; + static u32 z; - kfree(t); + fw_send_request(device->card, &t, TCODE_WRITE_QUADLET_REQUEST, + lu->tgt->node_id, lu->generation, device->max_speed, + lu->command_block_agent_address + SBP2_AGENT_RESET, + &z, sizeof(z), complete_agent_reset_write, &done); + wait_for_completion(&done); } -static int sbp2_agent_reset(struct sbp2_logical_unit *lu) +static void +complete_agent_reset_write_no_wait(struct fw_card *card, int rcode, + void *payload, size_t length, void *data) +{ + kfree(data); +} + +static void sbp2_agent_reset_no_wait(struct sbp2_logical_unit *lu) { struct fw_device *device = fw_device(lu->tgt->unit->device.parent); struct fw_transaction *t; - static u32 zero; + static u32 z; - t = kzalloc(sizeof(*t), GFP_ATOMIC); + t = kmalloc(sizeof(*t), GFP_ATOMIC); if (t == NULL) - return -ENOMEM; + return; fw_send_request(device->card, t, TCODE_WRITE_QUADLET_REQUEST, lu->tgt->node_id, lu->generation, device->max_speed, lu->command_block_agent_address + SBP2_AGENT_RESET, - &zero, sizeof(zero), complete_agent_reset_write, t); - - return 0; + &z, sizeof(z), complete_agent_reset_write_no_wait, t); } static void sbp2_release_target(struct kref *kref) @@ -1086,7 +1103,7 @@ complete_command_orb(struct sbp2_orb *base_orb, struct sbp2_status *status) if (status != NULL) { if (STATUS_GET_DEAD(*status)) - sbp2_agent_reset(orb->lu); + sbp2_agent_reset_no_wait(orb->lu); switch (STATUS_GET_RESPONSE(*status)) { case SBP2_STATUS_REQUEST_COMPLETE: -- 2.20.1