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firewire: fw-sbp2: wait for completion of fetch agent reset

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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 <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Stefan Richter 2008-02-03 23:08:58 +01:00
parent d94a983526
commit e0e6021555
1 changed files with 29 additions and 12 deletions
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41
drivers/firewire/fw-sbp2.c
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@ -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;
kfree(t);
complete(done);
}
static int sbp2_agent_reset(struct sbp2_logical_unit *lu)
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;
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 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: