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firewire: Add ref-counting for sbp2_device and hold a ref while we have work scheduled. 

Signed-off-by: Kristian Høgsberg <krh@redhat.com>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Kristian Høgsberg 2007-03-14 17:34:58 -04:00 committed by Stefan Richter
parent 7e35f7f318
commit b3d6e15114
1 changed files with 30 additions and 12 deletions
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42
drivers/firewire/fw-sbp2.c
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@ -51,6 +51,7 @@ typedef void (*scsi_done_fn_t) (struct scsi_cmnd *);
static const char sbp2_driver_name[] = "sbp2";
struct sbp2_device {
struct kref kref;
struct fw_unit *unit;
struct fw_address_handler address_handler;
struct list_head orb_list;
@ -513,6 +514,22 @@ static int add_scsi_devices(struct fw_unit *unit);
static void remove_scsi_devices(struct fw_unit *unit);
static void sbp2_reconnect(struct work_struct *work);
static void
release_sbp2_device(struct kref *kref)
{
struct sbp2_device *sd = container_of(kref, struct sbp2_device, kref);
sbp2_send_management_orb(sd->unit, sd->node_id, sd->generation,
SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
remove_scsi_devices(sd->unit);
fw_core_remove_address_handler(&sd->address_handler);
fw_notify("removed sbp2 unit %s\n", sd->unit->device.bus_id);
put_device(&sd->unit->device);
kfree(sd);
}
static void sbp2_login(struct work_struct *work)
{
struct sbp2_device *sd =
@ -537,6 +554,7 @@ static void sbp2_login(struct work_struct *work)
fw_error("failed to login to %s\n",
unit->device.bus_id);
remove_scsi_devices(unit);
kref_put(&sd->kref, release_sbp2_device);
}
return;
}
@ -577,6 +595,7 @@ static void sbp2_login(struct work_struct *work)
* retry login on bus reset. */
PREPARE_DELAYED_WORK(&sd->work, sbp2_login);
}
kref_put(&sd->kref, release_sbp2_device);
}
static int sbp2_probe(struct device *dev)
@ -595,6 +614,7 @@ static int sbp2_probe(struct device *dev)
unit->device.driver_data = sd;
sd->unit = unit;
INIT_LIST_HEAD(&sd->orb_list);
kref_init(&sd->kref);
sd->address_handler.length = 0x100;
sd->address_handler.address_callback = sbp2_status_write;
@ -650,10 +670,14 @@ static int sbp2_probe(struct device *dev)
unit->device.bus_id,
sd->workarounds, firmware_revision, model);
get_device(&unit->device);
/* We schedule work to do the login so we can easily
* reschedule retries. */
* reschedule retries. Always get the ref before scheduling
* work.*/
INIT_DELAYED_WORK(&sd->work, sbp2_login);
schedule_delayed_work(&sd->work, 0);
if (schedule_delayed_work(&sd->work, 0))
kref_get(&sd->kref);
return 0;
}
@ -663,15 +687,7 @@ static int sbp2_remove(struct device *dev)
struct fw_unit *unit = fw_unit(dev);
struct sbp2_device *sd = unit->device.driver_data;
sbp2_send_management_orb(unit, sd->node_id, sd->generation,
SBP2_LOGOUT_REQUEST, sd->login_id, NULL);
remove_scsi_devices(unit);
fw_core_remove_address_handler(&sd->address_handler);
kfree(sd);
fw_notify("removed sbp2 unit %s\n", dev->bus_id);
kref_put(&sd->kref, release_sbp2_device);
return 0;
}
@ -710,6 +726,7 @@ static void sbp2_reconnect(struct work_struct *work)
unit->device.bus_id, sd->retries);
sbp2_agent_reset(unit);
sbp2_cancel_orbs(unit);
kref_put(&sd->kref, release_sbp2_device);
}
static void sbp2_update(struct fw_unit *unit)
@ -719,7 +736,8 @@ static void sbp2_update(struct fw_unit *unit)
sd->retries = 0;
fw_device_enable_phys_dma(device);
schedule_delayed_work(&sd->work, 0);
if (schedule_delayed_work(&sd->work, 0))
kref_get(&sd->kref);
}
#define SBP2_UNIT_SPEC_ID_ENTRY 0x0000609e