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IB/srpt: Wait until channel release has finished during module unload

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Introduce the helper function srpt_set_enabled(). Protect
sport->enabled changes with sdev->mutex. Makes configfs writes
into 'enabled' wait until all channel resources have been freed.
Wait until channel release has finished during kernel module
unload.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche 2017-11-03 16:20:55 -07:00 committed by Doug Ledford
parent 01b3ee13c2
commit 8b6dc529ea
1 changed files with 20 additions and 23 deletions
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43
drivers/infiniband/ulp/srpt/ib_srpt.c
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@ -1821,19 +1821,31 @@ static bool srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)
return wait;
}
static void __srpt_close_all_ch(struct srpt_device *sdev)
static void srpt_set_enabled(struct srpt_port *sport, bool enabled)
__must_hold(&sdev->mutex)
{
struct srpt_device *sdev = sport->sdev;
struct srpt_rdma_ch *ch;
lockdep_assert_held(&sdev->mutex);
if (sport->enabled == enabled)
return;
sport->enabled = enabled;
if (sport->enabled)
return;
again:
list_for_each_entry(ch, &sdev->rch_list, list) {
if (srpt_disconnect_ch(ch) >= 0)
pr_info("Closing channel %s-%d because target %s has been disabled\n",
ch->sess_name, ch->qp->qp_num,
sdev->device->name);
srpt_close_ch(ch);
if (ch->sport == sport) {
pr_info("%s: closing channel %s-%d\n",
sdev->device->name, ch->sess_name,
ch->qp->qp_num);
if (srpt_disconnect_ch_sync(ch))
goto again;
}
}
}
static void srpt_free_ch(struct kref *kref)
@ -2496,8 +2508,7 @@ static int srpt_release_sdev(struct srpt_device *sdev)
mutex_lock(&sdev->mutex);
for (i = 0; i < ARRAY_SIZE(sdev->port); i++)
sdev->port[i].enabled = false;
__srpt_close_all_ch(sdev);
srpt_set_enabled(&sdev->port[i], false);
mutex_unlock(&sdev->mutex);
res = wait_event_interruptible(sdev->ch_releaseQ,
@ -3083,7 +3094,6 @@ static ssize_t srpt_tpg_enable_store(struct config_item *item,
struct se_portal_group *se_tpg = to_tpg(item);
struct srpt_port *sport = srpt_tpg_to_sport(se_tpg);
struct srpt_device *sdev = sport->sdev;
struct srpt_rdma_ch *ch;
unsigned long tmp;
int ret;
@ -3097,24 +3107,11 @@ static ssize_t srpt_tpg_enable_store(struct config_item *item,
pr_err("Illegal value for srpt_tpg_store_enable: %lu\n", tmp);
return -EINVAL;
}
if (sport->enabled == tmp)
goto out;
sport->enabled = tmp;
if (sport->enabled)
goto out;
mutex_lock(&sdev->mutex);
list_for_each_entry(ch, &sdev->rch_list, list) {
if (ch->sport == sport) {
pr_debug("%s: ch %p %s-%d\n", __func__, ch,
ch->sess_name, ch->qp->qp_num);
srpt_disconnect_ch(ch);
srpt_close_ch(ch);
}
}
srpt_set_enabled(sport, tmp);
mutex_unlock(&sdev->mutex);
out:
return count;
}