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net/mlx4_core: Fix sleeping while holding spinlock at rem_slave_counters 

When cleaning slave's counter resources, we hold a spinlock that
protects the slave's counters list. As part of the clean, we call
__mlx4_clear_if_stat which calls mlx4_alloc_cmd_mailbox which is a
sleepable function.

In order to fix this issue, hold the spinlock, and copy all counter
indices into a temporary array, and release the spinlock. Afterwards,
iterate over this array and free every counter. Repeat this scenario
until the original list is empty (a new counter might have been added
while releasing the counters from the temporary array).

Fixes: b72ca7e96a ("net/mlx4_core: Reset counters data when freed")
Reported-by: Moni Shoua <monis@mellanox.com>
Tested-by: Moni Shoua <monis@mellanox.com>
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eran Ben Elisha 2015-11-12 19:35:29 +02:00 committed by David S. Miller
parent d4e28cbd24
commit f5adbfee72
1 changed files with 27 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

39
drivers/net/ethernet/mellanox/mlx4/resource_tracker.c
View File

@ -4952,26 +4952,41 @@ static void rem_slave_counters(struct mlx4_dev *dev, int slave)
struct res_counter *counter;
struct res_counter *tmp;
int err;
int index;
int *counters_arr = NULL;
int i, j;
err = move_all_busy(dev, slave, RES_COUNTER);
if (err)
mlx4_warn(dev, "rem_slave_counters: Could not move all counters - too busy for slave %d\n",
slave);
spin_lock_irq(mlx4_tlock(dev));
list_for_each_entry_safe(counter, tmp, counter_list, com.list) {
if (counter->com.owner == slave) {
index = counter->com.res_id;
rb_erase(&counter->com.node,
&tracker->res_tree[RES_COUNTER]);
list_del(&counter->com.list);
kfree(counter);
__mlx4_counter_free(dev, index);
counters_arr = kmalloc_array(dev->caps.max_counters,
sizeof(*counters_arr), GFP_KERNEL);
if (!counters_arr)
return;
do {
i = 0;
j = 0;
spin_lock_irq(mlx4_tlock(dev));
list_for_each_entry_safe(counter, tmp, counter_list, com.list) {
if (counter->com.owner == slave) {
counters_arr[i++] = counter->com.res_id;
rb_erase(&counter->com.node,
&tracker->res_tree[RES_COUNTER]);
list_del(&counter->com.list);
kfree(counter);
}
}
spin_unlock_irq(mlx4_tlock(dev));
while (j < i) {
__mlx4_counter_free(dev, counters_arr[j++]);
mlx4_release_resource(dev, slave, RES_COUNTER, 1, 0);
}
}
spin_unlock_irq(mlx4_tlock(dev));
} while (i);
kfree(counters_arr);
}
static void rem_slave_xrcdns(struct mlx4_dev *dev, int slave)