Commit 73bb3e4a authored by Luis Carlos Cobo's avatar Luis Carlos Cobo Committed by John W. Linville
Browse files

mac80211: fix deadlocks in debugfs_netdev.c



The bug shows up with CONFIG_PREEMPT enabled. Pointed out by Andrew Morton.

Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: default avatarLuis Carlos Cobo <luisca@cozybit.com>
Signed-off-by: default avatarJohn W. Linville <linville@tuxdriver.com>
parent 7e879b55
......@@ -31,11 +31,13 @@ static ssize_t ieee80211_if_read(
ssize_t ret = -EINVAL;
read_lock(&dev_base_lock);
if (sdata->dev->reg_state == NETREG_REGISTERED) {
if (sdata->dev->reg_state == NETREG_REGISTERED)
ret = (*format)(sdata, buf, sizeof(buf));
ret = simple_read_from_buffer(userbuf, count, ppos, buf, ret);
}
read_unlock(&dev_base_lock);
if (ret != -EINVAL)
ret = simple_read_from_buffer(userbuf, count, ppos, buf, ret);
return ret;
}
......@@ -51,13 +53,13 @@ static ssize_t ieee80211_if_write(
memset(buf, 0x00, sizeof(buf));
buf_size = min(count, (sizeof(buf)-1));
read_lock(&dev_base_lock);
if (copy_from_user(buf, userbuf, buf_size))
goto endwrite;
return count;
read_lock(&dev_base_lock);
if (sdata->dev->reg_state == NETREG_REGISTERED)
(*format)(sdata, buf);
endwrite:
read_unlock(&dev_base_lock);
return count;
}
#endif
......
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment