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rfkill: Use switch to demux userspace operations 

Using a switch to handle different ev.op values in rfkill_fop_write()
makes the code easier to extend, as out-of-range values can always be
handled by the default case.

Signed-off-by: João Paulo Rechi Vita <jprvita@endlessm.com>
[roll in fix for RFKILL_OP_CHANGE from Jouni]
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
João Paulo Rechi Vita 2016-02-22 11:36:39 -05:00 committed by Johannes Berg
parent 98bd147d79
commit 1948b2a2ec
1 changed files with 22 additions and 14 deletions
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36
net/rfkill/core.c
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@ -1141,6 +1141,7 @@ static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
{
struct rfkill *rfkill;
struct rfkill_event ev;
int ret;
/* we don't need the 'hard' variable but accept it */
if (count < RFKILL_EVENT_SIZE_V1 - 1)
@ -1155,29 +1156,36 @@ static ssize_t rfkill_fop_write(struct file *file, const char __user *buf,
if (copy_from_user(&ev, buf, count))
return -EFAULT;
if (ev.op != RFKILL_OP_CHANGE && ev.op != RFKILL_OP_CHANGE_ALL)
return -EINVAL;
if (ev.type >= NUM_RFKILL_TYPES)
return -EINVAL;
mutex_lock(&rfkill_global_mutex);
if (ev.op == RFKILL_OP_CHANGE_ALL)
switch (ev.op) {
case RFKILL_OP_CHANGE_ALL:
rfkill_update_global_state(ev.type, ev.soft);
list_for_each_entry(rfkill, &rfkill_list, node) {
if (rfkill->idx != ev.idx && ev.op != RFKILL_OP_CHANGE_ALL)
continue;
if (rfkill->type != ev.type && ev.type != RFKILL_TYPE_ALL)
continue;
rfkill_set_block(rfkill, ev.soft);
list_for_each_entry(rfkill, &rfkill_list, node)
if (rfkill->type == ev.type ||
ev.type == RFKILL_TYPE_ALL)
rfkill_set_block(rfkill, ev.soft);
ret = 0;
break;
case RFKILL_OP_CHANGE:
list_for_each_entry(rfkill, &rfkill_list, node)
if (rfkill->idx == ev.idx &&
(rfkill->type == ev.type ||
ev.type == RFKILL_TYPE_ALL))
rfkill_set_block(rfkill, ev.soft);
ret = 0;
break;
default:
ret = -EINVAL;
break;
}
mutex_unlock(&rfkill_global_mutex);
return count;
return ret ?: count;
}
static int rfkill_fop_release(struct inode *inode, struct file *file)