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mac80211: allow hardware scan to fall back to software

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In some cases, like in the rsi driver hardware scan offload, there
may be scenarios in which hardware scan might not be available or
desirable.

Allow drivers to cope with this by letting them fall back to software
scan by returning the special value 1 from the hardware scan method.

Requested-by: Sushant Kumar Mishra <sushant2k1513@gmail.com>
Requested-by: Siva Rebbagondla <siva.rebbagondla@redpinesignals.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg
2018-10-18 10:35:47 +02:00
parent c0a0189d82
commit e9da68ddea
2 changed files with 23 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
net/mac80211/scan.c
View File

@@ -356,7 +356,7 @@ static bool ieee80211_prep_hw_scan(struct ieee80211_local *local)
static void __ieee80211_scan_completed(struct ieee80211_hw *hw, bool aborted)
{
struct ieee80211_local *local = hw_to_local(hw);
bool hw_scan = local->ops->hw_scan;
bool hw_scan = test_bit(SCAN_HW_SCANNING, &local->scanning);
bool was_scanning = local->scanning;
struct cfg80211_scan_request *scan_req;
struct ieee80211_sub_if_data *scan_sdata;
@@ -606,6 +606,7 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
struct cfg80211_scan_request *req)
{
struct ieee80211_local *local = sdata->local;
bool hw_scan = local->ops->hw_scan;
int rc;
lockdep_assert_held(&local->mtx);
@@ -620,7 +621,8 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
return 0;
}
if (local->ops->hw_scan) {
again:
if (hw_scan) {
u8 *ies;
local->hw_scan_ies_bufsize = local->scan_ies_len + req->ie_len;
@@ -679,7 +681,7 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
else
memcpy(local->scan_addr, sdata->vif.addr, ETH_ALEN);
if (local->ops->hw_scan) {
if (hw_scan) {
__set_bit(SCAN_HW_SCANNING, &local->scanning);
} else if ((req->n_channels == 1) &&
(req->channels[0] == local->_oper_chandef.chan)) {
@@ -722,7 +724,7 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
ieee80211_recalc_idle(local);
if (local->ops->hw_scan) {
if (hw_scan) {
WARN_ON(!ieee80211_prep_hw_scan(local));
rc = drv_hw_scan(local, sdata, local->hw_scan_req);
} else {
@@ -740,6 +742,18 @@ static int __ieee80211_start_scan(struct ieee80211_sub_if_data *sdata,
RCU_INIT_POINTER(local->scan_sdata, NULL);
}
if (hw_scan && rc == 1) {
/*
* we can't fall back to software for P2P-GO
* as it must update NoA etc.
*/
if (ieee80211_vif_type_p2p(&sdata->vif) ==
NL80211_IFTYPE_P2P_GO)
return -EOPNOTSUPP;
hw_scan = false;
goto again;
}
return rc;
}