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qcacmn: Access scan_req_q under lock

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Currently, list empty checks for scan_req_q is done outside the lock.
This is causing synchronization issue during scan and SSR/vdev delete
in parallel.

To avoid this, check for scan_req_q empty inside the lock.

This change also updates the return type of
wlan_schedule_scan_start_request to QDF_STATUS, which is expected by
caller API.

Change-Id: I8b6febdd98af7856fb047b1c9d852e4944a137b5
CRs-Fixed: 2763173
This commit is contained in:
Bapiraju Alla
2020-08-26 19:23:05 +05:30
committed by snandini
parent 09a17690e8
commit cc025bf48c
1 changed files with 19 additions and 6 deletions
Download Patch File Download Diff File Expand all files Collapse all files

25
os_if/linux/scan/src/wlan_cfg80211_scan.c
View File

@@ -658,9 +658,9 @@ wlan_copy_bssid_scan_request(struct scan_start_request *scan_req,
* Schedule scan start request and enqueue scan request in the global scan
* list. This list stores the active scan request information.
*
* Return: 0 on success, error number otherwise
* Return: QDF_STATUS
*/
static int
static QDF_STATUS
wlan_schedule_scan_start_request(struct wlan_objmgr_pdev *pdev,
struct cfg80211_scan_request *req,
uint8_t source,
@@ -674,7 +674,7 @@ wlan_schedule_scan_start_request(struct wlan_objmgr_pdev *pdev,
scan_req = qdf_mem_malloc(sizeof(*scan_req));
if (!scan_req) {
ucfg_scm_scan_free_scan_request_mem(scan_start_req);
return -ENOMEM;
return QDF_STATUS_E_NOMEM;
}
/* Get NL global context from objmgr*/
@@ -707,10 +707,9 @@ wlan_schedule_scan_start_request(struct wlan_objmgr_pdev *pdev,
osif_rl_debug("Failed to enqueue Scan Req as max scan %d already queued",
qdf_list_size(&osif_scan->scan_req_q));
qdf_mem_free(scan_req);
return -EINVAL;
}
return 0;
return status;
}
/**
@@ -748,12 +747,13 @@ static QDF_STATUS wlan_scan_request_dequeue(
}
scan_priv = osif_ctx->osif_scan;
qdf_mutex_acquire(&scan_priv->scan_req_q_lock);
if (qdf_list_empty(&scan_priv->scan_req_q)) {
osif_info("Scan List is empty");
qdf_mutex_release(&scan_priv->scan_req_q_lock);
return QDF_STATUS_E_FAILURE;
}
qdf_mutex_acquire(&scan_priv->scan_req_q_lock);
if (QDF_STATUS_SUCCESS !=
qdf_list_peek_front(&scan_priv->scan_req_q, &next_node)) {
qdf_mutex_release(&scan_priv->scan_req_q_lock);
@@ -1085,9 +1085,11 @@ static void wlan_cfg80211_scan_done_callback(
event->reason, unique_bss_count);
allow_suspend:
osif_priv = wlan_pdev_get_ospriv(pdev);
qdf_mutex_acquire(&osif_priv->osif_scan->scan_req_q_lock);
if (qdf_list_empty(&osif_priv->osif_scan->scan_req_q)) {
struct wlan_objmgr_psoc *psoc;
qdf_mutex_release(&osif_priv->osif_scan->scan_req_q_lock);
qdf_runtime_pm_allow_suspend(
&osif_priv->osif_scan->runtime_pm_lock);
@@ -1104,6 +1106,8 @@ allow_suspend:
wlan_scan_acquire_wake_lock_timeout(psoc,
&osif_priv->osif_scan->scan_wake_lock,
SCAN_WAKE_LOCK_CONNECT_DURATION);
} else {
qdf_mutex_release(&osif_priv->osif_scan->scan_req_q_lock);
}
}
@@ -1381,12 +1385,15 @@ int wlan_cfg80211_scan(struct wlan_objmgr_vdev *vdev,
* is not empty, and the simultaneous scan is disabled, dont allow 2nd
* scan.
*/
qdf_mutex_acquire(&osif_priv->osif_scan->scan_req_q_lock);
if (!wlan_cfg80211_allow_simultaneous_scan(psoc) &&
!qdf_list_empty(&osif_priv->osif_scan->scan_req_q) &&
opmode != QDF_SAP_MODE) {
qdf_mutex_release(&osif_priv->osif_scan->scan_req_q_lock);
osif_err("Simultaneous scan disabled, reject scan");
return -EBUSY;
}
qdf_mutex_release(&osif_priv->osif_scan->scan_req_q_lock);
req = qdf_mem_malloc(sizeof(*req));
if (!req)
@@ -1619,12 +1626,18 @@ int wlan_cfg80211_scan(struct wlan_objmgr_vdev *vdev,
qdf_status = wlan_schedule_scan_start_request(pdev, request,
params->source, req);
if (QDF_IS_STATUS_ERROR(qdf_status)) {
qdf_mutex_acquire(&osif_priv->osif_scan->scan_req_q_lock);
if (qdf_list_empty(&osif_priv->osif_scan->scan_req_q)) {
qdf_mutex_release(
&osif_priv->osif_scan->scan_req_q_lock);
qdf_runtime_pm_allow_suspend(
&osif_priv->osif_scan->runtime_pm_lock);
wlan_scan_release_wake_lock(
psoc,
&osif_priv->osif_scan->scan_wake_lock);
} else {
qdf_mutex_release(
&osif_priv->osif_scan->scan_req_q_lock);
}
}