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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/net/wireless/ath/wil6210/pm.c
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@@ -1,18 +1,7 @@
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+// SPDX-License-Identifier: ISC
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 /*
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  * Copyright (c) 2014,2017 Qualcomm Atheros, Inc.
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- * Copyright (c) 2018, The Linux Foundation. All rights reserved.
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- *
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- * Permission to use, copy, modify, and/or distribute this software for any
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- * purpose with or without fee is hereby granted, provided that the above
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- * copyright notice and this permission notice appear in all copies.
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- *
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- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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- * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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- * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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+ * Copyright (c) 2018-2019, The Linux Foundation. All rights reserved.
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  */
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 #include "wil6210.h"
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@@ -26,7 +15,7 @@
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 	int i;
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 	mutex_lock(&wil->vif_mutex);
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-	for (i = 0; i < wil->max_vifs; i++) {
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+	for (i = 0; i < GET_MAX_VIFS(wil); i++) {
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 		struct wil6210_vif *vif = wil->vifs[i];
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 		if (vif && test_bit(wil_vif_fwconnected, vif->status))
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@@ -40,7 +29,7 @@
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 	int i;
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 	mutex_lock(&wil->vif_mutex);
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-	for (i = 0; i < wil->max_vifs; i++) {
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+	for (i = 0; i < GET_MAX_VIFS(wil); i++) {
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 		struct wil6210_vif *vif = wil->vifs[i];
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 		if (vif)
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@@ -123,7 +112,7 @@
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 	/* interface is running */
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 	mutex_lock(&wil->vif_mutex);
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-	for (i = 0; i < wil->max_vifs; i++) {
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+	for (i = 0; i < GET_MAX_VIFS(wil); i++) {
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 		struct wil6210_vif *vif = wil->vifs[i];
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 		if (!vif)
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@@ -190,19 +179,23 @@
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 static int wil_suspend_keep_radio_on(struct wil6210_priv *wil)
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 {
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 	int rc = 0;
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-	unsigned long start, data_comp_to;
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+	unsigned long data_comp_to;
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 	wil_dbg_pm(wil, "suspend keep radio on\n");
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 	/* Prevent handling of new tx and wmi commands */
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-	set_bit(wil_status_suspending, wil->status);
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-	if (test_bit(wil_status_collecting_dumps, wil->status)) {
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-		/* Device collects crash dump, cancel the suspend */
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-		wil_dbg_pm(wil, "reject suspend while collecting crash dump\n");
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-		clear_bit(wil_status_suspending, wil->status);
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+	rc = down_write_trylock(&wil->mem_lock);
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+	if (!rc) {
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+		wil_err(wil,
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+			"device is busy. down_write_trylock failed, returned (0x%x)\n",
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+			rc);
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 		wil->suspend_stats.rejected_by_host++;
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 		return -EBUSY;
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 	}
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+
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+	set_bit(wil_status_suspending, wil->status);
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+	up_write(&wil->mem_lock);
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+
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 	wil_pm_stop_all_net_queues(wil);
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 	if (!wil_is_tx_idle(wil)) {
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@@ -232,7 +225,6 @@
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 	}
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 	/* Wait for completion of the pending RX packets */
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-	start = jiffies;
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 	data_comp_to = jiffies + msecs_to_jiffies(WIL_DATA_COMPLETION_TO_MS);
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 	if (test_bit(wil_status_napi_en, wil->status)) {
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 		while (!wil->txrx_ops.is_rx_idle(wil)) {
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@@ -311,15 +303,18 @@
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 	wil_dbg_pm(wil, "suspend radio off\n");
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-	set_bit(wil_status_suspending, wil->status);
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-	if (test_bit(wil_status_collecting_dumps, wil->status)) {
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-		/* Device collects crash dump, cancel the suspend */
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-		wil_dbg_pm(wil, "reject suspend while collecting crash dump\n");
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-		clear_bit(wil_status_suspending, wil->status);
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+	rc = down_write_trylock(&wil->mem_lock);
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+	if (!rc) {
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+		wil_err(wil,
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+			"device is busy. down_write_trylock failed, returned (0x%x)\n",
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+			rc);
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 		wil->suspend_stats.rejected_by_host++;
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 		return -EBUSY;
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 	}
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+	set_bit(wil_status_suspending, wil->status);
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+	up_write(&wil->mem_lock);
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+
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 	/* if netif up, hardware is alive, shut it down */
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 	mutex_lock(&wil->vif_mutex);
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 	active_ifaces = wil_has_active_ifaces(wil, true, false);