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Date:   Thu, 23 Jun 2022 13:42:21 +0100
From:   Paul Cercueil <paul@...pouillou.net>
To:     Arend van Spriel <aspriel@...il.com>,
        Franky Lin <franky.lin@...adcom.com>
Cc:     linux-wireless@...r.kernel.org,
        brcm80211-dev-list.pdl@...adcom.com,
        SHA-cyfmac-dev-list@...ineon.com, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org, Paul Cercueil <paul@...pouillou.net>
Subject: [PATCH v2] brcmfmac: Remove #ifdef guards for PM related functions

Use the new DEFINE_SIMPLE_DEV_PM_OPS() and pm_sleep_ptr() macros to
handle the .suspend/.resume callbacks.

These macros allow the suspend and resume functions to be automatically
dropped by the compiler when CONFIG_SUSPEND is disabled, without having
to use #ifdef guards.

Some other functions not directly called by the .suspend/.resume
callbacks, but still related to PM were also taken outside #ifdef
guards.

The advantage is then that these functions are now always compiled
independently of any Kconfig option, and thanks to that bugs and
regressions are easier to catch.

Signed-off-by: Paul Cercueil <paul@...pouillou.net>
---

Notes:
    v2:
    - Move checks for IS_ENABLED(CONFIG_PM_SLEEP) inside functions to keep
      the calling functions intact.
    - Reword the commit message to explain why this patch is useful.

 .../broadcom/brcm80211/brcmfmac/bcmsdh.c      | 38 +++++++------------
 .../broadcom/brcm80211/brcmfmac/sdio.c        |  5 +--
 .../broadcom/brcm80211/brcmfmac/sdio.h        | 16 --------
 3 files changed, 16 insertions(+), 43 deletions(-)

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
index 9c598ea97499..11ad878a906b 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c
@@ -784,9 +784,11 @@ void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev)
 	sdiodev->txglomsz = sdiodev->settings->bus.sdio.txglomsz;
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int brcmf_sdiod_freezer_attach(struct brcmf_sdio_dev *sdiodev)
 {
+	if (!IS_ENABLED(CONFIG_PM_SLEEP))
+		return 0;
+
 	sdiodev->freezer = kzalloc(sizeof(*sdiodev->freezer), GFP_KERNEL);
 	if (!sdiodev->freezer)
 		return -ENOMEM;
@@ -799,7 +801,7 @@ static int brcmf_sdiod_freezer_attach(struct brcmf_sdio_dev *sdiodev)
 
 static void brcmf_sdiod_freezer_detach(struct brcmf_sdio_dev *sdiodev)
 {
-	if (sdiodev->freezer) {
+	if (IS_ENABLED(CONFIG_PM_SLEEP) && sdiodev->freezer) {
 		WARN_ON(atomic_read(&sdiodev->freezer->freezing));
 		kfree(sdiodev->freezer);
 	}
@@ -833,7 +835,8 @@ static void brcmf_sdiod_freezer_off(struct brcmf_sdio_dev *sdiodev)
 
 bool brcmf_sdiod_freezing(struct brcmf_sdio_dev *sdiodev)
 {
-	return atomic_read(&sdiodev->freezer->freezing);
+	return IS_ENABLED(CONFIG_PM_SLEEP) &&
+		atomic_read(&sdiodev->freezer->freezing);
 }
 
 void brcmf_sdiod_try_freeze(struct brcmf_sdio_dev *sdiodev)
@@ -847,24 +850,16 @@ void brcmf_sdiod_try_freeze(struct brcmf_sdio_dev *sdiodev)
 
 void brcmf_sdiod_freezer_count(struct brcmf_sdio_dev *sdiodev)
 {
-	atomic_inc(&sdiodev->freezer->thread_count);
+	if (IS_ENABLED(CONFIG_PM_SLEEP))
+		atomic_inc(&sdiodev->freezer->thread_count);
 }
 
 void brcmf_sdiod_freezer_uncount(struct brcmf_sdio_dev *sdiodev)
 {
-	atomic_dec(&sdiodev->freezer->thread_count);
-}
-#else
-static int brcmf_sdiod_freezer_attach(struct brcmf_sdio_dev *sdiodev)
-{
-	return 0;
+	if (IS_ENABLED(CONFIG_PM_SLEEP))
+		atomic_dec(&sdiodev->freezer->thread_count);
 }
 
-static void brcmf_sdiod_freezer_detach(struct brcmf_sdio_dev *sdiodev)
-{
-}
-#endif /* CONFIG_PM_SLEEP */
-
 int brcmf_sdiod_remove(struct brcmf_sdio_dev *sdiodev)
 {
 	sdiodev->state = BRCMF_SDIOD_DOWN;
@@ -1136,7 +1131,6 @@ void brcmf_sdio_wowl_config(struct device *dev, bool enabled)
 	brcmf_dbg(SDIO, "WOWL not supported\n");
 }
 
-#ifdef CONFIG_PM_SLEEP
 static int brcmf_ops_sdio_suspend(struct device *dev)
 {
 	struct sdio_func *func;
@@ -1204,11 +1198,9 @@ static int brcmf_ops_sdio_resume(struct device *dev)
 	return ret;
 }
 
-static const struct dev_pm_ops brcmf_sdio_pm_ops = {
-	.suspend	= brcmf_ops_sdio_suspend,
-	.resume		= brcmf_ops_sdio_resume,
-};
-#endif	/* CONFIG_PM_SLEEP */
+static DEFINE_SIMPLE_DEV_PM_OPS(brcmf_sdio_pm_ops,
+				brcmf_ops_sdio_suspend,
+				brcmf_ops_sdio_resume);
 
 static struct sdio_driver brcmf_sdmmc_driver = {
 	.probe = brcmf_ops_sdio_probe,
@@ -1217,9 +1209,7 @@ static struct sdio_driver brcmf_sdmmc_driver = {
 	.id_table = brcmf_sdmmc_ids,
 	.drv = {
 		.owner = THIS_MODULE,
-#ifdef CONFIG_PM_SLEEP
-		.pm = &brcmf_sdio_pm_ops,
-#endif	/* CONFIG_PM_SLEEP */
+		.pm = pm_sleep_ptr(&brcmf_sdio_pm_ops),
 		.coredump = brcmf_dev_coredump,
 	},
 };
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
index 212fbbe1cd7e..58ed6b70f8c5 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.c
@@ -4020,15 +4020,14 @@ brcmf_sdio_probe_attach(struct brcmf_sdio *bus)
 	 */
 	brcmf_sdiod_sgtable_alloc(sdiodev);
 
-#ifdef CONFIG_PM_SLEEP
 	/* wowl can be supported when KEEP_POWER is true and (WAKE_SDIO_IRQ
 	 * is true or when platform data OOB irq is true).
 	 */
-	if ((sdio_get_host_pm_caps(sdiodev->func1) & MMC_PM_KEEP_POWER) &&
+	if (IS_ENABLED(CONFIG_PM_SLEEP) &&
+	    (sdio_get_host_pm_caps(sdiodev->func1) & MMC_PM_KEEP_POWER) &&
 	    ((sdio_get_host_pm_caps(sdiodev->func1) & MMC_PM_WAKE_SDIO_IRQ) ||
 	     (sdiodev->settings->bus.sdio.oob_irq_supported)))
 		sdiodev->bus_if->wowl_supported = true;
-#endif
 
 	if (brcmf_sdio_kso_init(bus)) {
 		brcmf_err("error enabling KSO\n");
diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
index 15d2c02fa3ec..47351ff458ca 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/sdio.h
@@ -346,26 +346,10 @@ int brcmf_sdiod_abort(struct brcmf_sdio_dev *sdiodev, struct sdio_func *func);
 void brcmf_sdiod_sgtable_alloc(struct brcmf_sdio_dev *sdiodev);
 void brcmf_sdiod_change_state(struct brcmf_sdio_dev *sdiodev,
 			      enum brcmf_sdiod_state state);
-#ifdef CONFIG_PM_SLEEP
 bool brcmf_sdiod_freezing(struct brcmf_sdio_dev *sdiodev);
 void brcmf_sdiod_try_freeze(struct brcmf_sdio_dev *sdiodev);
 void brcmf_sdiod_freezer_count(struct brcmf_sdio_dev *sdiodev);
 void brcmf_sdiod_freezer_uncount(struct brcmf_sdio_dev *sdiodev);
-#else
-static inline bool brcmf_sdiod_freezing(struct brcmf_sdio_dev *sdiodev)
-{
-	return false;
-}
-static inline void brcmf_sdiod_try_freeze(struct brcmf_sdio_dev *sdiodev)
-{
-}
-static inline void brcmf_sdiod_freezer_count(struct brcmf_sdio_dev *sdiodev)
-{
-}
-static inline void brcmf_sdiod_freezer_uncount(struct brcmf_sdio_dev *sdiodev)
-{
-}
-#endif /* CONFIG_PM_SLEEP */
 
 int brcmf_sdiod_probe(struct brcmf_sdio_dev *sdiodev);
 int brcmf_sdiod_remove(struct brcmf_sdio_dev *sdiodev);
-- 
2.35.1

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