staging: wfx: fix init/remove vs IRQ race

Current code races in init/exit with interrupt handlers. This is noticed
by the warning below. Fix it by using devres for ordering allocations and
IRQ de/registration.

WARNING: CPU: 0 PID: 827 at drivers/staging/wfx/bus_spi.c:142 wfx_spi_irq_handler+0x5c/0x64 [wfx]
race condition in driver init/deinit

Cc: stable@vger.kernel.org
Fixes: 0096214a59a7 ("staging: wfx: add support for I/O access")
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Reviewed-by: Jérôme Pouiller <jerome.pouiller@silabs.com>
Link: https://lore.kernel.org/r/f0c66cbb3110c2736cd4357c753fba8c14ee3aee.1581416843.git.mirq-linux@rere.qmqm.pl
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/wfx/bus_sdio.c b/drivers/staging/wfx/bus_sdio.c
index f890116..5450bd5 100644 (file)
--- a/drivers/staging/wfx/bus_sdio.c
+++ b/drivers/staging/wfx/bus_sdio.c
@@ -200,25 +200,23 @@ static int wfx_sdio_probe(struct sdio_func *func,
        if (ret)
                goto err0;
 
-       ret = wfx_sdio_irq_subscribe(bus);
-       if (ret)
-               goto err1;
-
        bus->core = wfx_init_common(&func->dev, &wfx_sdio_pdata,
                                    &wfx_sdio_hwbus_ops, bus);
        if (!bus->core) {
                ret = -EIO;
-               goto err2;
+               goto err1;
        }
 
+       ret = wfx_sdio_irq_subscribe(bus);
+       if (ret)
+               goto err1;
+
        ret = wfx_probe(bus->core);
        if (ret)
-               goto err3;
+               goto err2;
 
        return 0;
 
-err3:
-       wfx_free_common(bus->core);
 err2:
        wfx_sdio_irq_unsubscribe(bus);
 err1:
@@ -234,7 +232,6 @@ static void wfx_sdio_remove(struct sdio_func *func)
        struct wfx_sdio_priv *bus = sdio_get_drvdata(func);
 
        wfx_release(bus->core);
-       wfx_free_common(bus->core);
        wfx_sdio_irq_unsubscribe(bus);
        sdio_claim_host(func);
        sdio_disable_func(func);

diff --git a/drivers/staging/wfx/bus_spi.c b/drivers/staging/wfx/bus_spi.c
index 40bc330..605ad74 100644 (file)
--- a/drivers/staging/wfx/bus_spi.c
+++ b/drivers/staging/wfx/bus_spi.c
@@ -154,6 +154,11 @@ static void wfx_spi_request_rx(struct work_struct *work)
        wfx_bh_request_rx(bus->core);
 }
 
+static void wfx_flush_irq_work(void *w)
+{
+       flush_work(w);
+}
+
 static size_t wfx_spi_align_size(void *priv, size_t size)
 {
        // Most of SPI controllers avoid DMA if buffer size is not 32bit aligned
@@ -207,22 +212,23 @@ static int wfx_spi_probe(struct spi_device *func)
                udelay(2000);
        }
 
-       ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
-                              IRQF_TRIGGER_RISING, "wfx", bus);
-       if (ret)
-               return ret;
-
        INIT_WORK(&bus->request_rx, wfx_spi_request_rx);
        bus->core = wfx_init_common(&func->dev, &wfx_spi_pdata,
                                    &wfx_spi_hwbus_ops, bus);
        if (!bus->core)
                return -EIO;
 
-       ret = wfx_probe(bus->core);
+       ret = devm_add_action_or_reset(&func->dev, wfx_flush_irq_work,
+                                      &bus->request_rx);
        if (ret)
-               wfx_free_common(bus->core);
+               return ret;
 
-       return ret;
+       ret = devm_request_irq(&func->dev, func->irq, wfx_spi_irq_handler,
+                              IRQF_TRIGGER_RISING, "wfx", bus);
+       if (ret)
+               return ret;
+
+       return wfx_probe(bus->core);
 }
 
 static int wfx_spi_remove(struct spi_device *func)
@@ -230,11 +236,6 @@ static int wfx_spi_remove(struct spi_device *func)
        struct wfx_spi_priv *bus = spi_get_drvdata(func);
 
        wfx_release(bus->core);
-       wfx_free_common(bus->core);
-       // A few IRQ will be sent during device release. Hopefully, no IRQ
-       // should happen after wdev/wvif are released.
-       devm_free_irq(&func->dev, func->irq, bus);
-       flush_work(&bus->request_rx);
        return 0;
 }
 

diff --git a/drivers/staging/wfx/main.c b/drivers/staging/wfx/main.c
index 84adad6..76b2ff7 100644 (file)
--- a/drivers/staging/wfx/main.c
+++ b/drivers/staging/wfx/main.c
@@ -262,6 +262,16 @@ static int wfx_send_pdata_pds(struct wfx_dev *wdev)
        return ret;
 }
 
+static void wfx_free_common(void *data)
+{
+       struct wfx_dev *wdev = data;
+
+       mutex_destroy(&wdev->rx_stats_lock);
+       mutex_destroy(&wdev->conf_mutex);
+       wfx_tx_queues_deinit(wdev);
+       ieee80211_free_hw(wdev->hw);
+}
+
 struct wfx_dev *wfx_init_common(struct device *dev,
                                const struct wfx_platform_data *pdata,
                                const struct hwbus_ops *hwbus_ops,
@@ -332,15 +342,10 @@ struct wfx_dev *wfx_init_common(struct device *dev,
        wfx_init_hif_cmd(&wdev->hif_cmd);
        wfx_tx_queues_init(wdev);
 
-       return wdev;
-}
+       if (devm_add_action_or_reset(dev, wfx_free_common, wdev))
+               return NULL;
 
-void wfx_free_common(struct wfx_dev *wdev)
-{
-       mutex_destroy(&wdev->rx_stats_lock);
-       mutex_destroy(&wdev->conf_mutex);
-       wfx_tx_queues_deinit(wdev);
-       ieee80211_free_hw(wdev->hw);
+       return wdev;
 }
 
 int wfx_probe(struct wfx_dev *wdev)

diff --git a/drivers/staging/wfx/main.h b/drivers/staging/wfx/main.h
index 875f8c2..9c94100 100644 (file)
--- a/drivers/staging/wfx/main.h
+++ b/drivers/staging/wfx/main.h
@@ -34,7 +34,6 @@ struct wfx_dev *wfx_init_common(struct device *dev,
                                const struct wfx_platform_data *pdata,
                                const struct hwbus_ops *hwbus_ops,
                                void *hwbus_priv);
-void wfx_free_common(struct wfx_dev *wdev);
 
 int wfx_probe(struct wfx_dev *wdev);
 void wfx_release(struct wfx_dev *wdev);