i2c: imx: Fix external abort on interrupt in exit paths

If interrupt comes late, during probe error path or device remove (could
be triggered with CONFIG_DEBUG_SHIRQ), the interrupt handler
i2c_imx_isr() will access registers with the clock being disabled.  This
leads to external abort on non-linefetch on Toradex Colibri VF50 module
(with Vybrid VF5xx):

    Unhandled fault: external abort on non-linefetch (0x1008) at 0x8882d003
    Internal error: : 1008 [#1] ARM
    Modules linked in:
    CPU: 0 PID: 1 Comm: swapper Not tainted 5.7.0 #607
    Hardware name: Freescale Vybrid VF5xx/VF6xx (Device Tree)
      (i2c_imx_isr) from [<8017009c>] (free_irq+0x25c/0x3b0)
      (free_irq) from [<805844ec>] (release_nodes+0x178/0x284)
      (release_nodes) from [<80580030>] (really_probe+0x10c/0x348)
      (really_probe) from [<80580380>] (driver_probe_device+0x60/0x170)
      (driver_probe_device) from [<80580630>] (device_driver_attach+0x58/0x60)
      (device_driver_attach) from [<805806bc>] (__driver_attach+0x84/0xc0)
      (__driver_attach) from [<8057e228>] (bus_for_each_dev+0x68/0xb4)
      (bus_for_each_dev) from [<8057f3ec>] (bus_add_driver+0x144/0x1ec)
      (bus_add_driver) from [<80581320>] (driver_register+0x78/0x110)
      (driver_register) from [<8010213c>] (do_one_initcall+0xa8/0x2f4)
      (do_one_initcall) from [<80c0100c>] (kernel_init_freeable+0x178/0x1dc)
      (kernel_init_freeable) from [<80807048>] (kernel_init+0x8/0x110)
      (kernel_init) from [<80100114>] (ret_from_fork+0x14/0x20)

Additionally, the i2c_imx_isr() could wake up the wait queue
(imx_i2c_struct->queue) before its initialization happens.

The resource-managed framework should not be used for interrupt handling,
because the resource will be released too late - after disabling clocks.
The interrupt handler is not prepared for such case.

Fixes: 1c4b6c3bcf30 ("i2c: imx: implement bus recovery")
Cc: <stable@vger.kernel.org>
Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Acked-by: Oleksij Rempel <o.rempel@pengutronix.de>
Signed-off-by: Wolfram Sang <wsa@kernel.org>

diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
index 63f4367..c98529c 100644 (file)
--- a/drivers/i2c/busses/i2c-imx.c
+++ b/drivers/i2c/busses/i2c-imx.c
@@ -1169,14 +1169,6 @@ static int i2c_imx_probe(struct platform_device *pdev)
                return ret;
        }
 
-       /* Request IRQ */
-       ret = devm_request_irq(&pdev->dev, irq, i2c_imx_isr, IRQF_SHARED,
-                               pdev->name, i2c_imx);
-       if (ret) {
-               dev_err(&pdev->dev, "can't claim irq %d\n", irq);
-               goto clk_disable;
-       }
-
        /* Init queue */
        init_waitqueue_head(&i2c_imx->queue);
 
@@ -1195,6 +1187,14 @@ static int i2c_imx_probe(struct platform_device *pdev)
        if (ret < 0)
                goto rpm_disable;
 
+       /* Request IRQ */
+       ret = request_threaded_irq(irq, i2c_imx_isr, NULL, IRQF_SHARED,
+                                  pdev->name, i2c_imx);
+       if (ret) {
+               dev_err(&pdev->dev, "can't claim irq %d\n", irq);
+               goto rpm_disable;
+       }
+
        /* Set up clock divider */
        i2c_imx->bitrate = I2C_MAX_STANDARD_MODE_FREQ;
        ret = of_property_read_u32(pdev->dev.of_node,
@@ -1237,13 +1237,12 @@ static int i2c_imx_probe(struct platform_device *pdev)
 
 clk_notifier_unregister:
        clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb);
+       free_irq(irq, i2c_imx);
 rpm_disable:
        pm_runtime_put_noidle(&pdev->dev);
        pm_runtime_disable(&pdev->dev);
        pm_runtime_set_suspended(&pdev->dev);
        pm_runtime_dont_use_autosuspend(&pdev->dev);
-
-clk_disable:
        clk_disable_unprepare(i2c_imx->clk);
        return ret;
 }
@@ -1251,7 +1250,7 @@ clk_disable:
 static int i2c_imx_remove(struct platform_device *pdev)
 {
        struct imx_i2c_struct *i2c_imx = platform_get_drvdata(pdev);
-       int ret;
+       int irq, ret;
 
        ret = pm_runtime_get_sync(&pdev->dev);
        if (ret < 0)
@@ -1271,6 +1270,9 @@ static int i2c_imx_remove(struct platform_device *pdev)
        imx_i2c_write_reg(0, i2c_imx, IMX_I2C_I2SR);
 
        clk_notifier_unregister(i2c_imx->clk, &i2c_imx->clk_change_nb);
+       irq = platform_get_irq(pdev, 0);
+       if (irq >= 0)
+               free_irq(irq, i2c_imx);
        clk_disable_unprepare(i2c_imx->clk);
 
        pm_runtime_put_noidle(&pdev->dev);