This is a note to let you know that I've just added the patch titled

mfd: fsl-imx25: Clean up irq settings during removal

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: mfd-fsl-imx25-clean-up-irq-settings-during-removal.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From 18f77393796848e68909e65d692c1d1436f06e06 Mon Sep 17 00:00:00 2001

From: Martin Kaiser martin@kaiser.cx Date: Tue, 17 Oct 2017 22:53:08 +0200 Subject: mfd: fsl-imx25: Clean up irq settings during removal

From: Martin Kaiser martin@kaiser.cx

commit 18f77393796848e68909e65d692c1d1436f06e06 upstream.

When fsl-imx25-tsadc is compiled as a module, loading, unloading and reloading the module will lead to a crash.

Unable to handle kernel paging request at virtual address bf005430 [<c004df6c>] (irq_find_matching_fwspec) from [<c028d5ec>] (of_irq_get+0x58/0x74) [<c028d594>] (of_irq_get) from [<c01ff970>] (platform_get_irq+0x48/0xc8) [<c01ff928>] (platform_get_irq) from [<bf00e33c>] (mx25_tsadc_probe+0x220/0x2f4 [fsl_imx25_tsadc])

irq_find_matching_fwspec() loops over all registered irq domains. The irq domain is still registered from last time the module was loaded but the pointer to its operations is invalid after the module was unloaded.

Add a removal function which clears the irq handler and removes the irq domain. With this cleanup in place, it's possible to unload and reload the module.

Signed-off-by: Martin Kaiser martin@kaiser.cx Reviewed-by: Lucas Stach l.stach@pengutronix.de Signed-off-by: Lee Jones lee.jones@linaro.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- drivers/mfd/fsl-imx25-tsadc.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)

--- a/drivers/mfd/fsl-imx25-tsadc.c +++ b/drivers/mfd/fsl-imx25-tsadc.c @@ -183,6 +183,19 @@ static int mx25_tsadc_probe(struct platf return 0; }

+static int mx25_tsadc_remove(struct platform_device *pdev) +{ + struct mx25_tsadc *tsadc = platform_get_drvdata(pdev); + int irq = platform_get_irq(pdev, 0); + + if (irq) { + irq_set_chained_handler_and_data(irq, NULL, NULL); + irq_domain_remove(tsadc->domain); + } + + return 0; +} + static const struct of_device_id mx25_tsadc_ids[] = { { .compatible = "fsl,imx25-tsadc" }, { /* Sentinel */ } @@ -194,6 +207,7 @@ static struct platform_driver mx25_tsadc .of_match_table = of_match_ptr(mx25_tsadc_ids), }, .probe = mx25_tsadc_probe, + .remove = mx25_tsadc_remove, }; module_platform_driver(mx25_tsadc_driver);

Patches currently in stable-queue which might be from martin@kaiser.cx are

queue-4.9/mfd-fsl-imx25-clean-up-irq-settings-during-removal.patch