• Martin Kaiser's avatar
    mfd: fsl-imx25: Clean up irq settings during removal · 18f77393
    Martin Kaiser authored
    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: default avatarMartin Kaiser <martin@kaiser.cx>
    Reviewed-by: default avatarLucas Stach <l.stach@pengutronix.de>
    Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
    18f77393
fsl-imx25-tsadc.c 5.55 KB