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Message-ID: <20150609135606.GF32730@opensource.wolfsonmicro.com> Date: Tue, 9 Jun 2015 14:56:06 +0100 From: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com> To: Inha Song <ideal.song@...sung.com> Cc: broonie@...nel.org, lee.jones@...aro.org, alsa-devel@...a-project.org, patches@...nsource.wolfsonmicro.com, sameo@...ux.intel.com, linux-kernel@...r.kernel.org Subject: Re: [alsa-devel] [PATCH] mfd: wm8994: Fix NULL pointer exception on missing pdata On Tue, Jun 09, 2015 at 07:18:32PM +0900, Inha Song wrote: > If we use the dev_get_platdata, pdata can be NULL in DT environments. > Actually, NULL pointer exception is occurs with error messages like this: > > [ 1.226583] Unable to handle kernel NULL pointer dereference at virtual address 00000044 > [ 1.467910] [<c02f1e38>] (wm8994_irq_init) from [<c02f1bd4>] (wm8994_i2c_probe+0x684/0x858) > [ 1.476241] [<c02f1bd4>] (wm8994_i2c_probe) from [<c0371c78>] (i2c_device_probe+0x11c/0x17c) > > In wm8994-core, we already checked wheter platform data is NULL and set the > wm8994->pdata to platform data if platform data is not NULL. > So, we can use wm8994->pdata instead of platform data. > > Signed-off-by: Inha Song <ideal.song@...sung.com> > --- Acked-by: Charles Keepax <ckeepax@...nsource.wolfsonmicro.com> Thanks, Charles -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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