linux-kernel - Re: [PATCH v2 27/45] mfd: ntxec: Use devm_register_power

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Message-ID: <YYuia9KFdi+ETT+I@latitude>
Date:   Wed, 10 Nov 2021 11:43:55 +0100
From:   Jonathan Neuschäfer <j.neuschaefer@....net>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     Jonathan Neuschäfer <j.neuschaefer@....net>,
        Guenter Roeck <linux@...ck-us.net>,
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Subject: Re: [PATCH v2 27/45] mfd: ntxec: Use devm_register_power_handler()

On Mon, Nov 08, 2021 at 02:36:42PM +0300, Dmitry Osipenko wrote:
> 08.11.2021 14:22, Jonathan Neuschäfer пишет:
> > On Sun, Nov 07, 2021 at 08:42:33PM +0300, Dmitry Osipenko wrote:
> > [...]
> >> EC drivers tend to use higher priority in general. Jonathan, could you
> >> please confirm that NTXEC driver is a more preferable restart method
> >> than the watchdog?
> > 
> > Yes. The original firmware uses the NTXEC to restart, and it works well,
> > so I do think it's preferable.
> 
> Thank you, then I'll update the NTXEC patch like this:
> 
> https://github.com/grate-driver/linux/commit/22da3d91f1734d9a0ed036220ad4ea28465af988

I tested again, but sys_off_handler_reboot called a bogus pointer
(probably reboot_prepare_cb). I think it was left uninitialized in
ntxec_probe, which uses devm_kmalloc. I guess we could switch it to
devm_kzalloc:

diff --git a/drivers/mfd/ntxec.c b/drivers/mfd/ntxec.c
index 1f55dfce14308..30364beb4b1d0 100644
--- a/drivers/mfd/ntxec.c
+++ b/drivers/mfd/ntxec.c
@@ -144,7 +144,7 @@ static int ntxec_probe(struct i2c_client *client)
 	const struct mfd_cell *subdevs;
 	size_t n_subdevs;
 
-	ec = devm_kmalloc(&client->dev, sizeof(*ec), GFP_KERNEL);
+	ec = devm_kzalloc(&client->dev, sizeof(*ec), GFP_KERNEL);
 	if (!ec)
 		return -ENOMEM;
 


With that done, it works flawlessly.


Thanks,
Jonathan

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