linux-kernel - Re: drivers/misc/apds990x.c: might_sleep operation in interrupt handler

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Message-ID: <CADKZ3FLSWmOQL5Jm1G=yrOHDr8zfSCoqjwY3n-FAHq06xbE1ng@mail.gmail.com>
Date:	Wed, 1 Aug 2012 19:46:08 +0400
From:	Denis Yefremov <yefremov.denis@...il.com>
To:	Greg Kroah-Hartman <gregkh@...e.de>
Cc:	Axel Lin <axel.lin@...il.com>, Arnd Bergmann <arnd@...db.de>,
	linux-kernel@...r.kernel.org, ldv-project@...ras.ru
Subject: Re: drivers/misc/apds990x.c: might_sleep operation in interrupt handler

Sorry. My mistake. In this case it seems that sleep functions can
be called from apds990x_irq, since interrupt line is disabled globally
(because of IRQF_ONESHOT). And nothing bad will happen if
you know that device can be blocked for relatively long time.

2012/7/31 Denis Yefremov <yefremov.denis@...il.com>:
> Interrupt handler apds990x_irq in APDS990x sensor driver
> invokes mutex_lock  that is might sleep operation.
>
> Found by Linux Driver Verification project (linuxtesting.org)
> within my participation in the GSoC 2012 program.
>
>
> static irqreturn_t apds990x_irq(int irq, void *data)
> {
>         struct apds990x_chip *chip = data;
>         u8 status;
>
>         apds990x_read_byte(chip, APDS990X_STATUS, &status);
>         apds990x_ack_int(chip, status);
>
>         mutex_lock(&chip->mutex);
> ...
> }
>
> static int __devinit apds990x_probe(struct i2c_client *client,
>                                 const struct i2c_device_id *id)
> {
> ...
>         err = request_threaded_irq(client->irq, NULL,
>                                 apds990x_irq,
>                                 IRQF_TRIGGER_FALLING | IRQF_TRIGGER_LOW |
>                                 IRQF_ONESHOT,
>                                 "apds990x", chip);
> ...
> }
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