From: ebiederm@xmission.com (Eric W. Biederman)
To: "Hans J. Koch" <hjk@linutronix.de>
Cc: Greg Kroah-Hartman <gregkh@suse.de>,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [PATCH 5/5] uio: Implement hotunplug support, using libunload
Date: Fri, 24 Sep 2010 10:11:09 -0700 [thread overview]
Message-ID: <m1wrqbcbiq.fsf@fess.ebiederm.org> (raw)
In-Reply-To: <20100924105555.GD1819@silverbox.local> (Hans J. Koch's message of "Fri, 24 Sep 2010 12:55:56 +0200")
"Hans J. Koch" <hjk@linutronix.de> writes:
> On Mon, Sep 20, 2010 at 12:24:19AM -0700, Eric W. Biederman wrote:
>>
>> }
>>
>> static ssize_t uio_read(struct file *filep, char __user *buf,
>> size_t count, loff_t *ppos)
>> {
>> struct uio_listener *listener = filep->private_data;
>> - struct uio_device *idev = listener->dev;
>> + struct uio_device *idev = listener_idev(listener);
>> DECLARE_WAITQUEUE(wait, current);
>> ssize_t retval;
>> s32 event_count;
>>
>> - if (!idev->info->irq)
>> + if (!unload_trylock(&idev->unload))
>> return -EIO;
>>
>> + retval = -EIO;
>> + if (!idev->info->irq)
>> + goto out;
>> +
>> + retval = -EIO;
>> if (count != sizeof(s32))
>> - return -EINVAL;
>> + goto out;
>
> No. uio_read() should return -EINVAL if count != sizeof(s32). This is
> simply wrong userspace code that passes in an illegal value, so it's
> not an IO error but an invalid parameter.
> BTW, you use -EINVAL in the same situation in uio_write()...
Apologies. That was a typo. It was my intention to preserve the
existing return codes.
Eric
next prev parent reply other threads:[~2010-09-24 17:11 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-09-14 18:35 [PATCH 0/5] Uio enhancements Eric W. Biederman
2010-09-14 18:36 ` [PATCH 1/5] uio: Fix lack of locking in init_uio_class Eric W. Biederman
2010-09-17 20:32 ` Thomas Gleixner
2010-09-17 20:49 ` Hans J. Koch
2010-09-14 18:36 ` [PATCH 2/5] uio: Don't clear driver data Eric W. Biederman
2010-09-17 20:33 ` Thomas Gleixner
2010-09-17 20:50 ` Hans J. Koch
2010-09-14 18:37 ` [PATCH 3/5] uio: Cleanup irq handling Eric W. Biederman
2010-09-17 20:34 ` Thomas Gleixner
2010-09-17 20:51 ` Hans J. Koch
2010-09-14 18:38 ` [PATCH 4/5] uio: Support 2^MINOR_BITS minors Eric W. Biederman
2010-09-17 20:36 ` Thomas Gleixner
2010-09-17 20:57 ` Hans J. Koch
2010-09-17 21:09 ` Greg KH
2010-09-21 21:08 ` Greg KH
2010-09-21 21:38 ` Thomas Gleixner
2010-09-21 21:56 ` Greg KH
2010-09-21 22:21 ` Eric W. Biederman
2010-09-21 22:26 ` Thomas Gleixner
2010-09-14 18:38 ` [PATCH 5/5] uio: Statically allocate uio_class and use class .dev_attrs Eric W. Biederman
2010-09-17 20:37 ` Thomas Gleixner
2010-09-17 20:57 ` Hans J. Koch
2010-09-17 20:59 ` [PATCH 0/5] Uio enhancements Hans J. Koch
2010-09-20 7:19 ` [PATCH 0/5] uio hotplug support Eric W. Biederman
2010-09-20 7:21 ` [PATCH 1/5] uio: Simplify the lifetime logic of struct uio_device Eric W. Biederman
2010-09-20 7:21 ` [PATCH 2/5] uio: Kill unused vma_count Eric W. Biederman
2010-09-20 7:23 ` [PATCH 3/5] uio: Remove unused uio_info mmap method Eric W. Biederman
2010-09-20 7:23 ` [PATCH 4/5] libunload: A library to help remove open files Eric W. Biederman
2010-09-20 7:24 ` [PATCH 5/5] uio: Implement hotunplug support, using libunload Eric W. Biederman
2010-09-24 10:55 ` Hans J. Koch
2010-09-24 17:11 ` Eric W. Biederman [this message]
2010-09-25 2:06 ` [PATCH] uio: Fix accidentally changed return value in uio_read Eric W. Biederman
2010-09-24 10:45 ` [PATCH 0/5] uio hotplug support Hans J. Koch
2010-09-24 17:14 ` Eric W. Biederman
2010-09-24 17:31 ` Hans J. Koch
2010-09-24 18:38 ` Eric W. Biederman
2010-09-25 0:05 ` Eric W. Biederman
2010-09-25 0:33 ` Greg KH
2010-09-25 1:54 ` Eric W. Biederman
2010-09-26 19:21 ` Greg KH
2010-09-26 22:46 ` [PATCH 1/5] uio: Simplify the lifetime logic of struct uio_device Eric W. Biederman
2010-09-30 22:00 ` Hans J. Koch
2010-09-26 22:47 ` [PATCH 2/5] uio: Kill unused vma_count Eric W. Biederman
2010-09-26 22:48 ` [PATCH 3/5] uio: Remove unused uio_info mmap method Eric W. Biederman
2010-10-04 9:26 ` Hans J. Koch
2010-09-26 22:48 ` [PATCH 4/5] libunload: A library to help remove open files Eric W. Biederman
2010-10-04 9:56 ` Hans J. Koch
2010-09-26 22:49 ` [PATCH 5/5] uio: Implement hotunplug support, using libunload Eric W. Biederman
2010-10-04 10:47 ` Hans J. Koch
2010-10-04 12:34 ` Hans J. Koch
2010-10-04 18:19 ` Eric W. Biederman
2010-10-04 18:52 ` Hans J. Koch
2010-09-26 22:49 ` [PATCH 6/5] uio: Fix accidentally changed return value in uio_read Eric W. Biederman
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