linux-kernel - Re: [PATCH] hid: Logitech G13 driver 0.0.4

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Date:	Mon, 25 Jan 2010 09:49:39 -0700
From:	"Rick L. Vinyard, Jr." <rvinyard@...nmsu.edu>
To:	"Oliver Neukum" <oliver@...kum.org>
Cc:	linux-kernel@...r.kernel.org, felipe.balbi@...ia.com, pavel@....cz,
	jayakumar.lkml@...il.com, linux-fbdev@...r.kernel.org,
	krzysztof.h1@...pl, akpm@...ux-foundation.org,
	linux-usb@...r.kernel.org, linux-input@...r.kernel.org,
	jkosina@...e.cz, dmitry.torokhov@...il.com
Subject: Re: [PATCH] hid: Logitech G13 driver 0.0.4

Oliver Neukum wrote:
> Am Mittwoch, 20. Januar 2010 21:47:22 schrieb Rick L. Vinyard Jr.:
>> +static ssize_t g13_name_store(struct device *dev,
>> +                             struct device_attribute *attr,
>> +                             const char *buf, size_t count)
>> +{
>> +       struct g13_data *data = dev_get_drvdata(dev);
>> +       size_t limit = count;
>> +       char *end;
>> +
>> +       spin_lock(&data->lock);
>> +
>> +       if (data->name != NULL) {
>> +               kfree(data->name);
>> +               data->name = NULL;
>> +       }
>> +
>> +       end = strpbrk(buf, "\n\r");
>> +       if (end != NULL)
>> +               limit = end - buf;
>> +
>> +       if (end != buf) {
>> +
>> +               if (limit > 100)
>> +                       limit = 100;
>> +
>> +               data->name = kzalloc(limit+1, GFP_KERNEL);
>
> While you hold a spinlock, memory allocations must be done with
> GFP_ATOMIC.
>

Thanks for catching that one. I'll recheck all the rest of the allocs.



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