linux-kernel - Re: [PATCH v4] usb: core: Add "quirks" parameter for usbcore

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Date:   Wed, 28 Feb 2018 08:31:16 -0800
From:   Matthew Wilcox <willy@...radead.org>
To:     Kai Heng Feng <kai.heng.feng@...onical.com>
Cc:     gregkh@...uxfoundation.org, oneukum@...e.com, corbet@....net,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-usb@...r.kernel.org
Subject: Re: [PATCH v4] usb: core: Add "quirks" parameter for usbcore

On Thu, Mar 01, 2018 at 12:01:40AM +0800, Kai Heng Feng wrote:
> > Also, you won't need to use a linked list for this; you can just allocate
> > an array of quirks.
> 
> I use linked list because the total quirks number is known after the entire
> string gets parsed.
> Do you suggest that I should just alloc a predefined number (like 16) quirk
> entries, instead of doing it dynamically?

I'd just do:

	unsigned int nr = 1;
	for (i = 0; i < len; i++)
		if (str[i] == ',')
			nr++;
	kcalloc(nr, sizeof(struct), GFP_KERNEL);