linux-kernel - Re: [RFC PATCHv5 4/7] HSI: hsi_char: Add HSI char device driver

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 22 Jun 2011 21:37:44 +0200
From:	Sjur Brændeland <sjur.brandeland@...ricsson.com>
To:	Carlos Chinea <carlos.chinea@...ia.com>, sjurbren@...il.com
Cc:	Andras Domokos <andras.domokos@...ia.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
	Linus Walleij <linus.walleij@...aro.org>
Subject: Re: [RFC PATCHv5 4/7] HSI: hsi_char: Add HSI char device driver

Hi Carlos,

...
>+static ssize_t hsc_read(struct file *file, char __user *buf, size_t len,
>+						loff_t *ppos __maybe_unused)
>+{
...
>+	ret = hsi_async_read(channel->cl, msg);
>+
>+	ret = wait_event_interruptible(channel->rx_wait,
>+					!list_empty(&channel->rx_msgs_queue));
...

>+}
>+
>+static ssize_t hsc_write(struct file *file, const char __user *buf, size_t len,
>+						loff_t *ppos __maybe_unused)
>+{
>+	ret = hsi_async_write(channel->cl, msg);
>+	if (ret < 0)
>+		goto out;
>+
>+	ret = wait_event_interruptible(channel->tx_wait,
>+					!list_empty(&channel->tx_msgs_queue));

I would really like to see support for non-blocking read/write operation here.

...
>+
>+static const struct file_operations hsc_fops = {
>+	.owner		= THIS_MODULE,
>+	.read		= hsc_read,
>+	.write		= hsc_write,
>+	.unlocked_ioctl	= hsc_ioctl,
>+	.open		= hsc_open,
>+	.release	= hsc_release,
>+};

No poll?
Currently we do bulk read/write operations upon modem-crash or firmware upload,
and would perfeer to be able do asynchronous IO (select/poll) in order to
receive other system events or timeouts during HSI bulk transfers.

Regards,
Sjur
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/