linux-kernel - [PATCH 01/03] uio: Add enable

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Message-Id: <20080520105140.1474.59715.sendpatchset@rx1.opensource.se>
Date:	Tue, 20 May 2008 19:51:40 +0900
From:	Magnus Damm <magnus.damm@...il.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-sh@...r.kernel.org, Magnus Damm <magnus.damm@...il.com>,
	lethal@...ux-sh.org, hjk@...utronix.de, gregkh@...e.de
Subject: [PATCH 01/03] uio: Add enable_irq() callback

Add enable_irq() callback to struct uio_info. This callback is needed by
the uio_platform driver so interrupts can be enabled before blocking.

Signed-off-by: Magnus Damm <damm@...l.co.jp>
---

 drivers/uio/uio.c          |    6 ++++++
 include/linux/uio_driver.h |    1 +
 2 files changed, 7 insertions(+)

--- 0001/drivers/uio/uio.c
+++ work/drivers/uio/uio.c	2008-05-19 14:52:08.000000000 +0900
@@ -365,6 +365,9 @@ static unsigned int uio_poll(struct file
 	if (idev->info->irq == UIO_IRQ_NONE)
 		return -EIO;
 
+	if (idev->info->enable_irq)
+		idev->info->enable_irq(idev->info);
+
 	poll_wait(filep, &idev->wait, wait);
 	if (listener->event_count != atomic_read(&idev->event))
 		return POLLIN | POLLRDNORM;
@@ -391,6 +394,9 @@ static ssize_t uio_read(struct file *fil
 	do {
 		set_current_state(TASK_INTERRUPTIBLE);
 
+		if (idev->info->enable_irq)
+			idev->info->enable_irq(idev->info);
+
 		event_count = atomic_read(&idev->event);
 		if (event_count != listener->event_count) {
 			if (copy_to_user(buf, &event_count, count))
--- 0001/include/linux/uio_driver.h
+++ work/include/linux/uio_driver.h	2008-05-19 14:52:08.000000000 +0900
@@ -64,6 +64,7 @@ struct uio_info {
 	void			*priv;
 	irqreturn_t (*handler)(int irq, struct uio_info *dev_info);
 	int (*mmap)(struct uio_info *info, struct vm_area_struct *vma);
+	void (*enable_irq)(struct uio_info *info);
 	int (*open)(struct uio_info *info, struct inode *inode);
 	int (*release)(struct uio_info *info, struct inode *inode);
 };
--
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