Commit db0c2d59 authored by Peter Oberparleiter's avatar Peter Oberparleiter Committed by Martin Schwidefsky
Browse files

[S390] set modalias for ccw bus uevents. 



Add the MODALIAS environment variable for ccw bus uevents.

Signed-off-by: default avatarPeter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 250b2dc8

drivers/s390/cio/device.c

+66 −43
Original line number Diff line number Diff line
@@ -52,53 +52,81 @@ ccw_bus_match (struct device * dev, struct device_driver * drv) 
	return 1;

}



/*

 * Hotplugging interface for ccw devices.

 * Heavily modeled on pci and usb hotplug.

 */

static int

ccw_uevent (struct device *dev, char **envp, int num_envp,

/* Store modalias string delimited by prefix/suffix string into buffer with

 * specified size. Return length of resulting string (excluding trailing '\0')

 * even if string doesn't fit buffer (snprintf semantics). */

static int snprint_alias(char *buf, size_t size, const char *prefix,

			 struct ccw_device_id *id, const char *suffix)

{

	int len;



	len = snprintf(buf, size, "%sccw:t%04Xm%02X", prefix, id->cu_type,

		       id->cu_model);

	if (len > size)

		return len;

	buf += len;

	size -= len;



	if (id->dev_type != 0)

		len += snprintf(buf, size, "dt%04Xdm%02X%s", id->dev_type,

				id->dev_model, suffix);

	else

		len += snprintf(buf, size, "dtdm%s", suffix);



	return len;

}



/* Set up environment variables for ccw device uevent. Return 0 on success,

 * non-zero otherwise. */

static int ccw_uevent(struct device *dev, char **envp, int num_envp,

		      char *buffer, int buffer_size)

{

	struct ccw_device *cdev = to_ccwdev(dev);

	struct ccw_device_id *id = &(cdev->id);

	int i = 0;

	int length = 0;



	if (!cdev)

		return -ENODEV;



	/* what we want to pass to /sbin/hotplug */

	int len;



	envp[i++] = buffer;

	length += scnprintf(buffer, buffer_size - length, "CU_TYPE=%04X",

			   cdev->id.cu_type);

	if ((buffer_size - length <= 0) || (i >= num_envp))

	/* CU_TYPE= */

	len = snprintf(buffer, buffer_size, "CU_TYPE=%04X", id->cu_type) + 1;

	if (len > buffer_size || i >= num_envp)

		return -ENOMEM;

	++length;

	buffer += length;



	envp[i++] = buffer;

	length += scnprintf(buffer, buffer_size - length, "CU_MODEL=%02X",

			   cdev->id.cu_model);

	if ((buffer_size - length <= 0) || (i >= num_envp))

	buffer += len;

	buffer_size -= len;



	/* CU_MODEL= */

	len = snprintf(buffer, buffer_size, "CU_MODEL=%02X", id->cu_model) + 1;

	if (len > buffer_size || i >= num_envp)

		return -ENOMEM;

	++length;

	buffer += length;

	envp[i++] = buffer;

	buffer += len;

	buffer_size -= len;



	/* The next two can be zero, that's ok for us */

	envp[i++] = buffer;

	length += scnprintf(buffer, buffer_size - length, "DEV_TYPE=%04X",

			   cdev->id.dev_type);

	if ((buffer_size - length <= 0) || (i >= num_envp))

	/* DEV_TYPE= */

	len = snprintf(buffer, buffer_size, "DEV_TYPE=%04X", id->dev_type) + 1;

	if (len > buffer_size || i >= num_envp)

		return -ENOMEM;

	++length;

	buffer += length;

	envp[i++] = buffer;

	buffer += len;

	buffer_size -= len;



	/* DEV_MODEL= */

	len = snprintf(buffer, buffer_size, "DEV_MODEL=%02X",

			(unsigned char) id->dev_model) + 1;

	if (len > buffer_size || i >= num_envp)

		return -ENOMEM;

	envp[i++] = buffer;

	length += scnprintf(buffer, buffer_size - length, "DEV_MODEL=%02X",

			   cdev->id.dev_model);

	if ((buffer_size - length <= 0) || (i >= num_envp))

	buffer += len;

	buffer_size -= len;



	/* MODALIAS=  */

	len = snprint_alias(buffer, buffer_size, "MODALIAS=", id, "") + 1;

	if (len > buffer_size || i >= num_envp)

		return -ENOMEM;

	envp[i++] = buffer;

	buffer += len;

	buffer_size -= len;



	envp[i] = NULL;
@@ -251,16 +279,11 @@ modalias_show (struct device *dev, struct device_attribute *attr, char *buf) 
{

	struct ccw_device *cdev = to_ccwdev(dev);

	struct ccw_device_id *id = &(cdev->id);

	int ret;

	int len;



	ret = sprintf(buf, "ccw:t%04Xm%02X",

			id->cu_type, id->cu_model);

	if (id->dev_type != 0)

		ret += sprintf(buf + ret, "dt%04Xdm%02X\n",

				id->dev_type, id->dev_model);

	else

		ret += sprintf(buf + ret, "dtdm\n");

	return ret;

	len = snprint_alias(buf, PAGE_SIZE, "", id, "\n") + 1;



	return len > PAGE_SIZE ? PAGE_SIZE : len;

}



static ssize_t