[PATCH] PCI Hotplug: fix up the sysfs file in the compaq pci hotplug driver
The Compaq PCI Hotplug driver was creating 2 sysfs files that contained
nothing but debug information, and had way more than "one value" in
them. This patch converts the code to use debugfs for these files
instead.
Compile tested only.
Cc: Kay Sievers <kay.sievers@vrfy.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/pci/hotplug/cpqphp_sysfs.c b/drivers/pci/hotplug/cpqphp_sysfs.c
index 4c11048..bbfeed7 100644
--- a/drivers/pci/hotplug/cpqphp_sysfs.c
+++ b/drivers/pci/hotplug/cpqphp_sysfs.c
@@ -33,22 +33,15 @@
#include <linux/proc_fs.h>
#include <linux/workqueue.h>
#include <linux/pci.h>
+#include <linux/debugfs.h>
#include "cpqphp.h"
-
-/* A few routines that create sysfs entries for the hot plug controller */
-
-static ssize_t show_ctrl (struct device *dev, struct device_attribute *attr, char *buf)
+static int show_ctrl (struct controller *ctrl, char *buf)
{
- struct pci_dev *pci_dev;
- struct controller *ctrl;
- char * out = buf;
+ char *out = buf;
int index;
struct pci_resource *res;
- pci_dev = container_of (dev, struct pci_dev, dev);
- ctrl = pci_get_drvdata(pci_dev);
-
out += sprintf(buf, "Free resources: memory\n");
index = 11;
res = ctrl->mem_head;
@@ -80,22 +73,16 @@
return out - buf;
}
-static DEVICE_ATTR (ctrl, S_IRUGO, show_ctrl, NULL);
-static ssize_t show_dev (struct device *dev, struct device_attribute *attr, char *buf)
+static int show_dev (struct controller *ctrl, char *buf)
{
- struct pci_dev *pci_dev;
- struct controller *ctrl;
char * out = buf;
int index;
struct pci_resource *res;
struct pci_func *new_slot;
struct slot *slot;
- pci_dev = container_of (dev, struct pci_dev, dev);
- ctrl = pci_get_drvdata(pci_dev);
-
- slot=ctrl->slot;
+ slot = ctrl->slot;
while (slot) {
new_slot = cpqhp_slot_find(slot->bus, slot->device, 0);
@@ -134,10 +121,117 @@
return out - buf;
}
-static DEVICE_ATTR (dev, S_IRUGO, show_dev, NULL);
-void cpqhp_create_ctrl_files (struct controller *ctrl)
+static int spew_debug_info(struct controller *ctrl, char *data, int size)
{
- device_create_file (&ctrl->pci_dev->dev, &dev_attr_ctrl);
- device_create_file (&ctrl->pci_dev->dev, &dev_attr_dev);
+ int used;
+
+ used = size - show_ctrl(ctrl, data);
+ used = (size - used) - show_dev(ctrl, &data[used]);
+ return used;
}
+
+struct ctrl_dbg {
+ int size;
+ char *data;
+ struct controller *ctrl;
+};
+
+#define MAX_OUTPUT (4*PAGE_SIZE)
+
+static int open(struct inode *inode, struct file *file)
+{
+ struct controller *ctrl = inode->u.generic_ip;
+ struct ctrl_dbg *dbg;
+ int retval = -ENOMEM;
+
+ lock_kernel();
+ dbg = kmalloc(sizeof(*dbg), GFP_KERNEL);
+ if (!dbg)
+ goto exit;
+ dbg->data = kmalloc(MAX_OUTPUT, GFP_KERNEL);
+ if (!dbg->data) {
+ kfree(dbg);
+ goto exit;
+ }
+ dbg->size = spew_debug_info(ctrl, dbg->data, MAX_OUTPUT);
+ file->private_data = dbg;
+ retval = 0;
+exit:
+ unlock_kernel();
+ return retval;
+}
+
+static loff_t lseek(struct file *file, loff_t off, int whence)
+{
+ struct ctrl_dbg *dbg;
+ loff_t new = -1;
+
+ lock_kernel();
+ dbg = file->private_data;
+
+ switch (whence) {
+ case 0:
+ new = off;
+ break;
+ case 1:
+ new = file->f_pos + off;
+ break;
+ }
+ if (new < 0 || new > dbg->size) {
+ unlock_kernel();
+ return -EINVAL;
+ }
+ unlock_kernel();
+ return (file->f_pos = new);
+}
+
+static ssize_t read(struct file *file, char __user *buf,
+ size_t nbytes, loff_t *ppos)
+{
+ struct ctrl_dbg *dbg = file->private_data;
+ return simple_read_from_buffer(buf, nbytes, ppos, dbg->data, dbg->size);
+}
+
+static int release(struct inode *inode, struct file *file)
+{
+ struct ctrl_dbg *dbg = file->private_data;
+
+ kfree(dbg->data);
+ kfree(dbg);
+ return 0;
+}
+
+static struct file_operations debug_ops = {
+ .owner = THIS_MODULE,
+ .open = open,
+ .llseek = lseek,
+ .read = read,
+ .release = release,
+};
+
+static struct dentry *root;
+
+void cpqhp_initialize_debugfs(void)
+{
+ if (!root)
+ root = debugfs_create_dir("cpqhp", NULL);
+}
+
+void cpqhp_shutdown_debugfs(void)
+{
+ debugfs_remove(root);
+}
+
+void cpqhp_create_debugfs_files(struct controller *ctrl)
+{
+ ctrl->dentry = debugfs_create_file(ctrl->pci_dev->dev.bus_id, S_IRUGO, root, ctrl, &debug_ops);
+}
+
+void cpqhp_remove_debugfs_files(struct controller *ctrl)
+{
+ if (ctrl->dentry)
+ debugfs_remove(ctrl->dentry);
+ ctrl->dentry = NULL;
+}
+