1 files changed, 25 insertions, 19 deletions

diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index b0f8ed5a7fb9..9534ff3f5e7b 100644
--- a/drivers/usb/host/ehci-dbg.c
+++ b/drivers/usb/host/ehci-dbg.c
@@ -358,7 +358,8 @@ struct debug_buffer {
         struct usb_bus *bus;
         struct mutex mutex;     /* protect filling of buffer */
         size_t count;           /* number of characters filled into buffer */
-        char *page;
+        char *output_buf;
+        size_t alloc_size;
 };
 
 #define speed_char(info1) ({ char tmp; \
@@ -488,8 +489,8 @@ static ssize_t fill_async_buffer(struct debug_buffer *buf)
 
         hcd = bus_to_hcd(buf->bus);
         ehci = hcd_to_ehci (hcd);
-        next = buf->page;
-        size = PAGE_SIZE;
+        next = buf->output_buf;
+        size = buf->alloc_size;
 
         *next = 0;
 
@@ -510,7 +511,7 @@ static ssize_t fill_async_buffer(struct debug_buffer *buf)
         }
         spin_unlock_irqrestore (&ehci->lock, flags);
 
-        return strlen(buf->page);
+        return strlen(buf->output_buf);
 }
 
 #define DBG_SCHED_LIMIT 64
@@ -531,8 +532,8 @@ static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 
         hcd = bus_to_hcd(buf->bus);
         ehci = hcd_to_ehci (hcd);
-        next = buf->page;
-        size = PAGE_SIZE;
+        next = buf->output_buf;
+        size = buf->alloc_size;
 
         temp = scnprintf (next, size, "size = %d\n", ehci->periodic_size);
         size -= temp;
@@ -649,7 +650,7 @@ static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
         spin_unlock_irqrestore (&ehci->lock, flags);
         kfree (seen);
 
-        return PAGE_SIZE - size;
+        return buf->alloc_size - size;
 }
 #undef DBG_SCHED_LIMIT
 
@@ -665,8 +666,8 @@ static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 
         hcd = bus_to_hcd(buf->bus);
         ehci = hcd_to_ehci (hcd);
-        next = buf->page;
-        size = PAGE_SIZE;
+        next = buf->output_buf;
+        size = buf->alloc_size;
 
         spin_lock_irqsave (&ehci->lock, flags);
 
@@ -808,7 +809,7 @@ static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 done:
         spin_unlock_irqrestore (&ehci->lock, flags);
 
-        return PAGE_SIZE - size;
+        return buf->alloc_size - size;
 }
 
 static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
@@ -822,6 +823,7 @@ static struct debug_buffer *alloc_buffer(struct usb_bus *bus,
                 buf->bus = bus;
                 buf->fill_func = fill_func;
                 mutex_init(&buf->mutex);
+                buf->alloc_size = PAGE_SIZE;
         }
 
         return buf;
@@ -831,10 +833,10 @@ static int fill_buffer(struct debug_buffer *buf)
 {
         int ret = 0;
 
-        if (!buf->page)
-                buf->page = (char *)get_zeroed_page(GFP_KERNEL);
+        if (!buf->output_buf)
+                buf->output_buf = (char *)vmalloc(buf->alloc_size);
 
-        if (!buf->page) {
+        if (!buf->output_buf) {
                 ret = -ENOMEM;
                 goto out;
         }
@@ -867,7 +869,7 @@ static ssize_t debug_output(struct file *file, char __user *user_buf,
         mutex_unlock(&buf->mutex);
 
         ret = simple_read_from_buffer(user_buf, len, offset,
-                                      buf->page, buf->count);
+                                      buf->output_buf, buf->count);
 
 out:
         return ret;
@@ -879,8 +881,8 @@ static int debug_close(struct inode *inode, struct file *file)
         struct debug_buffer *buf = file->private_data;
 
         if (buf) {
-                if (buf->page)
-                        free_page((unsigned long)buf->page);
+                if (buf->output_buf)
+                        vfree(buf->output_buf);
                 kfree(buf);
         }
 
@@ -895,10 +897,14 @@ static int debug_async_open(struct inode *inode, struct file *file)
 
 static int debug_periodic_open(struct inode *inode, struct file *file)
 {
-        file->private_data = alloc_buffer(inode->i_private,
-                                          fill_periodic_buffer);
+        struct debug_buffer *buf;
+        buf = alloc_buffer(inode->i_private, fill_periodic_buffer);
+        if (!buf)
+                return -ENOMEM;
 
-        return file->private_data ? 0 : -ENOMEM;
+        buf->alloc_size = (sizeof(void *) == 4 ? 6 : 8)*PAGE_SIZE;
+        file->private_data = buf;
+        return 0;
 }
 
 static int debug_registers_open(struct inode *inode, struct file *file)