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path: root/drivers/usb/host/ehci-dbg.c
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Diffstat (limited to 'drivers/usb/host/ehci-dbg.c')
-rw-r--r--drivers/usb/host/ehci-dbg.c56
1 files changed, 32 insertions, 24 deletions
diff --git a/drivers/usb/host/ehci-dbg.c b/drivers/usb/host/ehci-dbg.c
index b0f8ed5a7fb9..0cb53ca8d343 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;
@@ -568,14 +569,16 @@ static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
for (temp = 0; temp < seen_count; temp++) {
if (seen [temp].ptr != p.ptr)
continue;
- if (p.qh->qh_next.ptr)
+ if (p.qh->qh_next.ptr) {
temp = scnprintf (next, size,
" ...");
- p.ptr = NULL;
+ size -= temp;
+ next += temp;
+ }
break;
}
/* show more info the first time around */
- if (temp == seen_count && p.ptr) {
+ if (temp == seen_count) {
u32 scratch = hc32_to_cpup(ehci,
&p.qh->hw_info1);
struct ehci_qtd *qtd;
@@ -649,7 +652,7 @@ 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
@@ -665,14 +668,14 @@ 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);
if (!test_bit(HCD_FLAG_HW_ACCESSIBLE, &hcd->flags)) {
size = scnprintf (next, size,
- "bus %s, device %s (driver " DRIVER_VERSION ")\n"
+ "bus %s, device %s\n"
"%s\n"
"SUSPENDED (no register access)\n",
hcd->self.controller->bus->name,
@@ -684,7 +687,7 @@ static ssize_t fill_registers_buffer(struct debug_buffer *buf)
/* Capability Registers */
i = HC_VERSION(ehci_readl(ehci, &ehci->caps->hc_capbase));
temp = scnprintf (next, size,
- "bus %s, device %s (driver " DRIVER_VERSION ")\n"
+ "bus %s, device %s\n"
"%s\n"
"EHCI %x.%02x, hcd state %d\n",
hcd->self.controller->bus->name,
@@ -808,7 +811,7 @@ 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 +825,7 @@ 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 +835,10 @@ 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 +871,7 @@ 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 +883,8 @@ 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 +899,14 @@ 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)