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[PATCH] USB: update usbmon, fix glued lines 

This update contains one bug fix: some lines can come out truncated,
because of the safety cutoff. This happened because I forgot to update
the size when status packets began to be printed.

The rest is:
 - Comments updates
 - Allow snooping with pkmap on x86_64, which is cache-coherent
 - Enlarge event buffers (certainly we can have a couple of pages)
 - Add event counter

First touch upon usbmon for 2.6.18.

Signed-off-by: Pete Zaitcev <zaitcev@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Pete Zaitcev 2006-06-09 20:10:10 -07:00 committed by Greg Kroah-Hartman
parent 4bc203d997
commit 5b1c674d22
5 changed files with 15 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
drivers/usb/mon/mon_dma.c
View File

@ -13,7 +13,10 @@
#include <linux/usb.h> /* Only needed for declarations in usb_mon.h */
#include "usb_mon.h"
#ifdef __i386__ /* CONFIG_ARCH_I386 does not exit */
/*
* PC-compatibles, are, fortunately, sufficiently cache-coherent for this.
*/
#if defined(__i386__) || defined(__x86_64__) /* CONFIG_ARCH_I386 doesn't exit */
#define MON_HAS_UNMAP 1
#define phys_to_page(phys) pfn_to_page((phys) >> PAGE_SHIFT)

3
drivers/usb/mon/mon_main.c
View File

@ -97,6 +97,7 @@ static void mon_submit(struct usb_bus *ubus, struct urb *urb)
if (mbus->nreaders == 0)
goto out_locked;
mbus->cnt_events++;
list_for_each (pos, &mbus->r_list) {
r = list_entry(pos, struct mon_reader, r_link);
r->rnf_submit(r->r_data, urb);
@ -152,6 +153,7 @@ static void mon_complete(struct usb_bus *ubus, struct urb *urb)
}
spin_lock_irqsave(&mbus->lock, flags);
mbus->cnt_events++;
list_for_each (pos, &mbus->r_list) {
r = list_entry(pos, struct mon_reader, r_link);
r->rnf_complete(r->r_data, urb);
@ -163,7 +165,6 @@ static void mon_complete(struct usb_bus *ubus, struct urb *urb)
/*
* Stop monitoring.
* Obviously this must be well locked, so no need to play with mb's.
*/
static void mon_stop(struct mon_bus *mbus)
{

4
drivers/usb/mon/mon_stat.c
View File

@ -31,8 +31,8 @@ static int mon_stat_open(struct inode *inode, struct file *file)
mbus = inode->u.generic_ip;
sp->slen = snprintf(sp->str, STAT_BUF_SIZE,
"nreaders %d text_lost %u\n",
mbus->nreaders, mbus->cnt_text_lost);
"nreaders %d events %u text_lost %u\n",
mbus->nreaders, mbus->cnt_events, mbus->cnt_text_lost);
file->private_data = sp;
return 0;

9
drivers/usb/mon/mon_text.c
View File

@ -26,10 +26,13 @@
/*
* This limit exists to prevent OOMs when the user process stops reading.
* If usbmon were available to unprivileged processes, it might be open
* to a local DoS. But we have to keep to root in order to prevent
* password sniffing from HID devices.
*/
#define EVENT_MAX 25
#define EVENT_MAX (2*PAGE_SIZE / sizeof(struct mon_event_text))
#define PRINTF_DFL 130
#define PRINTF_DFL 160
struct mon_event_text {
struct list_head e_link;
@ -111,7 +114,7 @@ static inline char mon_text_get_data(struct mon_event_text *ep, struct urb *urb,
* number of corner cases, but it seems that the following is
* more or less safe.
*
* We do not even try to look transfer_buffer, because it can
* We do not even try to look at transfer_buffer, because it can
* contain non-NULL garbage in case the upper level promised to
* set DMA for the HCD.
*/

1
drivers/usb/mon/usb_mon.h
View File

@ -27,6 +27,7 @@ struct mon_bus {
struct kref ref; /* Under mon_lock */
/* Stats */
unsigned int cnt_events;
unsigned int cnt_text_lost;
};