4d6cd48380
This patch (as755b) fixes a bug in usbmon. Rather than assuming all USB host controllers use DMA, the code will check the usb_bus data structure. If DMA isn't used, we don't want to try peeking into a non-existent DMA buffer! Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
60 lines
1.5 KiB
C
60 lines
1.5 KiB
C
/*
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* The USB Monitor, inspired by Dave Harding's USBMon.
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*
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* Copyright (C) 2005 Pete Zaitcev (zaitcev@redhat.com)
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*/
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#ifndef __USB_MON_H
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#define __USB_MON_H
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/kref.h>
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/* #include <linux/usb.h> */ /* We use struct pointers only in this header */
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#define TAG "usbmon"
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struct mon_bus {
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struct list_head bus_link;
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spinlock_t lock;
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struct dentry *dent_s; /* Debugging file */
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struct dentry *dent_t; /* Text interface file */
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struct usb_bus *u_bus;
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int uses_dma;
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/* Ref */
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int nreaders; /* Under mon_lock AND mbus->lock */
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struct list_head r_list; /* Chain of readers (usually one) */
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struct kref ref; /* Under mon_lock */
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/* Stats */
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unsigned int cnt_events;
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unsigned int cnt_text_lost;
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};
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/*
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* An instance of a process which opened a file (but can fork later)
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*/
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struct mon_reader {
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struct list_head r_link;
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struct mon_bus *m_bus;
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void *r_data; /* Use container_of instead? */
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void (*rnf_submit)(void *data, struct urb *urb);
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void (*rnf_error)(void *data, struct urb *urb, int error);
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void (*rnf_complete)(void *data, struct urb *urb);
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};
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void mon_reader_add(struct mon_bus *mbus, struct mon_reader *r);
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void mon_reader_del(struct mon_bus *mbus, struct mon_reader *r);
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/*
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*/
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extern char mon_dmapeek(unsigned char *dst, dma_addr_t dma_addr, int len);
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extern struct mutex mon_lock;
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extern const struct file_operations mon_fops_text;
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extern const struct file_operations mon_fops_stat;
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#endif /* __USB_MON_H */
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