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usbmon: don't call mon_dmapeek if DMA isn't being used

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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>
This commit is contained in:
Alan Stern
2006-08-30 11:35:21 -04:00
committed by Greg Kroah-Hartman
parent 1720058343
commit 4d6cd48380
3 changed files with 9 additions and 6 deletions
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1
drivers/usb/mon/usb_mon.h
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@@ -20,6 +20,7 @@ struct mon_bus {
struct dentry *dent_s; /* Debugging file */
struct dentry *dent_t; /* Text interface file */
struct usb_bus *u_bus;
int uses_dma;
/* Ref */
int nreaders; /* Under mon_lock AND mbus->lock */