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authorAlan Stern <stern@rowland.harvard.edu>2008-03-03 15:16:04 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-25 00:16:33 -0400
commiteb764c4be1e5db3ee34df5745e98cf2f148c7320 (patch)
treef434cf49540ab6ea2c7fae6490a693916c2e5501 /Documentation
parentfeccc30d90155bcbc937f87643182a43d25873eb (diff)
USB: check serial-number string after device reset
This patch (as1048) extends the descriptor checking after a device is reset. Now the SerialNumber string descriptor is compared to its old value, in addition to the device and configuration descriptors. As a consequence, the kmalloc() call in usb_string() is now on the error-handling pathway for usb-storage. Hence its allocation type is changed to GFO_NOIO. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/usb/persist.txt8
1 files changed, 4 insertions, 4 deletions
diff --git a/Documentation/usb/persist.txt b/Documentation/usb/persist.txt
index bea58dbd30fe..d56cb1a11550 100644
--- a/Documentation/usb/persist.txt
+++ b/Documentation/usb/persist.txt
@@ -136,10 +136,10 @@ aren't guaranteed to be 100% accurate.
136 136
137If you replace one USB device with another of the same type (same 137If you replace one USB device with another of the same type (same
138manufacturer, same IDs, and so on) there's an excellent chance the 138manufacturer, same IDs, and so on) there's an excellent chance the
139kernel won't detect the change. Serial numbers and other strings are 139kernel won't detect the change. The serial number string and other
140not compared. In many cases it wouldn't help if they were, because 140descriptors are compared with the kernel's stored values, but this
141manufacturers frequently omit serial numbers entirely in their 141might not help since manufacturers frequently omit serial numbers
142devices. 142entirely in their devices.
143 143
144Furthermore it's quite possible to leave a USB device exactly the same 144Furthermore it's quite possible to leave a USB device exactly the same
145while changing its media. If you replace the flash memory card in a 145while changing its media. If you replace the flash memory card in a