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authorAlan Stern <stern@rowland.harvard.edu>2008-03-03 15:16:04 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2008-04-24 21:16:33 -0700
commiteb764c4be1e5db3ee34df5745e98cf2f148c7320 (patch)
treef434cf49540ab6ea2c7fae6490a693916c2e5501 /Documentation/usb
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/usb')
-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 bea58dbd30f..d56cb1a1155 100644
--- a/Documentation/usb/persist.txt
+++ b/Documentation/usb/persist.txt
@@ -136,10 +136,10 @@ aren't guaranteed to be 100% accurate.
If you replace one USB device with another of the same type (same
manufacturer, same IDs, and so on) there's an excellent chance the
-kernel won't detect the change. Serial numbers and other strings are
-not compared. In many cases it wouldn't help if they were, because
-manufacturers frequently omit serial numbers entirely in their
-devices.
+kernel won't detect the change. The serial number string and other
+descriptors are compared with the kernel's stored values, but this
+might not help since manufacturers frequently omit serial numbers
+entirely in their devices.
Furthermore it's quite possible to leave a USB device exactly the same
while changing its media. If you replace the flash memory card in a