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xenbus: Add proper handling of XS_ERROR from Xenbus for transactions.
If Xenstore sends back a XS_ERROR for TRANSACTION_END, the driver BUGs because it cannot find the matching transaction in the list. For TRANSACTION_START, it leaks memory. Check the message as returned from xenbus_dev_request_and_reply(), and clean up for TRANSACTION_START or discard the error for TRANSACTION_END. Signed-off-by: Jennifer Herbert <[email protected]> Signed-off-by: David Vrabel <[email protected]>
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