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[iscsi] Ensure ISID is consistent within an iSCSI session
Commit 5f4ab0d ("[iscsi] Randomise a portion of the ISID to force new session instantiation") introduced a regression by randomising the ISID on each call to iscsi_start_login(), which may be called more than once per connection, rather than on each call to iscsi_open_connection(), which is guaranteed to be called only once per connection. This is incorrect behaviour that causes our connection to be rejected by some iSCSI targets (observed with a COMSTAR target under OpenSolaris). Fix by generating the ISID in iscsi_open_connection(), and storing the randomised ISID as part of the session state. Signed-off-by: Michael Brown <mcb30@ipxe.org>
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