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@@ -745,6 +745,10 @@ and return NETDEV_TX_OK if the DMA mapping fails on the transmit hook
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(ndo_start_xmit). This means that the socket buffer is just dropped in
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the failure case.
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+SCSI drivers must return SCSI_MLQUEUE_HOST_BUSY if the DMA mapping
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+fails in the queuecommand hook. This means that the SCSI subsystem
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+passes the command to the driver again later.
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+
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Closing
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This document, and the API itself, would not be in its current
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