Commit 7cdcc8e4 authored by FUJITA Tomonori's avatar FUJITA Tomonori Committed by Linus Torvalds

Documentation: add SCSI drivers' mapping error handling to DMA-API-HOWTO

Add the concrete DMA mapping error handling for SCSI drivers on the
queuecommand path.
Signed-off-by: default avatarFUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 99d1bd2c
......@@ -745,6 +745,10 @@ and return NETDEV_TX_OK if the DMA mapping fails on the transmit hook
(ndo_start_xmit). This means that the socket buffer is just dropped in
the failure case.
SCSI drivers must return SCSI_MLQUEUE_HOST_BUSY if the DMA mapping
fails in the queuecommand hook. This means that the SCSI subsystem
passes the command to the driver again later.
Closing
This document, and the API itself, would not be in its current
......
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