From 59c629571568043fbdf1b8377a6b1b3561e1fd29 Mon Sep 17 00:00:00 2001 From: FUJITA Tomonori Date: Wed, 26 May 2010 14:44:21 -0700 Subject: [PATCH] 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: FUJITA Tomonori Cc: James Bottomley Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- Documentation/DMA-API-HOWTO.txt | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt index 93d90870791ce..a38ddadd208e3 100644 --- a/Documentation/DMA-API-HOWTO.txt +++ b/Documentation/DMA-API-HOWTO.txt @@ -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 -- 2.39.5