From: FUJITA Tomonori Date: Wed, 26 May 2010 21:44:21 +0000 (-0700) Subject: Documentation: add SCSI drivers' mapping error handling to DMA-API-HOWTO X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=7cdcc8e4762f0e4a94cead6a3b57b5eaa01bd5da;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git 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 --- diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt index 93d90870791c..a38ddadd208e 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