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Date: Tue, 11 May 2010 11:55:27 +0900 From: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> To: akpm@...ux-foundation.org Cc: linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp, James Bottomley <James.Bottomley@...e.de> Subject: [PATCH -mm 1/3] Documentation: add SCSI drivers' mapping error handling to DMA-API-HOWTO Adds the concrete DMA mapping error handling for SCSI drivers on the queuecommand path. Signed-off-by: FUJITA Tomonori <fujita.tomonori@....ntt.co.jp> Cc: James Bottomley <James.Bottomley@...e.de> --- Documentation/DMA-API-HOWTO.txt | 4 ++++ 1 files changed, 4 insertions(+), 0 deletions(-) diff --git a/Documentation/DMA-API-HOWTO.txt b/Documentation/DMA-API-HOWTO.txt index 93d9087..a38ddad 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 -- 1.6.5 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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