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| author | FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> | 2010-05-26 14:44:21 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:53 -0700 |
| commit | 7cdcc8e4762f0e4a94cead6a3b57b5eaa01bd5da (patch) | |
| tree | fb15134a3e3327f667f07d4dcc6bafe163fb2082 /Documentation/DMA-API-HOWTO.txt | |
| parent | 99d1bd2c131b2da10cf451c69e5b8c51761a901b (diff) | |
| download | lwn-7cdcc8e4762f0e4a94cead6a3b57b5eaa01bd5da.tar.gz lwn-7cdcc8e4762f0e4a94cead6a3b57b5eaa01bd5da.zip | |
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 <fujita.tomonori@lab.ntt.co.jp>
Cc: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation/DMA-API-HOWTO.txt')
| -rw-r--r-- | 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 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 |