From 3e2c159260eed10c44f0dd028c328a40a27ad235 Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Wed, 24 Oct 2012 13:26:15 +0200 Subject: [PATCH] iwlwifi: clarify NOCOPY/DUP documentation Clarify the documentation to indicate that these flags can only be used at the end, i.e. after them a copy TFD (no flags set) is invalid. Reported-by: Inbal Hacohen Reviewed-by: Emmanuel Grumbach Signed-off-by: Johannes Berg --- drivers/net/wireless/iwlwifi/iwl-trans.h | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h index 76c52378f8f7..47bbe399c068 100644 --- a/drivers/net/wireless/iwlwifi/iwl-trans.h +++ b/drivers/net/wireless/iwlwifi/iwl-trans.h @@ -225,10 +225,13 @@ struct iwl_device_cmd { * ring. The transport layer doesn't map the command's buffer to DMA, but * rather copies it to an previously allocated DMA buffer. This flag tells * the transport layer not to copy the command, but to map the existing - * buffer. This can save memcpy and is worth with very big comamnds. + * buffer (that is passed in) instead. This saves the memcpy and allows + * commands that are bigger than the fixed buffer to be submitted. + * Note that a TFD entry after a NOCOPY one cannot be a normal copied one. * @IWL_HCMD_DFL_DUP: Only valid without NOCOPY, duplicate the memory for this * chunk internally and free it again after the command completes. This * can (currently) be used only once per command. + * Note that a TFD entry after a DUP one cannot be a normal copied one. */ enum iwl_hcmd_dataflag { IWL_HCMD_DFL_NOCOPY = BIT(0), -- 2.11.0