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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 <inbal.hacohen@intel.com>
Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Johannes Berg 2012-10-24 13:26:15 +02:00
parent f4feb8ac6e
commit 3e2c159260
1 changed files with 4 additions and 1 deletions
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5
drivers/net/wireless/iwlwifi/iwl-trans.h
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@ -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),