From 87c1c28a9aa149489e1667f5754fc24f4973d2d0 Mon Sep 17 00:00:00 2001 From: Ilan Peer Date: Sun, 25 Aug 2024 08:56:37 +0300 Subject: wifi: iwlwifi: mvm: Fix a race in scan abort flow When the upper layer requests to cancel an ongoing scan, a race is possible in which by the time the driver starts to handle the upper layers scan cancel flow, the FW already completed handling the scan request and the driver received the scan complete notification but still did not handle the notification. In such a case the FW will simply ignore the scan abort request coming from the driver, no notification would arrive from the FW and the entire abort flow would be considered a failure. To better handle this, check the status code returned by the FW for the scan abort command. In case the status indicates that no scan was aborted, complete the scan abort flow with success, i.e., the scan was aborted, as the flow is expected to consume the scan complete notification. Signed-off-by: Ilan Peer Signed-off-by: Miri Korenblit Link: https://patch.msgid.link/20240825085558.483989d3baef.I3340556a222388504c6330b333360bf77d10f9e2@changeid Signed-off-by: Johannes Berg --- drivers/net/wireless/intel/iwlwifi/fw/api/scan.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) (limited to 'drivers/net/wireless/intel/iwlwifi/fw/api/scan.h') diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/scan.h b/drivers/net/wireless/intel/iwlwifi/fw/api/scan.h index 8598031567bb..0aefdf353b21 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/api/scan.h +++ b/drivers/net/wireless/intel/iwlwifi/fw/api/scan.h @@ -1132,6 +1132,19 @@ struct iwl_umac_scan_abort { __le32 flags; } __packed; /* SCAN_ABORT_CMD_UMAC_API_S_VER_1 */ +/** + * enum iwl_umac_scan_abort_status + * + * @IWL_UMAC_SCAN_ABORT_STATUS_SUCCESS: scan was successfully aborted + * @IWL_UMAC_SCAN_ABORT_STATUS_IN_PROGRESS: scan abort is in progress + * @IWL_UMAC_SCAN_ABORT_STATUS_NOT_FOUND: nothing to abort + */ +enum iwl_umac_scan_abort_status { + IWL_UMAC_SCAN_ABORT_STATUS_SUCCESS = 0, + IWL_UMAC_SCAN_ABORT_STATUS_IN_PROGRESS, + IWL_UMAC_SCAN_ABORT_STATUS_NOT_FOUND, +}; + /** * struct iwl_umac_scan_complete * @uid: scan id, &enum iwl_umac_scan_uid_offsets -- cgit From 1a7d2870f472db94d2dada643651f1e604c67bcf Mon Sep 17 00:00:00 2001 From: Johannes Berg Date: Sun, 1 Sep 2024 07:17:50 +0300 Subject: wifi: iwlwifi: mvm: refactor scan channel description a bit The channel number is at the same position across all versions of the channel description struct, so move it out of the union that versions it. Also add __packed annotations to all of the sub-structs and the union so it's packed correctly, and fully document the structure. Signed-off-by: Johannes Berg Reviewed-by: Ilan Peer Reviewed-by: Daniel Gabay Signed-off-by: Miri Korenblit Link: https://patch.msgid.link/20240901071542.e31623ae4201.I1ea69a8ec3d39492f39d84e31fb105b159359c28@changeid Signed-off-by: Johannes Berg --- drivers/net/wireless/intel/iwlwifi/fw/api/scan.h | 33 ++++++++++++++---------- 1 file changed, 20 insertions(+), 13 deletions(-) (limited to 'drivers/net/wireless/intel/iwlwifi/fw/api/scan.h') diff --git a/drivers/net/wireless/intel/iwlwifi/fw/api/scan.h b/drivers/net/wireless/intel/iwlwifi/fw/api/scan.h index 0aefdf353b21..f486d624500b 100644 --- a/drivers/net/wireless/intel/iwlwifi/fw/api/scan.h +++ b/drivers/net/wireless/intel/iwlwifi/fw/api/scan.h @@ -731,39 +731,46 @@ enum iwl_umac_scan_general_params_flags2 { * struct iwl_scan_channel_cfg_umac * @flags: bitmap - 0-19: directed scan to i'th ssid. * @channel_num: channel number 1-13 etc. - * @band: band of channel: 0 for 2GHz, 1 for 5GHz - * @iter_count: repetition count for the channel. - * @iter_interval: interval between two scan iterations on one channel. + * @v1: command version 1 + * @v1.iter_count: repetition count for the channel. + * @v1.iter_interval: interval between two scan iterations on one channel. + * @v2: command versions 2-4 + * @v2.band: band of channel: 0 for 2GHz, 1 for 5GHz + * @v2.iter_count: repetition count for the channel. + * @v2.iter_interval: interval between two scan iterations on one channel. + * @v5: command versions 5 and up + * @v5.iter_count: repetition count for the channel. + * @v5.iter_interval: interval between two scan iterations on one channel. + * @v5.psd_20: highest PSD value for all APs known so far + * on this channel. */ struct iwl_scan_channel_cfg_umac { #define IWL_CHAN_CFG_FLAGS_BAND_POS 30 __le32 flags; + u8 channel_num; /* All versions are of the same size, so use a union without adjusting * the command size later */ union { struct { - u8 channel_num; u8 iter_count; __le16 iter_interval; - } v1; /* SCAN_CHANNEL_CONFIG_API_S_VER_1 */ + } __packed v1; /* SCAN_CHANNEL_CONFIG_API_S_VER_1 */ struct { - u8 channel_num; u8 band; u8 iter_count; u8 iter_interval; - } v2; /* SCAN_CHANNEL_CONFIG_API_S_VER_2 - * SCAN_CHANNEL_CONFIG_API_S_VER_3 - * SCAN_CHANNEL_CONFIG_API_S_VER_4 - */ + } __packed v2; /* SCAN_CHANNEL_CONFIG_API_S_VER_2 + * SCAN_CHANNEL_CONFIG_API_S_VER_3 + * SCAN_CHANNEL_CONFIG_API_S_VER_4 + */ struct { - u8 channel_num; u8 psd_20; u8 iter_count; u8 iter_interval; - } v5; /* SCAN_CHANNEL_CONFIG_API_S_VER_5 */ - }; + } __packed v5; /* SCAN_CHANNEL_CONFIG_API_S_VER_5 */ + } __packed; } __packed; /** -- cgit