ath9k: fix spurious decryption crc error regression (backport of r24976)

git-svn-id: svn://svn.openwrt.org/openwrt/branches/backfire@24977 3c298f89-4303-0410-b956-a3cf2f4a3e73

diff --git a/package/mac80211/patches/550-ath9k_decrypt_error_fix.patch b/package/mac80211/patches/550-ath9k_decrypt_error_fix.patch
new file mode 100644 (file)
index 0000000..795018c
--- /dev/null
+++ b/package/mac80211/patches/550-ath9k_decrypt_error_fix.patch
@@ -0,0 +1,56 @@
+--- a/drivers/net/wireless/ath/ath9k/ar9003_mac.c
++++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.c
+@@ -615,7 +615,7 @@ int ath9k_hw_process_rxdesc_edma(struct 
+                */
+               if (rxsp->status11 & AR_CRCErr)
+                       rxs->rs_status |= ATH9K_RXERR_CRC;
+-              if (rxsp->status11 & AR_PHYErr) {
++              else if (rxsp->status11 & AR_PHYErr) {
+                       phyerr = MS(rxsp->status11, AR_PHYErrCode);
+                       /*
+                        * If we reach a point here where AR_PostDelimCRCErr is
+@@ -638,11 +638,11 @@ int ath9k_hw_process_rxdesc_edma(struct 
+                               rxs->rs_phyerr = phyerr;
+                       }
+ 
+-              }
+-              if (rxsp->status11 & AR_DecryptCRCErr)
++              } else if (rxsp->status11 & AR_DecryptCRCErr)
+                       rxs->rs_status |= ATH9K_RXERR_DECRYPT;
+-              if (rxsp->status11 & AR_MichaelErr)
++              else if (rxsp->status11 & AR_MichaelErr)
+                       rxs->rs_status |= ATH9K_RXERR_MIC;
++
+               if (rxsp->status11 & AR_KeyMiss)
+                       rxs->rs_status |= ATH9K_RXERR_DECRYPT;
+       }
+--- a/drivers/net/wireless/ath/ath9k/mac.c
++++ b/drivers/net/wireless/ath/ath9k/mac.c
+@@ -690,17 +690,23 @@ int ath9k_hw_rxprocdesc(struct ath_hw *a
+               rs->rs_flags |= ATH9K_RX_DECRYPT_BUSY;
+ 
+       if ((ads.ds_rxstatus8 & AR_RxFrameOK) == 0) {
++              /*
++               * Treat these errors as mutually exclusive to avoid spurious
++               * extra error reports from the hardware. If a CRC error is
++               * reported, then decryption and MIC errors are irrelevant,
++               * the frame is going to be dropped either way
++               */
+               if (ads.ds_rxstatus8 & AR_CRCErr)
+                       rs->rs_status |= ATH9K_RXERR_CRC;
+-              if (ads.ds_rxstatus8 & AR_PHYErr) {
++              else if (ads.ds_rxstatus8 & AR_PHYErr) {
+                       rs->rs_status |= ATH9K_RXERR_PHY;
+                       phyerr = MS(ads.ds_rxstatus8, AR_PHYErrCode);
+                       rs->rs_phyerr = phyerr;
+-              }
+-              if (ads.ds_rxstatus8 & AR_DecryptCRCErr)
++              } else if (ads.ds_rxstatus8 & AR_DecryptCRCErr)
+                       rs->rs_status |= ATH9K_RXERR_DECRYPT;
+-              if (ads.ds_rxstatus8 & AR_MichaelErr)
++              else if (ads.ds_rxstatus8 & AR_MichaelErr)
+                       rs->rs_status |= ATH9K_RXERR_MIC;
++
+               if (ads.ds_rxstatus8 & AR_KeyMiss)
+                       rs->rs_status |= ATH9K_RXERR_DECRYPT;
+       }