[kernel] Add patch to fix ath9k dma stop checks (rhbz 892811)

[Josh Boyer]

commit 27e48a69995096472390d6e9a87d58502c88e47f
Author: Josh Boyer <jwboyer at redhat.com>
Date:   Wed Feb 6 09:57:47 2013 -0500

    Add patch to fix ath9k dma stop checks (rhbz 892811)

 ath9k_rx_dma_stop_check.patch |   28 ++++++++++++++++++++++++++++
 kernel.spec                   |   11 ++++++++++-
 2 files changed, 38 insertions(+), 1 deletions(-)
---
diff --git a/ath9k_rx_dma_stop_check.patch b/ath9k_rx_dma_stop_check.patch
new file mode 100644
index 0000000..606eb1c
--- /dev/null
+++ b/ath9k_rx_dma_stop_check.patch
@@ -0,0 +1,28 @@
+--- a/drivers/net/wireless/ath/ath9k/mac.c
++++ b/drivers/net/wireless/ath/ath9k/mac.c
+@@ -689,7 +689,7 @@ bool ath9k_hw_stopdmarecv(struct ath_hw 
+ {
+ #define AH_RX_STOP_DMA_TIMEOUT 10000   /* usec */
+ 	struct ath_common *common = ath9k_hw_common(ah);
+-	u32 mac_status, last_mac_status = 0;
++	u32 mac_status = 0, last_mac_status = 0;
+ 	int i;
+ 
+ 	/* Enable access to the DMA observation bus */
+@@ -719,6 +719,16 @@ bool ath9k_hw_stopdmarecv(struct ath_hw 
+ 	}
+ 
+ 	if (i == 0) {
++		if (!AR_SREV_9300_20_OR_LATER(ah) &&
++		    (mac_status & 0x700) == 0) {
++			/*
++			 * DMA is idle but the MAC is still stuck
++			 * processing events
++			 */
++			*reset = true;
++			return true;
++		}
++
+ 		ath_err(common,
+ 			"DMA failed to stop in %d ms AR_CR=0x%08x AR_DIAG_SW=0x%08x DMADBG_7=0x%08x\n",
+ 			AH_RX_STOP_DMA_TIMEOUT / 1000,
diff --git a/kernel.spec b/kernel.spec
index 0ca562d..8302448 100644
--- a/kernel.spec
+++ b/kernel.spec
@@ -62,7 +62,7 @@ Summary: The Linux kernel
 # For non-released -rc kernels, this will be appended after the rcX and
 # gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
 #
-%global baserelease 1
+%global baserelease 2
 %global fedora_build %{baserelease}
 
 # base_sublevel is the kernel version we're starting with and patching
@@ -755,6 +755,9 @@ Patch21244: iwlegacy-add-flush-callback.patch
 #rhbz 903881
 Patch21246: rtlwifi-Fix-scheduling-while-atomic-bug.patch
 
+#rhbz 892811
+Patch21247: ath9k_rx_dma_stop_check.patch
+
 # END OF PATCH DEFINITIONS
 
 %endif
@@ -1460,6 +1463,9 @@ ApplyPatch iwlegacy-add-flush-callback.patch
 #rhbz 903881
 ApplyPatch rtlwifi-Fix-scheduling-while-atomic-bug.patch
 
+#rhbz 892811
+ApplyPatch ath9k_rx_dma_stop_check.patch
+
 # END OF PATCH APPLICATIONS
 
 %endif
@@ -2315,6 +2321,9 @@ fi
 #                 ||----w |
 #                 ||     ||
 %changelog
+* Wed Feb 06 2013 Josh Boyer <jwboyer at redhat.com>
+- Add patch to fix ath9k dma stop checks (rhbz 892811)
+
 * Wed Feb 06 2013 Josh Boyer <jwboyer at redhat.com> - 3.8.0-0.rc6.git3.1
 - Linux v3.8-rc6-98-g1589a3e
 - Add patch to honor MokSBState (rhbz 907406)