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ath9k: Fix rx overrun interrupt storm 

Whenever RXEOL is received, both RXORN and RXEOL got cleared
to avoid rx overrun interrupt storm. This was handled only for
edma chips. The same scenario was also observered with AR9280,
doing frequent channel type switch b/w HT20/40 with bidi traffic
that is causing failure to stop rx dma. This patch clears
the RXEOL & RXORN interrupts for all chips.

ath: DMA failed to stop in 10 ms AR_CR=0x00000024 AR_DIAG_SW=0x42000020
DMADBG_7=0x000062c0
ath: Could not stop RX, we could be confusing the DMA engine when we
start RX up
------------[ cut here ]------------
WARNING: at drivers/net/wireless/ath/ath9k/recv.c:532
ath_stoprecv+0x110/0x120 [ath9k]()
Call Trace:
 [<ffffffff8104a55a>] warn_slowpath_common+0x7a/0xb0
 [<ffffffff8104a5a5>] warn_slowpath_null+0x15/0x20
 [<ffffffffa0560380>] ath_stoprecv+0x110/0x120 [ath9k]
 [<ffffffffa055e6fa>] ath_reset+0x6a/0x200 [ath9k]

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Rajkumar Manoharan 2011-08-13 10:28:09 +05:30 committed by John W. Linville
parent 7a12dfdbf5
commit 0682c9b52b
1 changed files with 3 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/wireless/ath/ath9k/main.c
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@ -826,11 +826,9 @@ irqreturn_t ath_isr(int irq, void *dev)
if (status & ATH9K_INT_TXURN) if (status & ATH9K_INT_TXURN)
ath9k_hw_updatetxtriglevel(ah, true); ath9k_hw_updatetxtriglevel(ah, true);
if (ah->caps.hw_caps & ATH9K_HW_CAP_EDMA) { if (status & ATH9K_INT_RXEOL) {
if (status & ATH9K_INT_RXEOL) { ah->imask &= ~(ATH9K_INT_RXEOL | ATH9K_INT_RXORN);
ah->imask &= ~(ATH9K_INT_RXEOL | ATH9K_INT_RXORN); ath9k_hw_set_interrupts(ah, ah->imask);
ath9k_hw_set_interrupts(ah, ah->imask);
}
} }
if (status & ATH9K_INT_MIB) { if (status & ATH9K_INT_MIB) {