Oleksij Rempel [off-list ref] writes:

Am 29.01.2015 um 05:09 schrieb zhengyuwei@360.cn:

quoted

From: Yuwei Zheng <redacted>

In the environment with heavy wifi traffic, set the ar9271 into monitor mode, will
trigger a deadloop panic. 

The ath9k_hif_usb_rx_cb function excute on  the interrupt context, and ath9k_rx_tasklet excute
on the soft irq context. In other words, the ath9k_hif_usb_rx_cb have more chance to excute than
ath9k_rx_tasklet.  So in the worst condition,  the rx.rxbuf receive list is always full,
and the do {}while(true) loop will not be break. The kernel get a soft lockup panic.  
  
[59011.007210] BUG: soft lockup - CPU#0 stuck for 23s! 
[kworker/0:0:30609]
[59011.030560] BUG: scheduling while atomic: kworker/0:0/30609/0x40010100
[59013.804486] BUG: scheduling while atomic: kworker/0:0/30609/0x40010100
[59013.858522] Kernel panic - not syncing: softlockup: hung tasks

[59014.038891] Exception stack(0xdf4bbc38 to 0xdf4bbc80)
[59014.046834] bc20:                                                       de57b950 60000113
[59014.059579] bc40: 00000000 bb32bb32 60000113 de57b948 de57b500 dc7bb440 df4bbcd0 00000000
[59014.072337] bc60: de57b950 60000113 df4bbcd0 df4bbc80 c04c259d c04c25a0 60000133 ffffffff
[59014.085233] [<c04c28db>] (__irq_svc+0x3b/0x5c) from [<c04c25a0>] (_raw_spin_unlock_irqrestore+0xc/0x10)
[59014.100437] [<c04c25a0>] (_raw_spin_unlock_irqrestore+0xc/0x10) from [<bf9c2089>] (ath9k_rx_tasklet+0x290/0x490 [ath9k_htc])
[59014.118267] [<bf9c2089>] (ath9k_rx_tasklet+0x290/0x490 [ath9k_htc]) from [<c0036d23>] (tasklet_action+0x3b/0x98)
[59014.134132] [<c0036d23>] (tasklet_action+0x3b/0x98) from [<c0036709>] (__do_softirq+0x99/0x16c)
[59014.147784] [<c0036709>] (__do_softirq+0x99/0x16c) from [<c00369f7>] (irq_exit+0x5b/0x5c)
[59014.160653] [<c00369f7>] (irq_exit+0x5b/0x5c) from [<c000cfc3>] (handle_IRQ+0x37/0x78)
[59014.173124] [<c000cfc3>] (handle_IRQ+0x37/0x78) from [<c00085df>] (omap3_intc_handle_irq+0x5f/0x68)
[59014.187225] [<c00085df>] (omap3_intc_handle_irq+0x5f/0x68) from [<c04c28db>](__irq_svc+0x3b/0x5c)

This bug can be see with low performance board, such as uniprocessor beagle bone board.
Signed-off-by: Yuwei Zheng <redacted>

---
 drivers/net/wireless/ath/ath9k/hif_usb.c       | 53 ++++++++++++++++++++++----
 drivers/net/wireless/ath/ath9k/hif_usb.h       |  5 +++
 drivers/net/wireless/ath/ath9k/htc.h           | 13 +++++++
 drivers/net/wireless/ath/ath9k/htc_drv_debug.c | 49 ++++++++++++++++++++++++
 drivers/net/wireless/ath/ath9k/htc_drv_txrx.c  | 26 +++++++++++++
 5 files changed, 139 insertions(+), 7 deletions(-)

First of all, thank you for you work! :D

Please run ./scripts/checkpatch.pl yourpatch_path
i get:
total: 139 errors, 12 warnings, 2 checks, 231 lines checked

Also please add "ath9k_htc:" prefix to the title.

-- 
Kalle Valo