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[v2] ath10k: Fix crash during rmmod when probe firmware fails

Message ID 1482221135-23960-1-git-send-email-mohammed@qca.qualcomm.com (mailing list archive)
State Superseded
Delegated to: Kalle Valo
Headers show

Commit Message

Mohammed Shafi Shajakhan Dec. 20, 2016, 8:05 a.m. UTC
From: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com>

This fixes the below crash when ath10k probe firmware fails,
NAPI polling tries to access a rx ring resource which was never
allocated, fix this by disabling NAPI right away once the probe
firmware fails by calling 'ath10k_hif_stop'. Its good to note
that the error is never propogated to 'ath10k_pci_probe' when
ath10k_core_register fails, so calling 'ath10k_hif_stop' to cleanup
PCI related things seems to be ok

BUG: unable to handle kernel NULL pointer dereference at (null)
IP:  __ath10k_htt_rx_ring_fill_n+0x19/0x230 [ath10k_core]
__ath10k_htt_rx_ring_fill_n+0x19/0x230 [ath10k_core]

Call Trace:

[<ffffffffa113ec62>] ath10k_htt_rx_msdu_buff_replenish+0x42/0x90
[<ffffffffa113f393>] ath10k_htt_txrx_compl_task+0x433/0x17d0
[<ffffffff8114406d>] ? __wake_up_common+0x4d/0x80
[<ffffffff811349ec>] ? cpu_load_update+0xdc/0x150
[<ffffffffa119301d>] ? ath10k_pci_read32+0xd/0x10 [ath10k_pci]
[<ffffffffa1195b17>] ath10k_pci_napi_poll+0x47/0x110 [ath10k_pci]
[<ffffffff817863af>] net_rx_action+0x20f/0x370

Reported-by: Ben Greear <greearb@candelatech.com>
Fixes: 3c97f5de1f28 ("ath10k: implement NAPI support")

Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qti.qualcomm.com>
 drivers/net/wireless/ath/ath10k/core.c | 1 +
 1 file changed, 1 insertion(+)
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diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
index f7ea4de..15bccc9 100644
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -2164,6 +2164,7 @@  static int ath10k_core_probe_fw(struct ath10k *ar)
+	ath10k_hif_stop(ar);
 	return ret;