From 2124ddf8032f814b4bc6e785f152a4db7baaff3b Mon Sep 17 00:00:00 2001 From: Kalle Valo <kvalo@qca.qualcomm.com> Date: Mon, 13 Jun 2011 11:54:06 +0300 Subject: ath6kl: fix crash when interface is closed but scan is ongoing commit 98ab5c7755b5cc9e1a8f2a57ccb22eac5e13ec50 upstream. When ath6kl module was resumed while a scan was ongoing, for example during suspend, the driver would crash in ar6k_cfg80211_scanComplete_event(): [26581.586440] Call Trace: [26581.586440] [<f99ffeda>] ? ar6k_cfg80211_scanComplete_event+0xaa/0xaa [ath6kl] [26581.586440] [<f9a0a020>] wmi_iterate_nodes+0xb/0xd [ath6kl] [26581.586440] [<f99ffe78>] ar6k_cfg80211_scanComplete_event+0x48/0xaa [ath6kl] [26581.586440] [<f9a038ae>] ar6000_close+0x77/0x7e [ath6kl] [26581.586440] [<c139c25d>] __dev_close_many+0x87/0xab [26581.586440] [<c139c30a>] dev_close_many+0x54/0xab [26581.586440] [<c139c437>] rollback_registered_many+0xa5/0x19e [26581.586440] [<c139c595>] rollback_registered+0x23/0x2f [26581.586440] [<c139c5ed>] unregister_netdevice_queue+0x4c/0x69 [26581.586440] [<c139c6b2>] unregister_netdev+0x18/0x1f [26581.586440] [<f9a00d4c>] ar6000_destroy+0xf8/0x115 [ath6kl] [26581.586440] [<f9a0c765>] ar6k_cleanup_module+0x20/0x29 [ath6kl] [26581.586440] [<c1062843>] sys_delete_module+0x181/0x1d9 [26581.586440] [<c105876b>] ? lock_release_holdtime+0x2b/0xcd [26581.586440] [<c10b55dc>] ? sys_munmap+0x3b/0x42 [26581.586440] [<c14a99dc>] ? restore_all+0xf/0xf [26581.586440] [<c14aeb6c>] sysenter_do_call+0x12/0x32 [26581.586440] Code: 89 53 6c 75 07 89 d8 e8 c0 ff ff ff 89 f0 e8 2c f2 a9 c7 5b 5e 5d c3 55 89 e5 57 56 53 89 c3 83 ec 08 89 55 f0 8d 78 04 89 4d ec <8b> b0 b8 00 00 00 46 89 b0 b8 00 00 00 89 f8 e8 ae ed a9 c7 8b Fix the function not to iterate nodes when the scan is aborted. The nodes are already freed when the module is being unloaded. Patch "ath6kl: Fix a kernel panic furing suspend/resume" tried to fix this already but it wasn't enough as a pointer was still used even after the null check. This patch removes the null check entirely as the wmi structure is not accessed anymore during module unload. Also fix a bug where the status was checked as a bitfield with '&' operator. But it's not a bitfield, just a regular (enum like) value. Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/staging/ath6kl/os/linux/cfg80211.c | 31 +++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-) (limited to 'drivers/staging') diff --git a/drivers/staging/ath6kl/os/linux/cfg80211.c b/drivers/staging/ath6kl/os/linux/cfg80211.c index d3a774dbb7e..32e319782f2 100644 --- a/drivers/staging/ath6kl/os/linux/cfg80211.c +++ b/drivers/staging/ath6kl/os/linux/cfg80211.c @@ -867,26 +867,31 @@ ar6k_cfg80211_scanComplete_event(struct ar6_softc *ar, int status) AR_DEBUG_PRINTF(ATH_DEBUG_INFO, ("%s: status %d\n", __func__, status)); - if(ar->scan_request) - { - /* Translate data to cfg80211 mgmt format */ - if (ar->arWmi) - wmi_iterate_nodes(ar->arWmi, ar6k_cfg80211_scan_node, ar->wdev->wiphy); + if (!ar->scan_request) + return; + + if ((status == A_ECANCELED) || (status == A_EBUSY)) { + cfg80211_scan_done(ar->scan_request, true); + goto out; + } + + /* Translate data to cfg80211 mgmt format */ + wmi_iterate_nodes(ar->arWmi, ar6k_cfg80211_scan_node, ar->wdev->wiphy); - cfg80211_scan_done(ar->scan_request, - ((status & A_ECANCELED) || (status & A_EBUSY)) ? true : false); + cfg80211_scan_done(ar->scan_request, false); - if(ar->scan_request->n_ssids && - ar->scan_request->ssids[0].ssid_len) { + if(ar->scan_request->n_ssids && + ar->scan_request->ssids[0].ssid_len) { u8 i; for (i = 0; i < ar->scan_request->n_ssids; i++) { - wmi_probedSsid_cmd(ar->arWmi, i+1, DISABLE_SSID_FLAG, - 0, NULL); + wmi_probedSsid_cmd(ar->arWmi, i+1, DISABLE_SSID_FLAG, + 0, NULL); } - } - ar->scan_request = NULL; } + +out: + ar->scan_request = NULL; } static int -- cgit v1.2.3-18-g5258