RE: [PATCH 2/2] ath10k: Skip wait for delete response if firmware is down

[Rakesh Pillai]

> -----Original Message-----
> From: Ben Greear <greearb@xxxxxxxxxxxxxxx>
> Sent: Friday, June 26, 2020 11:57 PM
> To: Rakesh Pillai <pillair@xxxxxxxxxxxxxx>; ath10k@xxxxxxxxxxxxxxxxxxx
> Cc: linux-wireless@xxxxxxxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx
> Subject: Re: [PATCH 2/2] ath10k: Skip wait for delete response if firmware
is
> down
> 
> 
> 
> On 06/26/2020 11:11 AM, Rakesh Pillai wrote:
> > Currently the driver waits for response from the
> > firmware for all the delete cmds, eg: vdev_delete,
> > peer delete. If the firmware is down, these wait
> > will always timeout and return an error.
> >
> > Also during subsytems recovery, any attempt to
> > send a WMI cmd to the FW will return the -ESHUTDOWN
> > status, which when returned to mac80211, can cause
> > unnecessary warnings to be printed on to the console,
> > as shown below
> >
> > [ 2559.529565] Call trace:
> > [ 2559.532214]  __sta_info_destroy_part2+0x160/0x168 [mac80211]
> > [ 2559.538157]  __sta_info_flush+0x124/0x180 [mac80211]
> > [ 2559.543402]  ieee80211_set_disassoc+0x130/0x2c0 [mac80211]
> > [ 2559.549172]  ieee80211_mgd_deauth+0x238/0x25c [mac80211]
> > [ 2559.554764]  ieee80211_deauth+0x24/0x30 [mac80211]
> > [ 2559.559860]  cfg80211_mlme_deauth+0x258/0x2b0 [cfg80211]
> > [ 2559.565446]  nl80211_deauthenticate+0xe4/0x110 [cfg80211]
> > [ 2559.571064]  genl_rcv_msg+0x3a0/0x440
> > [ 2559.574888]  netlink_rcv_skb+0xb4/0x11c
> > [ 2559.578877]  genl_rcv+0x34/0x48
> > [ 2559.582162]  netlink_unicast+0x14c/0x1e4
> > [ 2559.586235]  netlink_sendmsg+0x2f0/0x360
> > [ 2559.590317]  sock_sendmsg+0x44/0x5c
> > [ 2559.593951]  ____sys_sendmsg+0x1c8/0x290
> > [ 2559.598029]  ___sys_sendmsg+0xa8/0xfc
> > [ 2559.601840]  __sys_sendmsg+0x8c/0xd0
> > [ 2559.605572]  __arm64_compat_sys_sendmsg+0x2c/0x38
> > [ 2559.610468]  el0_svc_common+0xa8/0x160
> > [ 2559.614372]  el0_svc_compat_handler+0x2c/0x38
> > [ 2559.618905]  el0_svc_compat+0x8/0x10
> >
> > Skip the wait for delete response from the
> > firmware if the firmware is down. Also return
> > success to the mac80211 calls when the peer delete
> > cmd fails with return status -ESHUTDOWN.
> >
> > Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.1-01040-QCAHLSWMTPLZ-1
> >
> > Signed-off-by: Rakesh Pillai <pillair@xxxxxxxxxxxxxx>
> > ---
> >  drivers/net/wireless/ath/ath10k/mac.c | 18 ++++++++++++++----
> >  1 file changed, 14 insertions(+), 4 deletions(-)
> >
> > diff --git a/drivers/net/wireless/ath/ath10k/mac.c
> b/drivers/net/wireless/ath/ath10k/mac.c
> > index dc7befc..7ac6549 100644
> > --- a/drivers/net/wireless/ath/ath10k/mac.c
> > +++ b/drivers/net/wireless/ath/ath10k/mac.c
> > @@ -701,7 +701,8 @@ static void
> ath10k_wait_for_peer_delete_done(struct ath10k *ar, u32 vdev_id,
> >  	unsigned long time_left;
> >  	int ret;
> >
> > -	if (test_bit(WMI_SERVICE_SYNC_DELETE_CMDS, ar->wmi.svc_map))
> {
> > +	if (test_bit(WMI_SERVICE_SYNC_DELETE_CMDS, ar->wmi.svc_map)
> &&
> > +	    test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags)) {
> 
> Don't you mean !test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags))
> ???
> 
> Or maybe I'm just mis-reading your patch?

Hi Ben,
Yes, it should be !test_bit(ATH10K_FLAG_CRASH_FLUSH, &ar->dev_flags)).
I will send out a v2.


> 
> Thanks,
> Ben
> 
> --
> Ben Greear <greearb@xxxxxxxxxxxxxxx>
> Candela Technologies Inc  http://www.candelatech.com