From: Thomas Gleixner <tglx@linutronix.de>
To: LKML <linux-kernel@vger.kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>,
Paul McKenney <paulmck@kernel.org>,
Matthew Wilcox <willy@infradead.org>,
Christian Benvenuti <benve@cisco.com>,
Govindarajulu Varadarajan <_govind@gmx.com>,
Dave Miller <davem@davemloft.net>,
Jakub Kicinski <kuba@kernel.org>,
netdev@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
Mauro Carvalho Chehab <mchehab+huawei@kernel.org>,
linux-doc@vger.kernel.org,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Jay Cliburn <jcliburn@gmail.com>,
Chris Snook <chris.snook@gmail.com>,
Vishal Kulkarni <vishal@chelsio.com>,
Jeff Kirsher <jeffrey.t.kirsher@intel.com>,
intel-wired-lan@lists.osuosl.org,
Shannon Nelson <snelson@pensando.io>,
Pensando Drivers <drivers@pensando.io>,
Andrew Lunn <andrew@lunn.ch>,
Heiner Kallweit <hkallweit1@gmail.com>,
Russell King <linux@armlinux.org.uk>,
Thomas Bogendoerfer <tsbogend@alpha.franken.de>,
Solarflare linux maintainers <linux-net-drivers@solarflare.com>,
Edward Cree <ecree@solarflare.com>,
Martin Habets <mhabets@solarflare.com>,
Jon Mason <jdmason@kudzu.us>, Daniel Drake <dsd@gentoo.org>,
Ulrich Kunitz <kune@deine-taler.de>,
Kalle Valo <kvalo@codeaurora.org>,
linux-wireless@vger.kernel.org, linux-usb@vger.kernel.org,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Arend van Spriel <arend.vanspriel@broadcom.com>,
Franky Lin <franky.lin@broadcom.com>,
Hante Meuleman <hante.meuleman@broadcom.com>,
Chi-Hsien Lin <chi-hsien.lin@cypress.com>,
Wright Feng <wright.feng@cypress.com>,
brcm80211-dev-list.pdl@broadcom.com,
brcm80211-dev-list@cypress.com,
Stanislav Yakovlev <stas.yakovlev@gmail.com>,
Stanislaw Gruszka <stf_xl@wp.pl>,
Johannes Berg <johannes.berg@intel.com>,
Emmanuel Grumbach <emmanuel.grumbach@intel.com>,
Luca Coelho <luciano.coelho@intel.com>,
Intel Linux Wireless <linuxwifi@intel.com>,
Jouni Malinen <j@w1.fi>, Amitkumar Karwar <amitkarwar@gmail.com>,
Ganapathi Bhat <ganapathi.bhat@nxp.com>,
Xinming Hu <huxinming820@gmail.com>,
libertas-dev@lists.infradead.org,
Pascal Terjan <pterjan@google.com>,
Ping-Ke Shih <pkshih@realtek.com>
Subject: [patch V2 36/36] net: rtlwifi: Replace in_interrupt() for context detection
Date: Tue, 29 Sep 2020 22:25:45 +0200 [thread overview]
Message-ID: <20200929203503.060446484@linutronix.de> (raw)
In-Reply-To: 20200929202509.673358734@linutronix.de
From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
rtl_lps_enter() and rtl_lps_leave() are using in_interrupt() to detect
whether it is safe to acquire a mutex or if it is required to defer to a
workqueue.
The usage of in_interrupt() in drivers is phased out and Linus clearly
requested that code which changes behaviour depending on context should
either be seperated or the context be conveyed in an argument passed by the
caller, which usually knows the context.
in_interrupt() also is only partially correct because it fails to chose the
correct code path when just preemption or interrupts are disabled.
Add an argument 'may_block' to both functions and adjust the callers to
pass the context information.
The following call chains were analyzed to be safe to block:
rtl_watchdog_wq_callback()
rlf_lps_leave/enter()
rtl_op_suspend()
rtl_lps_leave()
rtl_op_bss_info_changed()
rtl_lps_leave()
rtl_op_sw_scan_start()
rtl_lps_leave()
The following call chains were analyzed to be unsafe to block:
_rtl_pci_interrupt()
_rtl_pci_rx_interrupt()
rtl_lps_leave()
_rtl_pci_interrupt()
_rtl_pci_rx_interrupt()
rtl_is_special_data()
rtl_lps_leave()
_rtl_pci_interrupt()
_rtl_pci_rx_interrupt()
rtl_is_special_data()
setup_special_tx()
rtl_lps_leave()
_rtl_pci_interrupt()
_rtl_pci_tx_isr
rtl_lps_leave()
halbtc_leave_lps()
rtl_lps_leave()
This leaves four callers of rtl_lps_enter/leave() where the analyzis
stopped dead in the maze of several nested pointer based callchains and
lack of rtlwifi hardware to debug this via tracing:
halbtc_leave_lps(), halbtc_enter_lps(), halbtc_normal_lps(),
halbtc_pre_normal_lps()
These four have been cautionally marked to be unable to block which is the
safe option, but the rtwifi wizards should be able to clarify that.
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Kalle Valo <kvalo@codeaurora.org>
---
drivers/net/wireless/realtek/rtlwifi/base.c | 8 +++---
drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c | 12 ++++++----
drivers/net/wireless/realtek/rtlwifi/core.c | 6 ++---
drivers/net/wireless/realtek/rtlwifi/pci.c | 4 +--
drivers/net/wireless/realtek/rtlwifi/ps.c | 8 +++---
drivers/net/wireless/realtek/rtlwifi/ps.h | 4 +--
6 files changed, 23 insertions(+), 19 deletions(-)
--- a/drivers/net/wireless/realtek/rtlwifi/base.c
+++ b/drivers/net/wireless/realtek/rtlwifi/base.c
@@ -1456,7 +1456,7 @@ static void setup_special_tx(struct rtl_
if (rtlpriv->cfg->ops->get_btc_status())
rtlpriv->btcoexist.btc_ops->btc_special_packet_notify(
rtlpriv, type);
- rtl_lps_leave(hw);
+ rtl_lps_leave(hw, false);
ppsc->last_delaylps_stamp_jiffies = jiffies;
}
@@ -1546,7 +1546,7 @@ u8 rtl_is_special_data(struct ieee80211_
if (is_tx) {
rtlpriv->ra.is_special_data = true;
- rtl_lps_leave(hw);
+ rtl_lps_leave(hw, false);
ppsc->last_delaylps_stamp_jiffies = jiffies;
setup_special_tx(rtlpriv, ppsc, PACKET_EAPOL);
@@ -2147,9 +2147,9 @@ static void rtl_watchdog_wq_callback(str
if (rtlpriv->link_info.num_rx_inperiod +
rtlpriv->link_info.num_tx_inperiod > 8 ||
rtlpriv->link_info.num_rx_inperiod > 2)
- rtl_lps_leave(hw);
+ rtl_lps_leave(hw, true);
else
- rtl_lps_enter(hw);
+ rtl_lps_enter(hw, true);
label_lps_done:
;
--- a/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
+++ b/drivers/net/wireless/realtek/rtlwifi/btcoexist/halbtcoutsrc.c
@@ -285,7 +285,8 @@ static void halbtc_leave_lps(struct btc_
btcoexist->bt_info.bt_ctrl_lps = true;
btcoexist->bt_info.bt_lps_on = false;
- rtl_lps_leave(rtlpriv->mac80211.hw);
+ /* FIXME: Context is unclear. Is it allowed to block? */
+ rtl_lps_leave(rtlpriv->mac80211.hw, false);
}
static void halbtc_enter_lps(struct btc_coexist *btcoexist)
@@ -306,7 +307,8 @@ static void halbtc_enter_lps(struct btc_
btcoexist->bt_info.bt_ctrl_lps = true;
btcoexist->bt_info.bt_lps_on = true;
- rtl_lps_enter(rtlpriv->mac80211.hw);
+ /* FIXME: Context is unclear. Is it allowed to block? */
+ rtl_lps_enter(rtlpriv->mac80211.hw, false);
}
static void halbtc_normal_lps(struct btc_coexist *btcoexist)
@@ -317,7 +319,8 @@ static void halbtc_normal_lps(struct btc
if (btcoexist->bt_info.bt_ctrl_lps) {
btcoexist->bt_info.bt_lps_on = false;
- rtl_lps_leave(rtlpriv->mac80211.hw);
+ /* FIXME: Context is unclear. Is it allowed to block? */
+ rtl_lps_leave(rtlpriv->mac80211.hw, false);
btcoexist->bt_info.bt_ctrl_lps = false;
}
}
@@ -328,7 +331,8 @@ static void halbtc_pre_normal_lps(struct
if (btcoexist->bt_info.bt_ctrl_lps) {
btcoexist->bt_info.bt_lps_on = false;
- rtl_lps_leave(rtlpriv->mac80211.hw);
+ /* FIXME: Context is unclear. Is it allowed to block? */
+ rtl_lps_leave(rtlpriv->mac80211.hw, false);
}
}
--- a/drivers/net/wireless/realtek/rtlwifi/core.c
+++ b/drivers/net/wireless/realtek/rtlwifi/core.c
@@ -544,7 +544,7 @@ static int rtl_op_suspend(struct ieee802
rtlhal->driver_is_goingto_unload = true;
rtlhal->enter_pnp_sleep = true;
- rtl_lps_leave(hw);
+ rtl_lps_leave(hw, true);
rtl_op_stop(hw);
device_set_wakeup_enable(wiphy_dev(hw->wiphy), true);
return 0;
@@ -1151,7 +1151,7 @@ static void rtl_op_bss_info_changed(stru
mstatus = RT_MEDIA_DISCONNECT;
if (mac->link_state == MAC80211_LINKED)
- rtl_lps_leave(hw);
+ rtl_lps_leave(hw, true);
if (ppsc->p2p_ps_info.p2p_ps_mode > P2P_PS_NONE)
rtl_p2p_ps_cmd(hw, P2P_PS_DISABLE);
mac->link_state = MAC80211_NOLINK;
@@ -1448,7 +1448,7 @@ static void rtl_op_sw_scan_start(struct
}
if (mac->link_state == MAC80211_LINKED) {
- rtl_lps_leave(hw);
+ rtl_lps_leave(hw, true);
mac->link_state = MAC80211_LINKED_SCANNING;
} else {
rtl_ips_nic_on(hw);
--- a/drivers/net/wireless/realtek/rtlwifi/pci.c
+++ b/drivers/net/wireless/realtek/rtlwifi/pci.c
@@ -621,7 +621,7 @@ static void _rtl_pci_tx_isr(struct ieee8
if (((rtlpriv->link_info.num_rx_inperiod +
rtlpriv->link_info.num_tx_inperiod) > 8) ||
rtlpriv->link_info.num_rx_inperiod > 2)
- rtl_lps_leave(hw);
+ rtl_lps_leave(hw, false);
}
static int _rtl_pci_init_one_rxdesc(struct ieee80211_hw *hw,
@@ -874,7 +874,7 @@ static void _rtl_pci_rx_interrupt(struct
if (((rtlpriv->link_info.num_rx_inperiod +
rtlpriv->link_info.num_tx_inperiod) > 8) ||
rtlpriv->link_info.num_rx_inperiod > 2)
- rtl_lps_leave(hw);
+ rtl_lps_leave(hw, false);
skb = new_skb;
no_new:
if (rtlpriv->use_new_trx_flow) {
--- a/drivers/net/wireless/realtek/rtlwifi/ps.c
+++ b/drivers/net/wireless/realtek/rtlwifi/ps.c
@@ -653,22 +653,22 @@ void rtl_lps_change_work_callback(struct
}
EXPORT_SYMBOL_GPL(rtl_lps_change_work_callback);
-void rtl_lps_enter(struct ieee80211_hw *hw)
+void rtl_lps_enter(struct ieee80211_hw *hw, bool may_block)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
- if (!in_interrupt())
+ if (may_block)
return rtl_lps_enter_core(hw);
rtlpriv->enter_ps = true;
schedule_work(&rtlpriv->works.lps_change_work);
}
EXPORT_SYMBOL_GPL(rtl_lps_enter);
-void rtl_lps_leave(struct ieee80211_hw *hw)
+void rtl_lps_leave(struct ieee80211_hw *hw, bool may_block)
{
struct rtl_priv *rtlpriv = rtl_priv(hw);
- if (!in_interrupt())
+ if (may_block)
return rtl_lps_leave_core(hw);
rtlpriv->enter_ps = false;
schedule_work(&rtlpriv->works.lps_change_work);
--- a/drivers/net/wireless/realtek/rtlwifi/ps.h
+++ b/drivers/net/wireless/realtek/rtlwifi/ps.h
@@ -11,8 +11,8 @@ bool rtl_ps_disable_nic(struct ieee80211
void rtl_ips_nic_off(struct ieee80211_hw *hw);
void rtl_ips_nic_on(struct ieee80211_hw *hw);
void rtl_ips_nic_off_wq_callback(struct work_struct *work);
-void rtl_lps_enter(struct ieee80211_hw *hw);
-void rtl_lps_leave(struct ieee80211_hw *hw);
+void rtl_lps_enter(struct ieee80211_hw *hw, bool may_block);
+void rtl_lps_leave(struct ieee80211_hw *hw, bool may_block);
void rtl_lps_set_psmode(struct ieee80211_hw *hw, u8 rt_psmode);
next prev parent reply other threads:[~2020-09-29 20:37 UTC|newest]
Thread overview: 44+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-29 20:25 [patch V2 00/36] net: in_interrupt() cleanup and fixes Thomas Gleixner
2020-09-29 20:25 ` [patch V2 01/36] net: enic: Cure the enic api locking trainwreck Thomas Gleixner
2020-09-29 20:25 ` [patch V2 02/36] net: caif: Remove unused caif SPI driver Thomas Gleixner
2020-09-29 20:25 ` [patch V2 03/36] net: Add netif_rx_any_context() Thomas Gleixner
2020-09-29 20:25 ` [patch V2 04/36] net: caif: Use netif_rx_any_context() Thomas Gleixner
2020-09-29 20:25 ` [patch V2 05/36] net: atheros: Remove WARN_ON(in_interrupt()) Thomas Gleixner
2020-09-29 20:25 ` [patch V2 06/36] net: cxgb3: Cleanup in_interrupt() usage Thomas Gleixner
2020-09-29 20:25 ` [patch V2 07/36] net: cxbg4: Remove pointless in_interrupt() check Thomas Gleixner
2020-09-29 20:25 ` [patch V2 08/36] net: e100: Remove in_interrupt() usage and pointless GFP_ATOMIC allocation Thomas Gleixner
2020-09-29 20:25 ` [patch V2 09/36] net: fec_mpc52xx: Replace in_interrupt() usage Thomas Gleixner
2020-09-29 20:25 ` [patch V2 10/36] net: intel: Remove in_interrupt() warnings Thomas Gleixner
2020-09-29 20:25 ` [patch V2 11/36] net: ionic: Replace in_interrupt() usage Thomas Gleixner
2020-09-29 23:06 ` Shannon Nelson
2020-09-29 20:25 ` [patch V2 12/36] net: ionic: Remove WARN_ON(in_interrupt()) Thomas Gleixner
2020-09-29 20:25 ` [patch V2 13/36] net: mdiobus: Remove WARN_ON_ONCE(in_interrupt()) Thomas Gleixner
2020-09-29 20:25 ` [patch V2 14/36] net: natsemi: Replace in_interrupt() usage Thomas Gleixner
2020-09-29 20:25 ` [patch V2 15/36] net: sfc: " Thomas Gleixner
2020-09-29 20:25 ` [patch V2 16/36] net: sfc: Use GFP_KERNEL in efx_ef10_try_update_nic_stats() Thomas Gleixner
2020-09-30 8:00 ` Martin Habets
2020-09-29 20:25 ` [patch V2 17/36] net: sunbmac: Replace in_interrupt() usage Thomas Gleixner
2020-09-29 20:25 ` [patch V2 18/36] net: sun3lance: Remove redundant checks in interrupt handler Thomas Gleixner
2020-09-29 20:25 ` [patch V2 19/36] net: vxge: Remove in_interrupt() conditionals Thomas Gleixner
2020-09-29 20:25 ` [patch V2 20/36] net: zd1211rw: Remove ZD_ASSERT(in_interrupt()) Thomas Gleixner
2020-09-29 20:25 ` [patch V2 21/36] net: usb: kaweth: Replace kaweth_control() with usb_control_msg() Thomas Gleixner
2020-09-30 6:22 ` Greg Kroah-Hartman
2020-09-29 20:25 ` [patch V2 22/36] net: usb: kaweth: Remove last user of kaweth_control() Thomas Gleixner
2020-09-29 20:25 ` [patch V2 23/36] net: usb: net1080: Remove in_interrupt() comment Thomas Gleixner
2020-09-29 20:25 ` [patch V2 24/36] net: wan/lmc: Remove lmc_trace() Thomas Gleixner
2020-09-29 20:25 ` [patch V2 25/36] net: brcmfmac: Replace in_interrupt() Thomas Gleixner
2020-09-29 20:25 ` [patch V2 26/36] net: brcmfmac: Convey execution context via argument to brcmf_netif_rx() Thomas Gleixner
2020-09-29 22:03 ` Arend Van Spriel
2020-09-29 20:25 ` [patch V2 27/36] net: brcmfmac: Convey allocation mode as argument Thomas Gleixner
2020-09-29 22:07 ` Arend Van Spriel
2020-09-29 20:25 ` [patch V2 28/36] net: ipw2x00,iwlegacy,iwlwifi: Remove in_interrupt() from debug macros Thomas Gleixner
2020-09-29 20:25 ` [patch V2 29/36] net: iwlwifi: Remove in_interrupt() from tracing macro Thomas Gleixner
2020-09-29 20:25 ` [patch V2 30/36] net: hostap: Remove in_interrupt() usage Thomas Gleixner
2020-09-29 20:25 ` [patch V2 31/36] net: mwifiex: Use netif_rx_any_context() Thomas Gleixner
2020-09-29 20:25 ` [patch V2 32/36] net: libertas libertas_tf: Remove in_interrupt() from debug macro Thomas Gleixner
2020-09-29 20:25 ` [patch V2 33/36] net: libertas: Use netif_rx_any_context() Thomas Gleixner
2020-09-29 21:53 ` James Cameron
2020-09-29 20:25 ` [patch V2 34/36] net: rtlwifi: Remove void* casts related to delayed work Thomas Gleixner
2020-09-29 20:25 ` [patch V2 35/36] net: rtlwifi: Remove in_interrupt() from debug macro Thomas Gleixner
2020-09-29 20:25 ` Thomas Gleixner [this message]
2020-09-29 21:22 ` [patch V2 00/36] net: in_interrupt() cleanup and fixes David Miller
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