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Date: Sun, 27 Sep 2020 21:48:52 +0200
From: Thomas Gleixner <tglx@...utronix.de>
To: LKML <linux-kernel@...r.kernel.org>
Cc: Peter Zijlstra <peterz@...radead.org>,
Linus Torvalds <torvalds@...uxfoundation.org>,
Paul McKenney <paulmck@...nel.org>,
Matthew Wilcox <willy@...radead.org>,
Vishal Kulkarni <vishal@...lsio.com>,
"David S. Miller" <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org,
Christian Benvenuti <benve@...co.com>,
Govindarajulu Varadarajan <_govind@....com>,
Dave Miller <davem@...emloft.net>,
Jonathan Corbet <corbet@....net>,
Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
linux-doc@...r.kernel.org,
Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
Jay Cliburn <jcliburn@...il.com>,
Chris Snook <chris.snook@...il.com>,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
intel-wired-lan@...ts.osuosl.org,
Shannon Nelson <snelson@...sando.io>,
Pensando Drivers <drivers@...sando.io>,
Andrew Lunn <andrew@...n.ch>,
Heiner Kallweit <hkallweit1@...il.com>,
Russell King <linux@...linux.org.uk>,
Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
Edward Cree <ecree@...arflare.com>,
Martin Habets <mhabets@...arflare.com>,
Jon Mason <jdmason@...zu.us>, Daniel Drake <dsd@...too.org>,
Ulrich Kunitz <kune@...ne-taler.de>,
Kalle Valo <kvalo@...eaurora.org>,
linux-wireless@...r.kernel.org, linux-usb@...r.kernel.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Arend van Spriel <arend.vanspriel@...adcom.com>,
Franky Lin <franky.lin@...adcom.com>,
Hante Meuleman <hante.meuleman@...adcom.com>,
Chi-Hsien Lin <chi-hsien.lin@...ress.com>,
Wright Feng <wright.feng@...ress.com>,
brcm80211-dev-list.pdl@...adcom.com,
brcm80211-dev-list@...ress.com,
Stanislav Yakovlev <stas.yakovlev@...il.com>,
Stanislaw Gruszka <stf_xl@...pl>,
Johannes Berg <johannes.berg@...el.com>,
Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
Luca Coelho <luciano.coelho@...el.com>,
Intel Linux Wireless <linuxwifi@...el.com>,
Jouni Malinen <j@...fi>,
Amitkumar Karwar <amitkarwar@...il.com>,
Ganapathi Bhat <ganapathi.bhat@....com>,
Xinming Hu <huxinming820@...il.com>,
libertas-dev@...ts.infradead.org,
Pascal Terjan <pterjan@...gle.com>,
Ping-Ke Shih <pkshih@...ltek.com>
Subject: [patch 06/35] net: cxgb3: Cleanup in_interrupt() usage
From: Thomas Gleixner <tglx@...utronix.de>
t3_sge_stop() is called from task context and from error handlers in
interrupt context. It relies on in_interrupt() to differentiate the
contexts.
in_interrupt() is deprecated as it is ill defined and does not provide what
it suggests.
Instead of replacing it with some other construct, simply split the
function into t3_sge_stop_dma(), which can be called from any context, and
t3_sge_stop() which can be only called from task context.
This has the advantage that any bogus invocation of t3_sge_stop() from
wrong contexts can be caught by debug kernels instead of being papered over
by the conditional.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: Vishal Kulkarni <vishal@...lsio.com>
Cc: "David S. Miller" <davem@...emloft.net>
Cc: Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org
Cc: linux-kernel@...r.kernel.org
---
drivers/net/ethernet/chelsio/cxgb3/adapter.h | 1
drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c | 2 -
drivers/net/ethernet/chelsio/cxgb3/sge.c | 44 ++++++++++++++----------
3 files changed, 29 insertions(+), 18 deletions(-)
--- a/drivers/net/ethernet/chelsio/cxgb3/adapter.h
+++ b/drivers/net/ethernet/chelsio/cxgb3/adapter.h
@@ -313,6 +313,7 @@ void t3_os_link_fault(struct adapter *ad
void t3_os_link_fault_handler(struct adapter *adapter, int port_id);
void t3_sge_start(struct adapter *adap);
+void t3_sge_stop_dma(struct adapter *adap);
void t3_sge_stop(struct adapter *adap);
void t3_start_sge_timers(struct adapter *adap);
void t3_stop_sge_timers(struct adapter *adap);
--- a/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/cxgb3_main.c
@@ -2996,7 +2996,7 @@ void t3_fatal_err(struct adapter *adapte
unsigned int fw_status[4];
if (adapter->flags & FULL_INIT_DONE) {
- t3_sge_stop(adapter);
+ t3_sge_stop_dma(adapter);
t3_write_reg(adapter, A_XGM_TX_CTRL, 0);
t3_write_reg(adapter, A_XGM_RX_CTRL, 0);
t3_write_reg(adapter, XGM_REG(A_XGM_TX_CTRL, 1), 0);
--- a/drivers/net/ethernet/chelsio/cxgb3/sge.c
+++ b/drivers/net/ethernet/chelsio/cxgb3/sge.c
@@ -3271,30 +3271,40 @@ void t3_sge_start(struct adapter *adap)
}
/**
- * t3_sge_stop - disable SGE operation
+ * t3_sge_stop_dma - Disable SGE DMA engine operation
* @adap: the adapter
*
- * Disables the DMA engine. This can be called in emeregencies (e.g.,
- * from error interrupts) or from normal process context. In the latter
- * case it also disables any pending queue restart tasklets. Note that
- * if it is called in interrupt context it cannot disable the restart
- * tasklets as it cannot wait, however the tasklets will have no effect
- * since the doorbells are disabled and the driver will call this again
- * later from process context, at which time the tasklets will be stopped
- * if they are still running.
+ * Can be invoked from interrupt context e.g. error handler.
+ *
+ * Note that this function cannot disable the restart of tasklets as
+ * it cannot wait if called from interrupt context, however the
+ * tasklets will have no effect since the doorbells are disabled. The
+ * driver will call tg3_sge_stop() later from process context, at
+ * which time the tasklets will be stopped if they are still running.
*/
-void t3_sge_stop(struct adapter *adap)
+void t3_sge_stop_dma(struct adapter *adap)
{
t3_set_reg_field(adap, A_SG_CONTROL, F_GLOBALENABLE, 0);
- if (!in_interrupt()) {
- int i;
+}
+
+/**
+ * t3_sge_stop - disable SGE operation completly
+ * @adap: the adapter
+ *
+ * Called from process context. Disables the DMA engine and any
+ * pending queue restart tasklets.
+ */
+void t3_sge_stop(struct adapter *adap)
+{
+ int i;
+
+ t3_sge_stop_dma(adap);
- for (i = 0; i < SGE_QSETS; ++i) {
- struct sge_qset *qs = &adap->sge.qs[i];
+ for (i = 0; i < SGE_QSETS; ++i) {
+ struct sge_qset *qs = &adap->sge.qs[i];
- tasklet_kill(&qs->txq[TXQ_OFLD].qresume_tsk);
- tasklet_kill(&qs->txq[TXQ_CTRL].qresume_tsk);
- }
+ tasklet_kill(&qs->txq[TXQ_OFLD].qresume_tsk);
+ tasklet_kill(&qs->txq[TXQ_CTRL].qresume_tsk);
}
}
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