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Message-Id: <20210309084242.616379058@linutronix.de>
Date:   Tue, 09 Mar 2021 09:42:16 +0100
From:   Thomas Gleixner <tglx@linutronix.de>
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     Frederic Weisbecker <frederic@kernel.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        "Ahmed S. Darwish" <a.darwish@linutronix.de>,
        Stefan Richter <stefanr@s5r6.in-berlin.de>,
        linux1394-devel@lists.sourceforge.net,
        Peter Zijlstra <peterz@infradead.org>,
        Denis Kirjanov <kda@linux-powerpc.org>,
        "David S. Miller" <davem@davemloft.net>,
        Jakub Kicinski <kuba@kernel.org>, netdev@vger.kernel.org,
        ath9k-devel@qca.qualcomm.com, Kalle Valo <kvalo@codeaurora.org>,
        linux-wireless@vger.kernel.org, Chas Williams <3chas3@gmail.com>,
        linux-atm-general@lists.sourceforge.net,
        "K. Y. Srinivasan" <kys@microsoft.com>,
        Haiyang Zhang <haiyangz@microsoft.com>,
        Stephen Hemminger <sthemmin@microsoft.com>,
        Wei Liu <wei.liu@kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Rob Herring <robh@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org
Subject: [patch 13/14] firewire: ohci: Use tasklet_disable_in_atomic() where required
References: <20210309084203.995862150@linutronix.de>
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

tasklet_disable() is invoked in several places. Some of them are in atomic
context which prevents a conversion of tasklet_disable() to a sleepable
function.

The atomic callchains are:

 ar_context_tasklet()
   ohci_cancel_packet()
     tasklet_disable()

 ...
   ohci_flush_iso_completions()
     tasklet_disable()

The invocation of tasklet_disable() from at_context_flush() is always in
preemptible context.

Use tasklet_disable_in_atomic() for the two invocations in
ohci_cancel_packet() and ohci_flush_iso_completions().

Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Stefan Richter <stefanr@s5r6.in-berlin.de>
Cc: linux1394-devel@lists.sourceforge.net
---
 drivers/firewire/ohci.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -2545,7 +2545,7 @@ static int ohci_cancel_packet(struct fw_
 	struct driver_data *driver_data = packet->driver_data;
 	int ret = -ENOENT;
 
-	tasklet_disable(&ctx->tasklet);
+	tasklet_disable_in_atomic(&ctx->tasklet);
 
 	if (packet->ack != 0)
 		goto out;
@@ -3465,7 +3465,7 @@ static int ohci_flush_iso_completions(st
 	struct iso_context *ctx = container_of(base, struct iso_context, base);
 	int ret = 0;
 
-	tasklet_disable(&ctx->context.tasklet);
+	tasklet_disable_in_atomic(&ctx->context.tasklet);
 
 	if (!test_and_set_bit_lock(0, &ctx->flushing_completions)) {
 		context_tasklet((unsigned long)&ctx->context);