treewide: Convert del_timer*() to timer_shutdown*()

Due to several bugs caused by timers being re-armed after they are
shutdown and just before they are freed, a new state of timers was added
called "shutdown".  After a timer is set to this state, then it can no
longer be re-armed.

The following script was run to find all the trivial locations where
del_timer() or del_timer_sync() is called in the same function that the
object holding the timer is freed.  It also ignores any locations where
the timer->function is modified between the del_timer*() and the free(),
as that is not considered a "trivial" case.

This was created by using a coccinelle script and the following
commands:

    $ cat timer.cocci
    @@
    expression ptr, slab;
    identifier timer, rfield;
    @@
    (
    -       del_timer(&ptr->timer);
    +       timer_shutdown(&ptr->timer);
    |
    -       del_timer_sync(&ptr->timer);
    +       timer_shutdown_sync(&ptr->timer);
    )
      ... when strict
          when != ptr->timer
    (
            kfree_rcu(ptr, rfield);
    |
            kmem_cache_free(slab, ptr);
    |
            kfree(ptr);
    )

    $ spatch timer.cocci . > /tmp/t.patch
    $ patch -p1 < /tmp/t.patch

Link: https://lore.kernel.org/lkml/20221123201306.823305113@linutronix.de/
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Acked-by: Pavel Machek <pavel@ucw.cz> [ LED ]
Acked-by: Kalle Valo <kvalo@kernel.org> [ wireless ]
Acked-by: Paolo Abeni <pabeni@redhat.com> [ networking ]
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 7 insertions, 7 deletions

diff --git a/drivers/pcmcia/bcm63xx_pcmcia.c b/drivers/pcmcia/bcm63xx_pcmcia.c
index bb06311d0b5f..dd3c26099048 100644
--- a/drivers/pcmcia/bcm63xx_pcmcia.c
+++ b/drivers/pcmcia/bcm63xx_pcmcia.c
@@ -443,7 +443,7 @@ static int bcm63xx_drv_pcmcia_remove(struct platform_device *pdev)
 	struct resource *res;
 
 	skt = platform_get_drvdata(pdev);
-	del_timer_sync(&skt->timer);
+	timer_shutdown_sync(&skt->timer);
 	iounmap(skt->base);
 	iounmap(skt->io_base);
 	res = skt->reg_res;
diff --git a/drivers/pcmcia/electra_cf.c b/drivers/pcmcia/electra_cf.c
index 40a5cffe24a4..efc27bc15152 100644
--- a/drivers/pcmcia/electra_cf.c
+++ b/drivers/pcmcia/electra_cf.c
@@ -317,7 +317,7 @@ static int electra_cf_remove(struct platform_device *ofdev)
 	cf->active = 0;
 	pcmcia_unregister_socket(&cf->socket);
 	free_irq(cf->irq, cf);
-	del_timer_sync(&cf->timer);
+	timer_shutdown_sync(&cf->timer);
 
 	iounmap(cf->io_virt);
 	iounmap(cf->mem_base);
diff --git a/drivers/pcmcia/omap_cf.c b/drivers/pcmcia/omap_cf.c
index d3f827d4224a..e613818dc0bc 100644
--- a/drivers/pcmcia/omap_cf.c
+++ b/drivers/pcmcia/omap_cf.c
@@ -296,7 +296,7 @@ static int __exit omap_cf_remove(struct platform_device *pdev)
 
 	cf->active = 0;
 	pcmcia_unregister_socket(&cf->socket);
-	del_timer_sync(&cf->timer);
+	timer_shutdown_sync(&cf->timer);
 	release_mem_region(cf->phys_cf, SZ_8K);
 	free_irq(cf->irq, cf);
 	kfree(cf);
diff --git a/drivers/pcmcia/pd6729.c b/drivers/pcmcia/pd6729.c
index f0af9985ca09..a0a2e7f18356 100644
--- a/drivers/pcmcia/pd6729.c
+++ b/drivers/pcmcia/pd6729.c
@@ -727,7 +727,7 @@ err_out_free_res2:
 	if (irq_mode == 1)
 		free_irq(dev->irq, socket);
 	else
-		del_timer_sync(&socket->poll_timer);
+		timer_shutdown_sync(&socket->poll_timer);
 err_out_free_res:
 	pci_release_regions(dev);
 err_out_disable:
@@ -754,7 +754,7 @@ static void pd6729_pci_remove(struct pci_dev *dev)
 	if (irq_mode == 1)
 		free_irq(dev->irq, socket);
 	else
-		del_timer_sync(&socket->poll_timer);
+		timer_shutdown_sync(&socket->poll_timer);
 	pci_release_regions(dev);
 	pci_disable_device(dev);
 
diff --git a/drivers/pcmcia/yenta_socket.c b/drivers/pcmcia/yenta_socket.c
index 3966a6ceb1ac..1365eaa20ff4 100644
--- a/drivers/pcmcia/yenta_socket.c
+++ b/drivers/pcmcia/yenta_socket.c
@@ -814,7 +814,7 @@ static void yenta_close(struct pci_dev *dev)
 	if (sock->cb_irq)
 		free_irq(sock->cb_irq, sock);
 	else
-		del_timer_sync(&sock->poll_timer);
+		timer_shutdown_sync(&sock->poll_timer);
 
 	iounmap(sock->base);
 	yenta_free_resources(sock);
@@ -1285,7 +1285,7 @@ static int yenta_probe(struct pci_dev *dev, const struct pci_device_id *id)
 	if (socket->cb_irq)
 		free_irq(socket->cb_irq, socket);
 	else
-		del_timer_sync(&socket->poll_timer);
+		timer_shutdown_sync(&socket->poll_timer);
  unmap:
 	iounmap(socket->base);
 	yenta_free_resources(socket);