[PATCH] mtd: rawnand: r852: prevent card work from being requeued during shutdown

[James Hilliard]

The card interrupt can queue card_detect_work after shutdown cancels it
but before interrupts are disabled. The worker can then access the
controller after pci_disable_device(), and can enable card interrupts
again while processing the event.

Disable and drain the delayed work before turning off interrupts and the
PCI device. Later queue attempts are rejected while the IRQ handler can
still acknowledge events until interrupt teardown completes.

Fixes: 67e054e91924 ("mtd: nand: Add driver for Ricoh xD/SmartMedia reader")
Cc: stable at vger.kernel.org
Signed-off-by: James Hilliard <james.hilliard1 at gmail.com>
---
 drivers/mtd/nand/raw/r852.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/mtd/nand/raw/r852.c b/drivers/mtd/nand/raw/r852.c
index 92c47d351c27..bf1c1be7f2aa 100644
--- a/drivers/mtd/nand/raw/r852.c
+++ b/drivers/mtd/nand/raw/r852.c
@@ -1007,7 +1007,7 @@ static void r852_shutdown(struct pci_dev *pci_dev)
 {
 	struct r852_device *dev = pci_get_drvdata(pci_dev);
 
-	cancel_delayed_work_sync(&dev->card_detect_work);
+	disable_delayed_work_sync(&dev->card_detect_work);
 	r852_disable_irqs(dev);
 	synchronize_irq(dev->irq);
 	pci_disable_device(pci_dev);

---
base-commit: 30daaf3e7897b4a8d9b72e5b0c86dd6e2a4d7d85
change-id: 20261107-submit-r852-shutdown-work-v1-15fe04537064

Best regards,
--  
James Hilliard <james.hilliard1 at gmail.com>