Chengfeng Ye 56c6be35fc mISDN: hfcpci: Fix potential deadlock on &hc->lock ... As &hc->lock is acquired by both timer _hfcpci_softirq() and hardirq hfcpci_int(), the timer should disable irq before lock acquisition otherwise deadlock could happen if the timmer is preemtped by the hadr irq. Possible deadlock scenario: hfcpci_softirq() (timer) -> _hfcpci_softirq() -> spin_lock(&hc->lock); <irq interruption> -> hfcpci_int() -> spin_lock(&hc->lock); (deadlock here) This flaw was found by an experimental static analysis tool I am developing for irq-related deadlock. The tentative patch fixes the potential deadlock by spin_lock_irq() in timer. Fixes: b36b654a7e ("mISDN: Create /sys/class/mISDN") Signed-off-by: Chengfeng Ye <dg573847474@gmail.com> Link: https://lore.kernel.org/r/20230727085619.7419-1-dg573847474@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>		2023-07-28 18:49:28 -07:00
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mISDN	mISDN: hfcpci: Fix potential deadlock on &hc->lock	2023-07-28 18:49:28 -07:00
Makefile	isdn: move capi drivers to staging	2019-05-31 11:17:41 +02:00