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authorThomas Gleixner2020-07-29 10:53:28 +0200
committerIngo Molnar2020-07-29 16:27:16 +0200
commitbdd65589593edd79b6a12ce86b3b7a7c6dae5208 (patch)
treefa9b59260020434dace3e71beda74a527c6de7b8 /Makefile
parent92ed301919932f777713b9172e525674157e983d (diff)
x86/i8259: Use printk_deferred() to prevent deadlock
0day reported a possible circular locking dependency: Chain exists of: &irq_desc_lock_class --> console_owner --> &port_lock_key Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&port_lock_key); lock(console_owner); lock(&port_lock_key); lock(&irq_desc_lock_class); The reason for this is a printk() in the i8259 interrupt chip driver which is invoked with the irq descriptor lock held, which reverses the lock operations vs. printk() from arbitrary contexts. Switch the printk() to printk_deferred() to avoid that. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@kernel.org> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/87365abt2v.fsf@nanos.tec.linutronix.de
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