Hi,
On 2/24/2022 3:42 PM, Marc Zyngier wrote:
pdc_enable_intr() serves as a primitive to qcom_pdc_gic_{en,dis}able,
and has a raw spinlock for mutual exclusion, which is uses with
interruptible primitives.
This means that this critical section can itself be interrupted.
Should the interrupt also be a PDC interrupt, and the endpoint driver
perform an irq_disable() on that interrupt, we end-up in a deadlock.
Fix this by using the irqsave/irqrestore variants of the locking
primitives.
Signed-off-by: Marc Zyngier <maz@xxxxxxxxxx>
Reviewed-by: Maulik Shah <quic_mkshah@xxxxxxxxxxx>
Thanks,
Maulik
---
drivers/irqchip/qcom-pdc.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
