soc: fsl: dpio: Free the IRQ before releasing the I/O object

The DPIO interrupt handler accesses priv->io, but dpaa2_dpio_remove()
releases that object before tearing down the interrupts. The IRQ was
requested with devm_request_irq(), and unregister_dpio_irq_handlers()
only clears its affinity hint. fsl_mc_free_irqs() returns IRQ resources
to the MC resource pool without freeing the handler. An interrupt can
therefore access the freed I/O object before devres releases the IRQ.

Explicitly free the managed IRQ in unregister_dpio_irq_handlers() before
returning its resource to the pool, and perform IRQ teardown before
releasing the I/O object. This also waits for an in-flight handler while
the object is still valid.

This issue was identified during our ongoing static-analysis research
while reviewing kernel code.

Fixes: 993fec7e11ca ("bus: fsl-mc: dpio: add the DPAA2 DPIO object driver")
Cc: stable@vger.kernel.org
Assisted-by: LLM
Co-developed-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Ijae Kim <ae878000@gmail.com>
Signed-off-by: Myeonghun Pak <mhun512@gmail.com>
Reviewed-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20261002194802.375497-3-mhun512@gmail.com
Signed-off-by: Christophe Leroy (CS GROUP) <chleroy@kernel.org>

0 files changed, 0 insertions, 0 deletions