drm/msm: don't free the IRQ if it was not requested

In the Linux kernel, the following vulnerability has been resolved:

drm/msm: don't free the IRQ if it was not requested

As msm_drm_uninit() is called from the msm_drm_init() error path,

additional care should be necessary as not to call the free_irq() for

the IRQ that was not requested before (because an error occured earlier

than the request_irq() call).

This fixed the issue reported with the following backtrace:

[ 8.571329] Trying to free already-free IRQ 187

[ 8.571339] WARNING: CPU: 0 PID: 76 at kernel/irq/manage.c:1895 free_irq+0x1e0/0x35c

[ 8.588746] Modules linked in: pmic_glink pdr_interface fastrpc qrtr_smd snd_soc_hdmi_codec msm fsa4480 gpu_sched drm_dp_aux_bus qrtr i2c_qcom_geni crct10dif_ce qcom_stats qcom_q6v5_pas drm_display_helper gpi qcom_pil_info drm_kms_helper qcom_q6v5 qcom_sysmon qcom_common qcom_glink_smem qcom_rng mdt_loader qmi_helpers phy_qcom_qmp ufs_qcom typec qnoc_sm8350 socinfo rmtfs_mem fuse drm ipv6

[ 8.624154] CPU: 0 PID: 76 Comm: kworker/u16:2 Not tainted 5.18.0-rc5-next-20220506-00033-g6cee8cab6089-dirty #419

[ 8.624161] Hardware name: Qualcomm Technologies, Inc. SM8350 HDK (DT)

[ 8.641496] Workqueue: events_unbound deferred_probe_work_func

[ 8.647510] pstate: 604000c5 (nZCv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--)

[ 8.654681] pc : free_irq+0x1e0/0x35c

[ 8.658454] lr : free_irq+0x1e0/0x35c

[ 8.662228] sp : ffff800008ab3950

[ 8.665642] x29: ffff800008ab3950 x28: 0000000000000000 x27: ffff16350f56a700

[ 8.672994] x26: ffff1635025df080 x25: ffff16350251badc x24: ffff16350251bb90

[ 8.680343] x23: 0000000000000000 x22: 00000000000000bb x21: ffff16350e8f9800

[ 8.687690] x20: ffff16350251ba00 x19: ffff16350cbd5880 x18: ffffffffffffffff

[ 8.695039] x17: 0000000000000000 x16: ffffa2dd12179434 x15: ffffa2dd1431d02d

[ 8.702391] x14: 0000000000000000 x13: ffffa2dd1431d028 x12: 662d79646165726c

[ 8.709740] x11: ffffa2dd13fd2438 x10: 000000000000000a x9 : 00000000000000bb

[ 8.717111] x8 : ffffa2dd13fd23f0 x7 : ffff800008ab3750 x6 : 00000000fffff202

[ 8.724487] x5 : ffff16377e870a18 x4 : 00000000fffff202 x3 : ffff735a6ae1b000

[ 8.731851] x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff1635015f8000

[ 8.739217] Call trace:

[ 8.741755] free_irq+0x1e0/0x35c

[ 8.745198] msm_drm_uninit.isra.0+0x14c/0x294 [msm]

[ 8.750548] msm_drm_bind+0x28c/0x5d0 [msm]

[ 8.755081] try_to_bring_up_aggregate_device+0x164/0x1d0

[ 8.760657] __component_add+0xa0/0x170

[ 8.764626] component_add+0x14/0x20

[ 8.768337] dp_display_probe+0x2a4/0x464 [msm]

[ 8.773242] platform_probe+0x68/0xe0

[ 8.777043] really_probe.part.0+0x9c/0x28c

[ 8.781368] __driver_probe_device+0x98/0x144

[ 8.785871] driver_probe_device+0x40/0x140

[ 8.790191] __device_attach_driver+0xb4/0x120

[ 8.794788] bus_for_each_drv+0x78/0xd0

[ 8.798751] __device_attach+0xdc/0x184

[ 8.802713] device_initial_probe+0x14/0x20

[ 8.807031] bus_probe_device+0x9c/0xa4

[ 8.810991] deferred_probe_work_func+0x88/0xc0

[ 8.815667] process_one_work+0x1d0/0x320

[ 8.819809] worker_thread+0x14c/0x444

[ 8.823688] kthread+0x10c/0x110

[ 8.827036] ret_from_fork+0x10/0x20

Patchwork: https://patchwork.freedesktop.org/patch/485422/