[REGRESSION][BISECTED] 5.15-rc1: Broken AHCI on NVIDIA ION (MCP79)

[Rui Salvaterra]

Hi, Thomas,

I'm sorry for reporting this so late in the cycle, I wasn't expecting
being the only one affected. :)
"PCI/MSI: Use new mask/unmask functions" broke boot for my ION/Atom
330 system. Dmesg shows

failed to IDENTIFY (I/O error, err_mask=0x4)

and the system drops to an initramfs shell. Let me know if you need
any additional info (DMI dump and/or .config, for example).

Git bisect log follows:

git bisect start
# good: [7d2a07b769330c34b4deabeed939325c77a7ec2f] Linux 5.14
git bisect good 7d2a07b769330c34b4deabeed939325c77a7ec2f
# bad: [6880fa6c56601bb8ed59df6c30fd390cc5f6dd8f] Linux 5.15-rc1
git bisect bad 6880fa6c56601bb8ed59df6c30fd390cc5f6dd8f
# bad: [1b4f3dfb4792f03b139edf10124fcbeb44e608e6] Merge tag
'usb-serial-5.15-rc1' of
https://git.kernel.org/pub/scm/linux/kernel/git/johan/usb-serial into
usb-next
git bisect bad 1b4f3dfb4792f03b139edf10124fcbeb44e608e6
# good: [29ce8f9701072fc221d9c38ad952de1a9578f95c] Merge
git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net
git bisect good 29ce8f9701072fc221d9c38ad952de1a9578f95c
# bad: [e7c1bbcf0c315c56cd970642214aa1df3d8cf61d] Merge tag
'hwmon-for-v5.15' of
git://git.kernel.org/pub/scm/linux/kernel/git/groeck/linux-staging
git bisect bad e7c1bbcf0c315c56cd970642214aa1df3d8cf61d
# bad: [679369114e55f422dc593d0628cfde1d04ae59b3] Merge tag
'for-5.15/block-2021-08-30' of git://git.kernel.dk/linux-block
git bisect bad 679369114e55f422dc593d0628cfde1d04ae59b3
# good: [c7a5238ef68b98130fe36716bb3fa44502f56001] Merge tag
's390-5.15-1' of
git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux
git bisect good c7a5238ef68b98130fe36716bb3fa44502f56001
# good: [e5e726f7bb9f711102edea7e5bd511835640e3b4] Merge tag
'locking-core-2021-08-30' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
git bisect good e5e726f7bb9f711102edea7e5bd511835640e3b4
# good: [158ee7b65653d9f841823c249014c2d0dfdeeb8f] block: mark
blkdev_fsync static
git bisect good 158ee7b65653d9f841823c249014c2d0dfdeeb8f
# bad: [47fb0cfdb7a71a8a0ff8fe1d117363dc81f6ca77] Merge tag
'irqchip-5.15' of
git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms into
irq/core
git bisect bad 47fb0cfdb7a71a8a0ff8fe1d117363dc81f6ca77
# good: [4513fb87e1402ad815912ec7f027eb17149f44ee] Merge branch
irq/misc-5.15 into irq/irqchip-next
git bisect good 4513fb87e1402ad815912ec7f027eb17149f44ee
# bad: [88ffe2d0a55a165e55cedad1693f239d47e3e17e] genirq/cpuhotplug:
Demote debug printk to KERN_DEBUG
git bisect bad 88ffe2d0a55a165e55cedad1693f239d47e3e17e
# good: [fcacdfbef5a1633211ebfac1b669a7739f5b553e] PCI/MSI: Provide a
new set of mask and unmask functions
git bisect good fcacdfbef5a1633211ebfac1b669a7739f5b553e
# bad: [91cc470e797828d779cd4c1efbe8519bcb358bae] genirq: Change
force_irqthreads to a static key
git bisect bad 91cc470e797828d779cd4c1efbe8519bcb358bae
# bad: [428e211641ed808b55cdc7d880a0ee349eff354b] genirq/affinity:
Replace deprecated CPU-hotplug functions.
git bisect bad 428e211641ed808b55cdc7d880a0ee349eff354b
# bad: [446a98b19fd6da97a1fb148abb1766ad89c9b767] PCI/MSI: Use new
mask/unmask functions
git bisect bad 446a98b19fd6da97a1fb148abb1766ad89c9b767
# first bad commit: [446a98b19fd6da97a1fb148abb1766ad89c9b767]
PCI/MSI: Use new mask/unmask functions

Thanks in advance,
Rui