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| author |   Thomas Gleixner <tglx@linutronix.de> | 2021-12-06 23:27:25 +0100 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2021-12-09 11:52:20 +0100 |
| commit | 4f1d038b5ea1b45d8265a5407712f975b600bb94 (patch) | |
| tree | 93c9fd920ddcc35bf9ec4565ff5f2c722fae690d /arch/powerpc/sysdev | |
| parent | Linux 5.16-rc4 (diff) | |
| download | linux-dev-4f1d038b5ea1b45d8265a5407712f975b600bb94.tar.xz linux-dev-4f1d038b5ea1b45d8265a5407712f975b600bb94.zip | |
powerpc/4xx: Remove MSI support which never worked
This code is broken since day one. ppc4xx_setup_msi_irqs() has the
following gems:
1) The handling of the result of msi_bitmap_alloc_hwirqs() is completely
broken:
When the result is greater than or equal 0 (bitmap allocation
successful) then the loop terminates and the function returns 0
(success) despite not having installed an interrupt.
When the result is less than 0 (bitmap allocation fails), it prints an
error message and continues to "work" with that error code which would
eventually end up in the MSI message data.
2) On every invocation the file global pp4xx_msi::msi_virqs bitmap is
allocated thereby leaking the previous one.
IOW, this has never worked and for more than 10 years nobody cared. Remove
the gunk.
Fixes: 3fb7933850fa ("powerpc/4xx: Adding PCIe MSI support")
Fixes: 247540b03bfc ("powerpc/44x: Fix PCI MSI support for Maui APM821xx SoC and Bluestone board")
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20211206210223.872249537@linutronix.de
Diffstat (limited to 'arch/powerpc/sysdev')
| -rw-r--r-- | arch/powerpc/sysdev/Kconfig | 6 |
1 files changed, 0 insertions, 6 deletions
diff --git a/arch/powerpc/sysdev/Kconfig b/arch/powerpc/sysdev/Kconfig index 9ebcc1337560..5aa92ff3622d 100644 --- a/arch/powerpc/sysdev/Kconfig +++ b/arch/powerpc/sysdev/Kconfig @@ -12,17 +12,11 @@ config PPC4xx_HSTA_MSI depends on PCI_MSI depends on PCI && 4xx -config PPC4xx_MSI - bool - depends on PCI_MSI - depends on PCI && 4xx - config PPC_MSI_BITMAP bool depends on PCI_MSI default y if MPIC default y if FSL_PCI - default y if PPC4xx_MSI default y if PPC_POWERNV source "arch/powerpc/sysdev/xics/Kconfig" |