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| author | Alex Williamson <alex.williamson@redhat.com> | 2024-03-09 02:05:22 +0300 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2024-03-11 22:08:30 +0300 |
| commit | fe9a7082684eb059b925c535682e68c34d487d43 (patch) | |
| tree | 56192e4a025083e78d277507d61726b9ca685902 /drivers/auxdisplay/cfag12864b.c | |
| parent | 6a7e448c6b238c9b256b01eb198b0af93ae3157e (diff) | |
| download | linux-fe9a7082684eb059b925c535682e68c34d487d43.tar.xz | |
vfio/pci: Disable auto-enable of exclusive INTx IRQ
Currently for devices requiring masking at the irqchip for INTx, ie.
devices without DisINTx support, the IRQ is enabled in request_irq()
and subsequently disabled as necessary to align with the masked status
flag. This presents a window where the interrupt could fire between
these events, resulting in the IRQ incrementing the disable depth twice.
This would be unrecoverable for a user since the masked flag prevents
nested enables through vfio.
Instead, invert the logic using IRQF_NO_AUTOEN such that exclusive INTx
is never auto-enabled, then unmask as required.
Cc: <stable@vger.kernel.org>
Fixes: 89e1f7d4c66d ("vfio: Add PCI device driver")
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20240308230557.805580-2-alex.williamson@redhat.com
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Diffstat (limited to 'drivers/auxdisplay/cfag12864b.c')
0 files changed, 0 insertions, 0 deletions