diff options
| author | Frederic Barrat <fbarrat@linux.ibm.com> | 2020-01-13 14:01:18 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-01-22 20:31:41 +1100 |
| commit | 17328f218fb760c9c6accc5b52494889243a6b98 (patch) | |
| tree | 0238a7c29d2976a4c25e26dc2a4dfd908ba0a062 /arch/powerpc/include | |
| parent | a2db55dda9cf9c24427ccd5da8792b028ebff46c (diff) | |
powerpc/xive: Discard ESB load value when interrupt is invalid
A load on an ESB page returning all 1's means that the underlying
device has invalidated the access to the PQ state of the interrupt
through mmio. It may happen, for example when querying a PHB interrupt
while the PHB is in an error state.
In that case, we should consider the interrupt to be invalid when
checking its state in the irq_get_irqchip_state() handler.
Fixes: da15c03b047d ("powerpc/xive: Implement get_irqchip_state method for XIVE to fix shutdown race")
Cc: stable@vger.kernel.org # v5.4+
Signed-off-by: Frederic Barrat <fbarrat@linux.ibm.com>
[clg: wrote a commit log, introduced XIVE_ESB_INVALID ]
Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200113130118.27969-1-clg@kaod.org
Diffstat (limited to 'arch/powerpc/include')
| -rw-r--r-- | arch/powerpc/include/asm/xive-regs.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/xive-regs.h b/arch/powerpc/include/asm/xive-regs.h index f2dfcd50a2d3..33aee7490cbb 100644 --- a/arch/powerpc/include/asm/xive-regs.h +++ b/arch/powerpc/include/asm/xive-regs.h @@ -39,6 +39,7 @@ #define XIVE_ESB_VAL_P 0x2 #define XIVE_ESB_VAL_Q 0x1 +#define XIVE_ESB_INVALID 0xFF /* * Thread Management (aka "TM") registers |