irqchip/gic-v3-its: Don't clamp nvecs to zero when id_bits is 32

GITS_TYPER_IDBITS is five bits, so id_bits reaches 32 and
min_t(unsigned int, ...) truncates BIT(32) to 0. nvecs becomes 0,
its_lpi_alloc() rejects that, and its_msi_prepare() returns -ENOMEM.
On 32-bit ARM the shift is undefined instead.

The clamp is correct for every value below the maximum, so only that
one value is affected.

Fixes: ce9e40a9a5e5c ("irqchip/gic-v3-its: Limit number of per-device MSIs to the range the ITS supports")
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu (Huawei) <zenghui.yu@linux.dev>
Reviewed-by: Radu Rendec <radu@rendec.net>
Cc: stable@vger.kernel.org
Link: https://patch.msgid.link/20260908142632.2795308-3-fuad.tabba@linux.dev

0 files changed, 0 insertions, 0 deletions