can: kvaser_pciefd: Force IRQ edge in case of nested IRQ

Avoid the driver missing IRQs by temporarily masking IRQs in the ISR
to enforce an edge even if a different IRQ is signalled before handled
IRQs are cleared.

Fixes: 48f827d4 ("can: kvaser_pciefd: Move reset of DMA RX buffers to the end of the ISR")
Cc: stable@vger.kernel.org
Signed-off-by: Axel Forsman <axfo@kvaser.com>
Tested-by: Jimmy Assarsson <extja@kvaser.com>
Reviewed-by: Jimmy Assarsson <extja@kvaser.com>
Link: https://patch.msgid.link/20250520114332.8961-2-axfo@kvaser.com


Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>