can: mscan: mscan_rx_poll(): fix rx path lockup when returning from polling to irq mode
Under load, the RX side of the mscan driver can get stuck while TX still works. Restarting the interface locks up the system. This behaviour could be reproduced reliably on a MPC5121e based system. The patch fixes the return value of the NAPI polling function (should be the number of processed packets, not constant 1) and the condition under which IRQs are enabled again after polling is finished. With this patch, no more lockups were observed over a test period of ten days. Fixes: afa17a50 ("net/can: add driver for mscan family & mpc52xx_mscan") Signed-off-by:Florian Faber <faber@faberman.de> Cc: linux-stable <stable@vger.kernel.org> Signed-off-by:
Marc Kleine-Budde <mkl@pengutronix.de>
parent
2f361cd9
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