Florian Faber 584b8299f7 can: mscan: mscan_rx_poll(): fix rx path lockup when returning from polling to irq mode ... commit 2d77bd61a2 upstream. 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: afa17a500a ("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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2020-01-14 20:08:27 +01:00
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Kconfig	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
mpc5xxx_can.c	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 344	2019-06-05 17:37:07 +02:00
mscan.c	can: mscan: mscan_rx_poll(): fix rx path lockup when returning from polling to irq mode	2020-01-14 20:08:27 +01:00
mscan.h	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 344	2019-06-05 17:37:07 +02:00