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f1d761f95e
edma_read_append_stats() gets called from two places in the driver. The first place is the kernel timer that periodically updates the statistics, so nothing gets lost due to overflows. The second one it's part of the userspace ethtool ioctl handler to provide up-to-date values. For this configuration, the use of spin_lock() is not sufficient and as per: <https://mirrors.edge.kernel.org/pub/linux/kernel/people/rusty/kernel-locking/c214.html> the locking has to be upgraded to spin_lock_bh(). Signed-off-by: Masafumi UTSUGI <mutsugi@allied-telesis.co.jp> [folded patch into 710-, rewrote message] Signed-off-by: Christian Lamparter <chunkeey@gmail.com>