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authorSven Van Asbroeck <thesven73@gmail.com>2020-11-09 15:38:28 -0500
committerJakub Kicinski <kuba@kernel.org>2020-11-10 17:52:54 -0800
commit2b52a4b65bc8f14520fe6e996ea7fb3f7e400761 (patch)
treeef8debe210f0685a3dee8af7902eb00ae3ea7818 /Documentation/COPYING-logo
parent2bae900b9419db3f3e43bbda3194657235fee096 (diff)
lan743x: fix "BUG: invalid wait context" when setting rx mode
In the net core, the struct net_device_ops -> ndo_set_rx_mode() callback is called with the dev->addr_list_lock spinlock held. However, this driver's ndo_set_rx_mode callback eventually calls lan743x_dp_write(), which acquires a mutex. Mutex acquisition may sleep, and this is not allowed when holding a spinlock. Fix by removing the dp_lock mutex entirely. Its purpose is to prevent concurrent accesses to the data port. No concurrent accesses are possible, because the dev->addr_list_lock spinlock in the core only lets through one thread at a time. Fixes: 23f0703c125b ("lan743x: Add main source files for new lan743x driver") Signed-off-by: Sven Van Asbroeck <thesven73@gmail.com> Link: https://lore.kernel.org/r/20201109203828.5115-1-TheSven73@gmail.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
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