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author | Russell King (Oracle) <rmk+kernel@armlinux.org.uk> | 2023-01-27 10:40:11 +0000 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-02-09 11:28:25 +0100 |
commit | 897dfd346223fed415d7d7e6644982166a60e727 (patch) | |
tree | d410691772bc57ad4319f8c97229562bad369f71 /fs/signalfd.c | |
parent | 39708bc8da7858de0bed9b3a88b3beb1d1e0b443 (diff) | |
download | linux-897dfd346223fed415d7d7e6644982166a60e727.tar.gz |
nvmem: core: fix registration vs use race
commit ab3428cfd9aa2f3463ee4b2909b5bb2193bd0c4a upstream. The i.MX6 CPU frequency driver sometimes fails to register at boot time due to nvmem_cell_read_u32() sporadically returning -ENOENT. This happens because there is a window where __nvmem_device_get() in of_nvmem_cell_get() is able to return the nvmem device, but as cells have been setup, nvmem_find_cell_entry_by_node() returns NULL. The occurs because the nvmem core registration code violates one of the fundamental principles of kernel programming: do not publish data structures before their setup is complete. Fix this by making nvmem core code conform with this principle. Fixes: eace75cfdcf7 ("nvmem: Add a simple NVMEM framework for nvmem providers") Cc: stable@vger.kernel.org Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk> Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org> Link: https://lore.kernel.org/r/20230127104015.23839-7-srinivas.kandagatla@linaro.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/signalfd.c')
0 files changed, 0 insertions, 0 deletions