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| author | Ruihong Luo <colorsu1922@gmail.com> | 2023-07-13 08:42:36 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-25 20:31:31 +0200 |
| commit | 748c5ea8b8796ae8ee80b8d3a3d940570b588d59 (patch) | |
| tree | dd8e0bc02ece832eaa42206d09ec0a8128516bfc /kernel/trace/ring_buffer.c | |
| parent | 57c984f6fe20ebb9306d6e8c09b4f67fe63298c6 (diff) | |
| download | lwn-748c5ea8b8796ae8ee80b8d3a3d940570b588d59.tar.gz lwn-748c5ea8b8796ae8ee80b8d3a3d940570b588d59.zip | |
serial: 8250_dw: Preserve original value of DLF register
Preserve the original value of the Divisor Latch Fraction (DLF) register.
When the DLF register is modified without preservation, it can disrupt
the baudrate settings established by firmware or bootloader, leading to
data corruption and the generation of unreadable or distorted characters.
Fixes: 701c5e73b296 ("serial: 8250_dw: add fractional divisor support")
Cc: stable <stable@kernel.org>
Signed-off-by: Ruihong Luo <colorsu1922@gmail.com>
Link: https://lore.kernel.org/stable/20230713004235.35904-1-colorsu1922%40gmail.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230713004235.35904-1-colorsu1922@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/trace/ring_buffer.c')
0 files changed, 0 insertions, 0 deletions