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| author | Pali Rohár <pali@kernel.org> | 2021-09-27 11:37:04 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-10-05 15:02:58 +0200 |
| commit | 32262e2e429cdb31f9e957e997d53458762931b7 (patch) | |
| tree | 70a666e9895aba562b6910e876383e2feb29391d /kernel/ptrace.c | |
| parent | 027b57170bf8bb6999a28e4a5f3d78bf1db0f90c (diff) | |
| download | linux-32262e2e429cdb31f9e957e997d53458762931b7.tar.gz linux-32262e2e429cdb31f9e957e997d53458762931b7.tar.bz2 linux-32262e2e429cdb31f9e957e997d53458762931b7.zip | |
serial: 8250: Fix reporting real baudrate value in c_ospeed field
In most cases it is not possible to set exact baudrate value to hardware.
So fix reporting real baudrate value which was set to hardware via c_ospeed
termios field. It can be retrieved by ioctl(TCGETS2) from userspace.
Real baudrate value is calculated from chosen hardware divisor and base
clock. It is implemented in a new function serial8250_compute_baud_rate()
which is inverse of serial8250_get_divisor() function.
With this change is fixed also UART timeout value (it is updated via
uart_update_timeout() function), which is calculated from the now fixed
baudrate value too.
Cc: stable@vger.kernel.org
Signed-off-by: Pali Rohár <pali@kernel.org>
Link: https://lore.kernel.org/r/20210927093704.19768-1-pali@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel/ptrace.c')
0 files changed, 0 insertions, 0 deletions