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| author | Ilpo Järvinen <[email protected]> | 2022-05-20 13:35:41 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2022-06-10 13:52:19 +0200 |
| commit | be03b0651ffd8bab69dfd574c6818b446c0753ce (patch) | |
| tree | bdaadd1edcd368b711177436eb31bf06ef6c89c4 /scripts/bpf_doc.py | |
| parent | 499e13aac6c762e1e828172b0f0f5275651d6512 (diff) | |
serial: 8250: Store to lsr_save_flags after lsr read
Not all LSR register flags are preserved across reads. Therefore, LSR
readers must store the non-preserved bits into lsr_save_flags.
This fix was initially mixed into feature commit f6f586102add ("serial:
8250: Handle UART without interrupt on TEMT using em485"). However,
that feature change had a flaw and it was reverted to make room for
simpler approach providing the same feature. The embedded fix got
reverted with the feature change.
Re-add the lsr_save_flags fix and properly mark it's a fix.
Link: https://lore.kernel.org/all/[email protected]/T/#m1737eef986bd20cf19593e344cebd7b0244945fc
Fixes: e490c9144cfa ("tty: Add software emulated RS485 support for 8250")
Cc: stable <[email protected]>
Acked-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Ilpo Järvinen <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'scripts/bpf_doc.py')
0 files changed, 0 insertions, 0 deletions