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| author |   Rabin Vincent <rabin.vincent@stericsson.com> | 2012-01-17 11:52:28 +0100 |
|---|---|---|
| committer |   Greg Kroah-Hartman <gregkh@suse.de> | 2012-01-24 16:09:55 -0800 |
| commit | ef605fdb33883d687cff5ba75095a91b313b4966 (patch) | |
| tree | 7eea2b5b397d0b5373ec76035bf924d3885b2489 /tools/perf/scripts/python | |
| parent | amba-pl011: do not disable RTS during shutdown (diff) | |
| download | linux-dev-ef605fdb33883d687cff5ba75095a91b313b4966.tar.xz linux-dev-ef605fdb33883d687cff5ba75095a91b313b4966.zip | |
serial: amba-pl011: lock console writes against interrupts
Protect against pl011_console_write() and the interrupt for
the console UART running concurrently on different CPUs.
Otherwise the console_write could spin for a long time
waiting for the UART to become not busy, while the other
CPU continuously services UART interrupts and keeps the
UART busy.
The checks for sysrq and oops_in_progress are taken
from 8250.c.
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com>
Reviewed-by: Srinidhi Kasagar <srinidhi.kasagar@stericsson.com>
Reviewed-by: Bibek Basu <bibek.basu@stericsson.com>
Reviewed-by: Shreshtha Kumar Sahu <shreshthakumar.sahu@stericsson.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'tools/perf/scripts/python')
0 files changed, 0 insertions, 0 deletions