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| author | Marek Roszko <[email protected]> | 2014-01-10 09:33:11 +0000 |
|---|---|---|
| committer | Greg Kroah-Hartman <[email protected]> | 2014-01-13 23:55:59 +0000 |
| commit | 8bc661bfc0c2d221e209f4205bdaaf574d50100c (patch) | |
| tree | 2fbd2b8a47104ebc014476530806b1afbbe2f2f5 /lib/genalloc.c | |
| parent | serial: 8250: enable UART_BUG_NOMSR for Tegra (diff) | |
| download | kernel-8bc661bfc0c2d221e209f4205bdaaf574d50100c.tar.gz kernel-8bc661bfc0c2d221e209f4205bdaaf574d50100c.zip | |
tty/serial: at91: disable uart timer at start of shutdown
The uart timer will schedule a tasklet when it fires. It is possible that it
can fire inside _shutdown before it is killed in the dma and pdc cleanup
routines. This causes a tasklet that exists after the port is shutdown, so when
the kernel finally executes it, it panics as the tty port is NULL.
This is a somewhat rare condition but its possible if a program keeps on
opening/closing the port. It has been observed in particular with systemd
boot messages that were causing a kernel panic because of this behavior.
Moving the timer deletion to the beginning of the function stops a tasklet from
being scheduled unexpectedly.
Signed-off-by: Marek Roszko <[email protected]>
Cc: stable <[email protected]> # v3.12
[[email protected]: modify commit message, call setup_timer() in any case]
Signed-off-by: Nicolas Ferre <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Diffstat (limited to 'lib/genalloc.c')
0 files changed, 0 insertions, 0 deletions