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| author | Jia-Ju Bai <baijiaju1990@gmail.com> | 2017-12-12 21:24:56 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-12-15 20:24:14 +0100 |
| commit | fe8e7acea2426dcd1130fd5c9710b74217c90dd0 (patch) | |
| tree | 865a507d64c1ba033fe1d994bd1ee0552d77cb92 /arch/m68k/mvme16x | |
| parent | be7e251d20e6c800b3b9ee79d1da6059438c34f8 (diff) | |
tty/isicom: Fix a possible sleep-in-atomic bug in WaitTillCardIsFree
The driver may sleep under a spinlock.
The function call paths are:
isicom_activate (acquire the spinlock)
isicom_setup_board
drop_dtr_rts
WaitTillCardIsFree
msleep --> may sleep
isicom_set_termios
isicom_config_port
drop_dtr
WaitTillCardIsFree
msleep --> may sleep
isicom_tiocmset
drop_dtr
WaitTillCardIsFree
msleep --> may sleep
Though "in_atomic" is used to check atomic context,
but it is not recommended to use in driver code (see include/linux/preempt.h).
To fix it, only using mdelay instead.
This bug is found by my static analysis tool(DSAC) and checked by my code review.
Signed-off-by: Jia-Ju Bai <baijiaju1990@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/m68k/mvme16x')
0 files changed, 0 insertions, 0 deletions