diff options
| author | Jun Chen <jun.d.chen@intel.com> | 2012-10-22 10:23:07 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2012-10-25 11:29:58 -0700 |
| commit | c73ba2ae43fd4d69589caeecc5260a41be87b759 (patch) | |
| tree | 1cb25c6cf3d0eb3010e8e24c1e1531ad4569431e /drivers | |
| parent | 319fb0d21907f771d8ccdb6177fb2fcafabc6ab4 (diff) | |
serial: ifx6x60: add_timer is not safe in the mrdy_assert function
This patch make use of mod_timer instead of add_timer in the mrdy_assert function.
Because the srdy interrupter can go high when we are running function mrdy_assert and mrdy_assert
can be called by multi-entry. In our medfield platform, spi stress test can encounter this
error logs triggered by the BUG_ON of add_timer function.This patch had been tested on
our medfield platform.
the scenario:
CPU0 CPU1
mrdy_assert
set_bit(IFX_SPI_STATE_TIMER_PENDING)
ifx_spi_handle_srdy
...
clear_bit(IFX_SPI_STATE_TIMER_PENDING)
...
mrdy_assert
set_bit(IFX_SPI_STATE_TIMER_PENDING)
...
add_timer
...
add_timer
Cc: liu chuansheng <chuansheng.liu@intel.com>
Cc: Bi Chao <chao.bi@intel.com>
Signed-off-by: Chen Jun <jun.d.chen@intel.com>
Acked-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/ifx6x60.c | 4 |
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/tty/serial/ifx6x60.c b/drivers/tty/serial/ifx6x60.c index 2d2bcbd80670..4b001ea4b0b8 100644 --- a/drivers/tty/serial/ifx6x60.c +++ b/drivers/tty/serial/ifx6x60.c @@ -231,9 +231,7 @@ static void mrdy_assert(struct ifx_spi_device *ifx_dev) if (!val) { if (!test_and_set_bit(IFX_SPI_STATE_TIMER_PENDING, &ifx_dev->flags)) { - ifx_dev->spi_timer.expires = - jiffies + IFX_SPI_TIMEOUT_SEC*HZ; - add_timer(&ifx_dev->spi_timer); + mod_timer(&ifx_dev->spi_timer,jiffies + IFX_SPI_TIMEOUT_SEC*HZ); } } |