diff options
| author | Martin Sperl <kernel@martin.sperl.org> | 2015-05-10 07:50:45 +0000 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2015-05-11 19:05:27 +0100 |
| commit | 8e76ef88f607174082023f50b87fe12dcdbe5db5 (patch) | |
| tree | 080e56d5f05011b769a1b64db8ac0a5d76c6eea1 /drivers/spi | |
| parent | f8bb820da4ae863c676156627973a950129559fb (diff) | |
| download | linux-8e76ef88f607174082023f50b87fe12dcdbe5db5.tar.gz | |
spi: fix race freeing dummy_tx/rx before it is unmapped
Fix a race (with some kernel configurations) where a queued master->pump_messages runs and frees dummy_tx/rx before spi_unmap_msg is running (or is finished). This results in the following messages: BUG: Bad page state in process page:db7ba030 count:0 mapcount:0 mapping: (null) index:0x0 flags: 0x200(arch_1) page dumped because: PAGE_FLAGS_CHECK_AT_PREP flag set ... Reported-by: Noralf Trønnes <noralf@tronnes.org> Suggested-by: Noralf Trønnes <noralf@tronnes.org> Tested-by: Noralf Trønnes <noralf@tronnes.org> Signed-off-by: Martin Sperl <kernel@martin.sperl.org> Signed-off-by: Mark Brown <broonie@kernel.org> Cc: stable@vger.kernel.org
Diffstat (limited to 'drivers/spi')
| -rw-r--r-- | drivers/spi/spi.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 50910d85df5a..d35c1a13217c 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -988,9 +988,6 @@ void spi_finalize_current_message(struct spi_master *master) spin_lock_irqsave(&master->queue_lock, flags); mesg = master->cur_msg; - master->cur_msg = NULL; - - queue_kthread_work(&master->kworker, &master->pump_messages); spin_unlock_irqrestore(&master->queue_lock, flags); spi_unmap_msg(master, mesg); @@ -1003,9 +1000,13 @@ void spi_finalize_current_message(struct spi_master *master) } } - trace_spi_message_done(mesg); - + spin_lock_irqsave(&master->queue_lock, flags); + master->cur_msg = NULL; master->cur_msg_prepared = false; + queue_kthread_work(&master->kworker, &master->pump_messages); + spin_unlock_irqrestore(&master->queue_lock, flags); + + trace_spi_message_done(mesg); mesg->state = NULL; if (mesg->complete) |