diff options
| author | Lee Jones <lee.jones@linaro.org> | 2014-08-28 15:14:08 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-09-24 08:14:28 +0200 |
| commit | e4ebe5fe2d507a4c228bf90dea7dd4de57cbce92 (patch) | |
| tree | 60a8202982629355778e58a8fa97b684a131b6c1 /drivers/misc/ti-st | |
| parent | parport: parport_pc: Implement architecture and device check to cut off false... (diff) | |
| download | linux-e4ebe5fe2d507a4c228bf90dea7dd4de57cbce92.tar.xz linux-e4ebe5fe2d507a4c228bf90dea7dd4de57cbce92.zip | |
misc: st_core: Protect unsigned value against becoming negative
Coverity reported:
This less-than-zero comparison of an unsigned value is never true.
In answer to that, we only ever decrement if protos_registered is
positive. We can subsequently remove the paranoid checking during
unregister.
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/ti-st')
| -rw-r--r-- | drivers/misc/ti-st/st_core.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c index 1972d57aadb3..54be83d3efdd 100644 --- a/drivers/misc/ti-st/st_core.c +++ b/drivers/misc/ti-st/st_core.c @@ -153,8 +153,9 @@ static void st_reg_complete(struct st_data_s *st_gdata, char err) (st_gdata->list[i]->priv_data, err); pr_info("protocol %d's cb sent %d\n", i, err); if (err) { /* cleanup registered protocol */ - st_gdata->protos_registered--; st_gdata->is_registered[i] = false; + if (st_gdata->protos_registered) + st_gdata->protos_registered--; } } } @@ -639,14 +640,12 @@ long st_unregister(struct st_proto_s *proto) return -EPROTONOSUPPORT; } - st_gdata->protos_registered--; + if (st_gdata->protos_registered) + st_gdata->protos_registered--; + remove_channel_from_table(st_gdata, proto); spin_unlock_irqrestore(&st_gdata->lock, flags); - /* paranoid check */ - if (st_gdata->protos_registered < ST_EMPTY) - st_gdata->protos_registered = ST_EMPTY; - if ((st_gdata->protos_registered == ST_EMPTY) && (!test_bit(ST_REG_PENDING, &st_gdata->st_state))) { pr_info(" all chnl_ids unregistered "); |