diff options
| author | Pavan Savoy <pavan_savoy@ti.com> | 2011-11-30 09:51:55 -0600 |
|---|---|---|
| committer | Dan Murphy <dmurphy@ti.com> | 2011-12-17 06:05:08 -0600 |
| commit | 1e6797450e78ebae9b90c8f47ab3fbd21c155e52 (patch) | |
| tree | a6381140e3a45a35b42dba56d0cbeb61673dde7a /drivers/misc/ti-st | |
| parent | 99ed664041204b0aa57f317ba4ff2e71d9c5567b (diff) | |
| download | kernel_samsung_espresso10-1e6797450e78ebae9b90c8f47ab3fbd21c155e52.tar.gz kernel_samsung_espresso10-1e6797450e78ebae9b90c8f47ab3fbd21c155e52.tar.bz2 kernel_samsung_espresso10-1e6797450e78ebae9b90c8f47ab3fbd21c155e52.zip | |
drivers:misc: ti-st: protect registrations
Concurrent access to UART2/combo-interface by multiple protocol drivers such
as BT, FM and GPS caused issues during firmware download failure cases or
cases when the firmware download took longer than usual.
This was because of un-safe access to protos_registered & st_states.
Protecting this will also make the registration complete callback un-safe for
sleep.
Change-Id: I1163587ee4ee7561ca591a874f5c403f7da84e58
Signed-off-by: Pavan Savoy <pavan_savoy@ti.com>
Diffstat (limited to 'drivers/misc/ti-st')
| -rw-r--r-- | drivers/misc/ti-st/st_core.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/misc/ti-st/st_core.c b/drivers/misc/ti-st/st_core.c index c0359021029..5a92118e00b 100644 --- a/drivers/misc/ti-st/st_core.c +++ b/drivers/misc/ti-st/st_core.c @@ -137,6 +137,8 @@ void st_send_frame(unsigned char chnl_id, struct st_data_s *st_gdata) * st_reg_complete - * to call registration complete callbacks * of all protocol stack drivers + * This function is being called with spin lock held, protocol drivers are + * only expected to complete their waits and do nothing more than that. */ void st_reg_complete(struct st_data_s *st_gdata, char err) { @@ -554,11 +556,12 @@ long st_register(struct st_proto_s *new_proto) set_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state); st_recv = st_kim_recv; + /* enable the ST LL - to set default chip state */ + st_ll_enable(st_gdata); + /* release lock previously held - re-locked below */ spin_unlock_irqrestore(&st_gdata->lock, flags); - /* enable the ST LL - to set default chip state */ - st_ll_enable(st_gdata); /* this may take a while to complete * since it involves BT fw download */ @@ -569,10 +572,13 @@ long st_register(struct st_proto_s *new_proto) (test_bit(ST_REG_PENDING, &st_gdata->st_state))) { pr_err(" KIM failure complete callback "); st_reg_complete(st_gdata, err); + clear_bit(ST_REG_PENDING, &st_gdata->st_state); } return -EINVAL; } + spin_lock_irqsave(&st_gdata->lock, flags); + clear_bit(ST_REG_IN_PROGRESS, &st_gdata->st_state); st_recv = st_int_recv; @@ -592,10 +598,10 @@ long st_register(struct st_proto_s *new_proto) if (st_gdata->is_registered[new_proto->chnl_id] == true) { pr_err(" proto %d already registered ", new_proto->chnl_id); + spin_unlock_irqrestore(&st_gdata->lock, flags); return -EALREADY; } - spin_lock_irqsave(&st_gdata->lock, flags); add_channel_to_table(st_gdata, new_proto); st_gdata->protos_registered++; new_proto->write = st_write; @@ -635,7 +641,7 @@ long st_unregister(struct st_proto_s *proto) spin_lock_irqsave(&st_gdata->lock, flags); - if (st_gdata->list[proto->chnl_id] == NULL) { + if (st_gdata->is_registered[proto->chnl_id] == false) { pr_err(" chnl_id %d not registered", proto->chnl_id); spin_unlock_irqrestore(&st_gdata->lock, flags); return -EPROTONOSUPPORT; @@ -645,6 +651,10 @@ long st_unregister(struct st_proto_s *proto) 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 "); |