@@ -191,6 +191,8 @@ The event interface::
/* LLDD calls these to notify the class of an event. */
void sas_notify_port_event(struct sas_phy *, enum port_event);
void sas_notify_phy_event(struct sas_phy *, enum phy_event);
+ void sas_notify_port_event_gfp(struct sas_phy *, enum port_event, gfp_t);
+ void sas_notify_phy_event_gfp(struct sas_phy *, enum phy_event, gfp_t);
When sas_register_ha() returns, those are set and can be
called by the LLDD to notify the SAS layer of such events
@@ -131,18 +131,14 @@ static void sas_phy_event_worker(struct work_struct *work)
sas_free_event(ev);
}
-int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
+static int __sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event,
+ struct asd_sas_event *ev)
{
- struct asd_sas_event *ev;
struct sas_ha_struct *ha = phy->ha;
int ret;
BUG_ON(event >= PORT_NUM_EVENTS);
- ev = sas_alloc_event(phy);
- if (!ev)
- return -ENOMEM;
-
INIT_SAS_EVENT(ev, sas_port_event_worker, phy, event);
ret = sas_queue_event(event, &ev->work, ha);
@@ -151,20 +147,41 @@ int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
return ret;
}
+
+int sas_notify_port_event_gfp(struct asd_sas_phy *phy, enum port_event event,
+ gfp_t gfp_flags)
+{
+ struct asd_sas_event *ev;
+
+ ev = sas_alloc_event_gfp(phy, gfp_flags);
+ if (!ev)
+ return -ENOMEM;
+
+ return __sas_notify_port_event(phy, event, ev);
+}
+EXPORT_SYMBOL_GPL(sas_notify_port_event_gfp);
+
+int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event)
+{
+ struct asd_sas_event *ev;
+
+ ev = sas_alloc_event(phy);
+ if (!ev)
+ return -ENOMEM;
+
+ return __sas_notify_port_event(phy, event, ev);
+}
EXPORT_SYMBOL_GPL(sas_notify_port_event);
-int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
+static inline int __sas_notify_phy_event(struct asd_sas_phy *phy,
+ enum phy_event event,
+ struct asd_sas_event *ev)
{
- struct asd_sas_event *ev;
struct sas_ha_struct *ha = phy->ha;
int ret;
BUG_ON(event >= PHY_NUM_EVENTS);
- ev = sas_alloc_event(phy);
- if (!ev)
- return -ENOMEM;
-
INIT_SAS_EVENT(ev, sas_phy_event_worker, phy, event);
ret = sas_queue_event(event, &ev->work, ha);
@@ -173,5 +190,28 @@ int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
return ret;
}
+
+int sas_notify_phy_event_gfp(struct asd_sas_phy *phy, enum phy_event event,
+ gfp_t gfp_flags)
+{
+ struct asd_sas_event *ev;
+
+ ev = sas_alloc_event_gfp(phy, gfp_flags);
+ if (!ev)
+ return -ENOMEM;
+
+ return __sas_notify_phy_event(phy, event, ev);
+}
+EXPORT_SYMBOL_GPL(sas_notify_phy_event_gfp);
+
+int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event)
+{
+ struct asd_sas_event *ev;
+
+ ev = sas_alloc_event(phy);
+ if (!ev)
+ return -ENOMEM;
+
+ return __sas_notify_phy_event(phy, event, ev);
+}
EXPORT_SYMBOL_GPL(sas_notify_phy_event);
-
@@ -584,16 +584,15 @@ sas_domain_attach_transport(struct sas_domain_function_template *dft)
}
EXPORT_SYMBOL_GPL(sas_domain_attach_transport);
-
-struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy)
+static struct asd_sas_event * __sas_alloc_event(struct asd_sas_phy *phy,
+ gfp_t gfp_flags)
{
struct asd_sas_event *event;
- gfp_t flags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
struct sas_ha_struct *sas_ha = phy->ha;
struct sas_internal *i =
to_sas_internal(sas_ha->core.shost->transportt);
- event = kmem_cache_zalloc(sas_event_cache, flags);
+ event = kmem_cache_zalloc(sas_event_cache, gfp_flags);
if (!event)
return NULL;
@@ -604,7 +603,7 @@ struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy)
if (cmpxchg(&phy->in_shutdown, 0, 1) == 0) {
pr_notice("The phy%d bursting events, shut it down.\n",
phy->id);
- sas_notify_phy_event(phy, PHYE_SHUTDOWN);
+ sas_notify_phy_event_gfp(phy, PHYE_SHUTDOWN, gfp_flags);
}
} else {
/* Do not support PHY control, stop allocating events */
@@ -618,6 +617,17 @@ struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy)
return event;
}
+struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy)
+{
+ return __sas_alloc_event(phy, in_interrupt() ? GFP_ATOMIC : GFP_KERNEL);
+}
+
+struct asd_sas_event *sas_alloc_event_gfp(struct asd_sas_phy *phy,
+ gfp_t gfp_flags)
+{
+ return __sas_alloc_event(phy, gfp_flags);
+}
+
void sas_free_event(struct asd_sas_event *event)
{
struct asd_sas_phy *phy = event->phy;
@@ -49,6 +49,7 @@ int sas_register_phys(struct sas_ha_struct *sas_ha);
void sas_unregister_phys(struct sas_ha_struct *sas_ha);
struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy);
+struct asd_sas_event *sas_alloc_event_gfp(struct asd_sas_phy *phy, gfp_t gfp_flags);
void sas_free_event(struct asd_sas_event *event);
int sas_register_ports(struct sas_ha_struct *sas_ha);
@@ -77,6 +78,7 @@ int sas_smp_phy_control(struct domain_device *dev, int phy_id,
int sas_smp_get_phy_events(struct sas_phy *phy);
int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event);
+int sas_notify_phy_event_gfp(struct asd_sas_phy *phy, enum phy_event event, gfp_t flags);
void sas_device_set_phy(struct domain_device *dev, struct sas_port *port);
struct domain_device *sas_find_dev_by_rphy(struct sas_rphy *rphy);
struct domain_device *sas_ex_to_ata(struct domain_device *ex_dev, int phy_id);
@@ -704,5 +704,9 @@ int sas_request_addr(struct Scsi_Host *shost, u8 *addr);
int sas_notify_port_event(struct asd_sas_phy *phy, enum port_event event);
int sas_notify_phy_event(struct asd_sas_phy *phy, enum phy_event event);
+int sas_notify_port_event_gfp(struct asd_sas_phy *phy, enum port_event event,
+ gfp_t gfp_flags);
+int sas_notify_phy_event_gfp(struct asd_sas_phy *phy, enum phy_event event,
+ gfp_t gfp_flags);
#endif /* _SASLIB_H_ */
sas_alloc_event() uses in_interrupt() to decide which allocation should be used. The usage of in_interrupt() in drivers is phased out and Linus clearly requested that code which changes behaviour depending on context should either be separated or the context be conveyed in an argument passed by the caller, which usually knows the context. The in_interrupt() check is also only partially correct, because it fails to choose the correct code path when just preemption or interrupts are disabled. For example, as in the following call chain: mvsas/mv_sas.c: mvs_work_queue() [process context] spin_lock_irqsave(mvs_info::lock, ) -> libsas/sas_event.c: sas_notify_phy_event() -> sas_alloc_event() -> in_interrupt() = false -> invalid GFP_KERNEL allocation -> libsas/sas_event.c: sas_notify_port_event() -> sas_alloc_event() -> in_interrupt() = false -> invalid GFP_KERNEL allocation Introduce sas_alloc_event_gfp(), sas_notify_port_event_gfp(), and sas_notify_phy_event_gfp(), which all behave like the non _gfp() variants but use a caller-passed GFP mask for allocations. For bisectability, all callers will be modified first to pass GFP context, then the non _gfp() libsas API variants will be modified to take a gfp_t by default. Fixes: 1c393b970e0f ("scsi: libsas: Use dynamic alloced work to avoid sas event lost") Signed-off-by: Ahmed S. Darwish <a.darwish@linutronix.de> Cc: John Garry <john.garry@huawei.com> Cc: Jason Yan <yanaijie@huawei.com> --- Documentation/scsi/libsas.rst | 2 + drivers/scsi/libsas/sas_event.c | 66 ++++++++++++++++++++++++------ drivers/scsi/libsas/sas_init.c | 20 ++++++--- drivers/scsi/libsas/sas_internal.h | 2 + include/scsi/libsas.h | 4 ++ 5 files changed, 76 insertions(+), 18 deletions(-)