Check return of __xa_store when registering a context as this can fail
in a rare case if not memory can not be allocated. If this occurs fall
back on the tasklet flow control and try again in the future.
Signed-off-by: Matthew Brost <matthew.brost@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c | 14 +++++++++++---
1 file changed, 11 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
index fce5c1d8cfda..2873018eb36e 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_submission.c
@@ -502,18 +502,24 @@ static inline bool lrc_desc_registered(struct intel_guc *guc, u32 id)
return __get_context(guc, id);
}
-static inline void set_lrc_desc_registered(struct intel_guc *guc, u32 id,
+static inline int set_lrc_desc_registered(struct intel_guc *guc, u32 id,
struct intel_context *ce)
{
unsigned long flags;
+ void *ret;
/*
* xarray API doesn't have xa_save_irqsave wrapper, so calling the
* lower level functions directly.
*/
xa_lock_irqsave(&guc->context_lookup, flags);
- __xa_store(&guc->context_lookup, id, ce, GFP_ATOMIC);
+ ret = __xa_store(&guc->context_lookup, id, ce, GFP_ATOMIC);
xa_unlock_irqrestore(&guc->context_lookup, flags);
+
+ if (unlikely(xa_is_err(ret)))
+ return -EBUSY; /* Try again in future */
+
+ return 0;
}
static int guc_submission_send_busy_loop(struct intel_guc* guc,
@@ -1840,7 +1846,9 @@ static int guc_lrc_desc_pin(struct intel_context *ce, bool loop)
rcu_read_unlock();
reset_lrc_desc(guc, desc_idx);
- set_lrc_desc_registered(guc, desc_idx, ce);
+ ret = set_lrc_desc_registered(guc, desc_idx, ce);
+ if (unlikely(ret))
+ return ret;
desc = __get_lrc_desc(guc, desc_idx);
desc->engine_class = engine_class_to_guc_class(engine->class);
--
2.28.0
