[PATCH 4/9] drm/i915: Replace struct_mutex in intel_guc_log.c

[Luiz Otavio Mello]

Remove the use of struct_mutex from intel_guc_log.c and replace it with
a dedicated lock, guc_lock, defined within the intel_guc_log struct.
    
The struct_mutex was previously used to protect concurrent access and
modification of intel_guc_log->level in intel_guc_log_set_level().
However, it was suggested that the lock should reside within the
intel_guc_log struct itself.
    
Initialize the new guc_lock in intel_guc_log_init_early(), alongside the
existing relay.lock. The lock is initialized using drmm_mutex_init(),
which also ensures it is properly destroyed when the driver is unloaded.

Signed-off-by: Luiz Otavio Mello <luiz.me...@estudante.ufscar.br>
Suggested-by: Rodrigo Vivi <rodrigo.v...@intel.com>
---
 drivers/gpu/drm/i915/gt/uc/intel_guc_log.c | 5 +++--
 drivers/gpu/drm/i915/gt/uc/intel_guc_log.h | 8 ++++++++
 2 files changed, 11 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c 
b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
index 469173791394..0104fffd5852 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.c
@@ -518,6 +518,7 @@ void intel_guc_log_init_early(struct intel_guc_log *log)
        struct drm_i915_private *i915 = guc_to_i915(guc);
 
        drmm_mutex_init(&i915->drm, &log->relay.lock);
+       drmm_mutex_init(&i915->drm, &log->guc_lock);
        INIT_WORK(&log->relay.flush_work, copy_debug_logs_work);
        log->relay.started = false;
 }
@@ -683,7 +684,7 @@ int intel_guc_log_set_level(struct intel_guc_log *log, u32 
level)
        if (level < GUC_LOG_LEVEL_DISABLED || level > GUC_LOG_LEVEL_MAX)
                return -EINVAL;
 
-       mutex_lock(&i915->struct_mutex);
+       mutex_lock(&log->guc_lock);
 
        if (log->level == level)
                goto out_unlock;
@@ -701,7 +702,7 @@ int intel_guc_log_set_level(struct intel_guc_log *log, u32 
level)
        log->level = level;
 
 out_unlock:
-       mutex_unlock(&i915->struct_mutex);
+       mutex_unlock(&log->guc_lock);
 
        return ret;
 }
diff --git a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h 
b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
index 02127703be80..13cb93ad0710 100644
--- a/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
+++ b/drivers/gpu/drm/i915/gt/uc/intel_guc_log.h
@@ -42,6 +42,14 @@ enum {
 struct intel_guc_log {
        u32 level;
 
+       /*
+        * Protects concurrent access and modification of intel_guc_log->level.
+        *
+        * This lock replaces the legacy struct_mutex usage in
+        * intel_guc_log system.
+        */
+       struct mutex guc_lock;
+
        /* Allocation settings */
        struct {
                s32 bytes;      /* Size in bytes */
-- 
2.50.1