[PATCH AUTOSEL 5.17 021/149] drm/amdkfd: Don't take process mutex for svm ioctls

[Sasha Levin]

From: Philip Yang <philip.y...@amd.com>

[ Upstream commit ac7c48c0cce00d03b3c95fddcccb0a45257e33e3 ]

SVM ioctls take proper svms->lock to handle race conditions, don't need
take process mutex to serialize ioctls. This also fixes circular locking
warning:

WARNING: possible circular locking dependency detected

  Possible unsafe locking scenario:

        CPU0                    CPU1
        ----                    ----
   lock((work_completion)(&svms->deferred_list_work));
                                lock(&process->mutex);
                     lock((work_completion)(&svms->deferred_list_work));
   lock(&process->mutex);

   *** DEADLOCK ***

Signed-off-by: Philip Yang <philip.y...@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehl...@amd.com>
Signed-off-by: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 337953af7c2f..70122978bdd0 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1846,13 +1846,9 @@ static int kfd_ioctl_svm(struct file *filep, struct 
kfd_process *p, void *data)
        if (!args->start_addr || !args->size)
                return -EINVAL;
 
-       mutex_lock(&p->mutex);
-
        r = svm_ioctl(p, args->op, args->start_addr, args->size, args->nattr,
                      args->attrs);
 
-       mutex_unlock(&p->mutex);
-
        return r;
 }
 #else
-- 
2.34.1