Merge tag 'drm-msm-fixes-2023-01-16' of https://gitlab.freedesktop.org/drm/msm into drm-fixes

msm-fixes for v6.3-rc5

Two GPU fixes which were meant to be part of the previous pull request,
but I'd forgotten to fetch from gitlab after the MR was merged so that
git tag was applied to the wrong commit.

- kexec shutdown fix
- fix potential double free

Signed-off-by: Dave Airlie <[email protected]>
From: Rob Clark <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/CAF6AEGskguoVsz2wqAK2k+f32LwcVY5JC6+e2RwLqZswz3RY2Q@mail.gmail.com

Author: airlied

drivers/gpu/drm/msm/adreno/adreno_device.c

@@ -551,13 +551,14 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
 	return 0;
 }
 
+static int adreno_system_suspend(struct device *dev);
 static void adreno_unbind(struct device *dev, struct device *master,
 		void *data)
 {
 	struct msm_drm_private *priv = dev_get_drvdata(master);
 	struct msm_gpu *gpu = dev_to_gpu(dev);
 
-	pm_runtime_force_suspend(dev);
+	WARN_ON_ONCE(adreno_system_suspend(dev));
 	gpu->funcs->destroy(gpu);
 
 	priv->gpu_pdev = NULL;
@@ -609,7 +610,7 @@ static int adreno_remove(struct platform_device *pdev)
 
 static void adreno_shutdown(struct platform_device *pdev)
 {
-	pm_runtime_force_suspend(&pdev->dev);
+	WARN_ON_ONCE(adreno_system_suspend(&pdev->dev));
 }
 
 static const struct of_device_id dt_match[] = {

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -352,6 +352,8 @@ int adreno_set_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
 		/* Ensure string is null terminated: */
 		str[len] = '\0';
 
+		mutex_lock(&gpu->lock);
+
 		if (param == MSM_PARAM_COMM) {
 			paramp = &ctx->comm;
 		} else {
@@ -361,6 +363,8 @@ int adreno_set_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
 		kfree(*paramp);
 		*paramp = str;
 
+		mutex_unlock(&gpu->lock);
+
 		return 0;
 	}
 	case MSM_PARAM_SYSPROF:

drivers/gpu/drm/msm/msm_gpu.c

@@ -335,6 +335,8 @@ static void get_comm_cmdline(struct msm_gem_submit *submit, char **comm, char **
 	struct msm_file_private *ctx = submit->queue->ctx;
 	struct task_struct *task;
 
+	WARN_ON(!mutex_is_locked(&submit->gpu->lock));
+
 	/* Note that kstrdup will return NULL if argument is NULL: */
 	*comm = kstrdup(ctx->comm, GFP_KERNEL);
 	*cmd  = kstrdup(ctx->cmdline, GFP_KERNEL);

drivers/gpu/drm/msm/msm_gpu.h

@@ -376,10 +376,18 @@ struct msm_file_private {
 	 */
 	int sysprof;
 
-	/** comm: Overridden task comm, see MSM_PARAM_COMM */
+	/**
+	 * comm: Overridden task comm, see MSM_PARAM_COMM
+	 *
+	 * Accessed under msm_gpu::lock
+	 */
 	char *comm;
 
-	/** cmdline: Overridden task cmdline, see MSM_PARAM_CMDLINE */
+	/**
+	 * cmdline: Overridden task cmdline, see MSM_PARAM_CMDLINE
+	 *
+	 * Accessed under msm_gpu::lock
+	 */
 	char *cmdline;
 
 	/**