6.1-stable review patch. If anyone has any objections, please let me know.
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From: Thomas Zimmermann tzimmermann@suse.de
commit eb1ae34e48a09b7a1179c579aed042b032e408f4 upstream.
Managed cleanup with devm_add_action_or_reset() will release the I2C adapter when the underlying Linux device goes away. But the connector still refers to it, so this cleanup leaves behind a stale pointer in struct drm_connector.ddc.
Bind the lifetime of the I2C adapter to the connector's lifetime by using DRM's managed release. When the DRM device goes away (after the Linux device) DRM will first clean up the connector and then clean up the I2C adapter.
Signed-off-by: Thomas Zimmermann tzimmermann@suse.de Reviewed-by: Jocelyn Falempe jfalempe@redhat.com Fixes: b279df242972 ("drm/mgag200: Switch I2C code to managed cleanup") Cc: Thomas Zimmermann tzimmermann@suse.de Cc: Jocelyn Falempe jfalempe@redhat.com Cc: Dave Airlie airlied@redhat.com Cc: dri-devel@lists.freedesktop.org Cc: stable@vger.kernel.org # v6.0+ Link: https://patchwork.freedesktop.org/patch/msgid/20240513125620.6337-3-tzimmerm... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/mgag200/mgag200_i2c.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/mgag200/mgag200_i2c.c +++ b/drivers/gpu/drm/mgag200/mgag200_i2c.c @@ -31,6 +31,8 @@ #include <linux/i2c.h> #include <linux/pci.h>
+#include <drm/drm_managed.h> + #include "mgag200_drv.h"
static int mga_i2c_read_gpio(struct mga_device *mdev) @@ -86,7 +88,7 @@ static int mga_gpio_getscl(void *data) return (mga_i2c_read_gpio(mdev) & i2c->clock) ? 1 : 0; }
-static void mgag200_i2c_release(void *res) +static void mgag200_i2c_release(struct drm_device *dev, void *res) { struct mga_i2c_chan *i2c = res;
@@ -126,5 +128,5 @@ int mgag200_i2c_init(struct mga_device * if (ret) return ret;
- return devm_add_action_or_reset(dev->dev, mgag200_i2c_release, i2c); + return drmm_add_action_or_reset(dev, mgag200_i2c_release, i2c); }