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drm/udl: Move drm_dev_{enter, exit}() into udl_get_edid_block()

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Protect the code in udl_get_edid_block() with drm_dev_enter() and
drm_dev_exit(), so that all callers automatically invoke it. The
function uses hardware resources, which can be hot-unplugged at
any time. The other code in udl_connector_detect() does not use the
resources of the hardware device and therefore does not require
protection.

This change will allow to use udl_get_edid_block() in various
contexts easily.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240510154841.11370-3-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann
2024-05-10 17:47:09 +02:00
parent 5aed213c7c
commit bf17547893
1 changed files with 11 additions and 9 deletions
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20
drivers/gpu/drm/udl/udl_modeset.c
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@@ -434,13 +434,18 @@ static int udl_get_edid_block(void *data, u8 *buf, unsigned int block, size_t le
struct drm_device *dev = &udl->drm;
struct usb_device *udev = udl_to_usb_device(udl);
u8 *read_buff;
int ret;
int idx, ret;
size_t i;
read_buff = kmalloc(2, GFP_KERNEL);
if (!read_buff)
return -ENOMEM;
if (!drm_dev_enter(dev, &idx)) {
ret = -ENODEV;
goto err_kfree;
}
for (i = 0; i < len; i++) {
int bval = (i + block * EDID_LENGTH) << 8;
@@ -449,20 +454,23 @@ static int udl_get_edid_block(void *data, u8 *buf, unsigned int block, size_t le
0xA1, read_buff, 2, USB_CTRL_GET_TIMEOUT);
if (ret < 0) {
drm_err(dev, "Read EDID byte %zu failed err %x\n", i, ret);
goto err_kfree;
goto err_drm_dev_exit;
} else if (ret < 1) {
ret = -EIO;
drm_err(dev, "Read EDID byte %zu failed\n", i);
goto err_kfree;
goto err_drm_dev_exit;
}
buf[i] = read_buff[1];
}
drm_dev_exit(idx);
kfree(read_buff);
return 0;
err_drm_dev_exit:
drm_dev_exit(idx);
err_kfree:
kfree(read_buff);
return ret;
@@ -474,21 +482,15 @@ static enum drm_connector_status udl_connector_detect(struct drm_connector *conn
struct udl_device *udl = to_udl(dev);
struct udl_connector *udl_connector = to_udl_connector(connector);
enum drm_connector_status status = connector_status_disconnected;
int idx;
/* cleanup previous EDID */
kfree(udl_connector->edid);
udl_connector->edid = NULL;
if (!drm_dev_enter(dev, &idx))
return connector_status_disconnected;
udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
if (udl_connector->edid)
status = connector_status_connected;
drm_dev_exit(idx);
return status;
}