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drm/udl: Refactor edid retrieving in UDL driver (v2)

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Now drm/udl driver uses drm_do_get_edid() function to retrieve and
validate all blocks of EDID data. Old approach had insufficient
validation routine and had problems with retrieving of extra blocks

Signed-off-by: Robert Tarasov <tutankhamen@chromium.org>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
[airlied: Fix spelling mistakes]
Link: https://patchwork.freedesktop.org/patch/msgid/20190314225339.162386-1-tutankhamen@chromium.org
This commit is contained in:
Robert Tarasov 2019-03-14 15:53:39 -07:00 committed by Dave Airlie
parent 3f04e0a6cf
commit a51143001d
1 changed files with 11 additions and 61 deletions
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72
drivers/gpu/drm/udl/udl_connector.c
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@ -18,18 +18,19 @@
#include "udl_connector.h"
#include "udl_drv.h"
static bool udl_get_edid_block(struct udl_device *udl, int block_idx,
u8 *buff)
static int udl_get_edid_block(void *data, u8 *buf, unsigned int block,
size_t len)
{
int ret, i;
u8 *read_buff;
struct udl_device *udl = data;
read_buff = kmalloc(2, GFP_KERNEL);
if (!read_buff)
return false;
return -1;
for (i = 0; i < EDID_LENGTH; i++) {
int bval = (i + block_idx * EDID_LENGTH) << 8;
for (i = 0; i < len; i++) {
int bval = (i + block * EDID_LENGTH) << 8;
ret = usb_control_msg(udl->udev,
usb_rcvctrlpipe(udl->udev, 0),
(0x02), (0x80 | (0x02 << 5)), bval,
@ -37,60 +38,13 @@ static bool udl_get_edid_block(struct udl_device *udl, int block_idx,
if (ret < 1) {
DRM_ERROR("Read EDID byte %d failed err %x\n", i, ret);
kfree(read_buff);
return false;
return -1;
}
buff[i] = read_buff[1];
buf[i] = read_buff[1];
}
kfree(read_buff);
return true;
}
static bool udl_get_edid(struct udl_device *udl, u8 **result_buff,
int *result_buff_size)
{
int i, extensions;
u8 *block_buff = NULL, *buff_ptr;
block_buff = kmalloc(EDID_LENGTH, GFP_KERNEL);
if (block_buff == NULL)
return false;
if (udl_get_edid_block(udl, 0, block_buff) &&
memchr_inv(block_buff, 0, EDID_LENGTH)) {
extensions = ((struct edid *)block_buff)->extensions;
if (extensions > 0) {
/* we have to read all extensions one by one */
*result_buff_size = EDID_LENGTH * (extensions + 1);
*result_buff = kmalloc(*result_buff_size, GFP_KERNEL);
buff_ptr = *result_buff;
if (buff_ptr == NULL) {
kfree(block_buff);
return false;
}
memcpy(buff_ptr, block_buff, EDID_LENGTH);
kfree(block_buff);
buff_ptr += EDID_LENGTH;
for (i = 1; i < extensions; ++i) {
if (udl_get_edid_block(udl, i, buff_ptr)) {
buff_ptr += EDID_LENGTH;
} else {
kfree(*result_buff);
*result_buff = NULL;
return false;
}
}
return true;
}
/* we have only base edid block */
*result_buff = block_buff;
*result_buff_size = EDID_LENGTH;
return true;
}
kfree(block_buff);
return false;
return 0;
}
static int udl_get_modes(struct drm_connector *connector)
@ -122,8 +76,6 @@ static enum drm_mode_status udl_mode_valid(struct drm_connector *connector,
static enum drm_connector_status
udl_detect(struct drm_connector *connector, bool force)
{
u8 *edid_buff = NULL;
int edid_buff_size = 0;
struct udl_device *udl = connector->dev->dev_private;
struct udl_drm_connector *udl_connector =
container_of(connector,
@ -136,12 +88,10 @@ udl_detect(struct drm_connector *connector, bool force)
udl_connector->edid = NULL;
}
if (!udl_get_edid(udl, &edid_buff, &edid_buff_size))
udl_connector->edid = drm_do_get_edid(connector, udl_get_edid_block, udl);
if (!udl_connector->edid)
return connector_status_disconnected;
udl_connector->edid = (struct edid *)edid_buff;
return connector_status_connected;
}