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authorGerd Hoffmann <kraxel@redhat.com>2017-03-01 11:12:32 +0100
committerGerd Hoffmann <kraxel@redhat.com>2017-03-07 07:09:14 +0100
commit9062155de0dfdc5cdfd38caf09d7f14b1833a2ca (patch)
tree5605edb841fcfa23429c11d8e022224c35d996da /drivers/gpu/drm/qxl
parentecefd94e8bde7de4f03d6fc874378d826537df7b (diff)
qxl: limit monitor config read retries
When reading the monitor config fails, don't retry forever. If it fails ten times in a row just give up to avoid the driver hangs. Also add a small delay after each attempt, so the host has a chance to complete a partial update. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Reviewed-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk> Link: http://patchwork.freedesktop.org/patch/msgid/1488363154-6889-3-git-send-email-kraxel@redhat.com
Diffstat (limited to 'drivers/gpu/drm/qxl')
-rw-r--r--drivers/gpu/drm/qxl/qxl_display.c20
1 files changed, 12 insertions, 8 deletions
diff --git a/drivers/gpu/drm/qxl/qxl_display.c b/drivers/gpu/drm/qxl/qxl_display.c
index 2cd14bebc49c..2b99496d881a 100644
--- a/drivers/gpu/drm/qxl/qxl_display.c
+++ b/drivers/gpu/drm/qxl/qxl_display.c
@@ -157,19 +157,23 @@ static void qxl_update_offset_props(struct qxl_device *qdev)
void qxl_display_read_client_monitors_config(struct qxl_device *qdev)
{
-
struct drm_device *dev = &qdev->ddev;
- int status;
+ int status, retries;
- status = qxl_display_copy_rom_client_monitors_config(qdev);
- while (status == MONITORS_CONFIG_BAD_CRC) {
- qxl_io_log(qdev, "failed crc check for client_monitors_config,"
- " retrying\n");
+ for (retries = 0; retries < 10; retries++) {
status = qxl_display_copy_rom_client_monitors_config(qdev);
+ if (status != MONITORS_CONFIG_BAD_CRC)
+ break;
+ udelay(5);
+ }
+ if (status == MONITORS_CONFIG_BAD_CRC) {
+ qxl_io_log(qdev, "config: bad crc\n");
+ DRM_DEBUG_KMS("ignoring client monitors config: bad crc");
+ return;
}
if (status == MONITORS_CONFIG_UNCHANGED) {
- qxl_io_log(qdev, "config unchanged\n");
- DRM_DEBUG("ignoring unchanged client monitors config");
+ qxl_io_log(qdev, "config: unchanged\n");
+ DRM_DEBUG_KMS("ignoring client monitors config: unchanged");
return;
}