From 9062155de0dfdc5cdfd38caf09d7f14b1833a2ca Mon Sep 17 00:00:00 2001 From: Gerd Hoffmann Date: Wed, 1 Mar 2017 11:12:32 +0100 Subject: [PATCH] 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 Reviewed-by: Gabriel Krisman Bertazi Link: http://patchwork.freedesktop.org/patch/msgid/1488363154-6889-3-git-send-email-kraxel@redhat.com --- drivers/gpu/drm/qxl/qxl_display.c | 20 ++++++++++++-------- 1 file 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; } -- 2.20.1