From patchwork Mon Jul 30 19:38:57 2012 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Bruno_Pr=C3=A9mont?= X-Patchwork-Id: 1256361 X-Patchwork-Delegate: jikos@jikos.cz Return-Path: X-Original-To: patchwork-linux-input@patchwork.kernel.org Delivered-To: patchwork-process-083081@patchwork1.kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by patchwork1.kernel.org (Postfix) with ESMTP id 4780D3FCC5 for ; Mon, 30 Jul 2012 19:47:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754873Ab2G3Tr2 (ORCPT ); Mon, 30 Jul 2012 15:47:28 -0400 Received: from smtprelay.restena.lu ([158.64.1.62]:58121 "EHLO smtprelay.restena.lu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754874Ab2G3TrZ convert rfc822-to-8bit (ORCPT ); Mon, 30 Jul 2012 15:47:25 -0400 Received: from smtprelay.restena.lu (localhost [127.0.0.1]) by smtprelay.restena.lu (Postfix) with ESMTP id BA2D610694; Mon, 30 Jul 2012 21:39:31 +0200 (CEST) Received: from neptune.home (unknown [IPv6:2001:a18:1:1402:2c0:9fff:fe2d:39d]) by smtprelay.restena.lu (Postfix) with ESMTP id 7B7801058E; Mon, 30 Jul 2012 21:39:31 +0200 (CEST) Date: Mon, 30 Jul 2012 21:38:57 +0200 From: Bruno =?UTF-8?B?UHLDqW1vbnQ=?= To: linux-input@vger.kernel.org, linux-kernel@vger.kernel.org, Jiri Kosina Cc: Jaya Kumar , linux-fbdev@vger.kernel.org Subject: [PATCH 5/7] HID: picoLCD: Improve unplug handling Message-ID: <20120730213857.75d34cf8@neptune.home> X-Mailer: Claws Mail 3.8.0 (GTK+ 2.24.10; i686-pc-linux-gnu) References: <20120730213656.0a9f6d30@neptune.home> Mime-Version: 1.0 X-Virus-Scanned: ClamAV Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@vger.kernel.org Stop earlier attempting to submit new reports/URBs (though locking and usbhid still prevents to bail out early enough to not produce multiple hid-picolcd 0003:04D8:C002.0003: usb_submit_urb(out) failed: -19 messages in kernel log. Strengthen framebuffer removal to be less racy, though quick bind/unbind sequences triggered via sysfs still trigger weird behavior: - either SLAB corruptions Seems related to fbdefio - immediate system reboot Unexplained as there is no explaining output on any console, not even serial console. (note: picoLCD is hosting fbcon in both cases, but manual plug/unplug seems too slow to trigger madness) Signed-off-by: Bruno Prémont --- drivers/hid/hid-picolcd_backlight.c | 3 +- drivers/hid/hid-picolcd_core.c | 21 ++++++++++++----- drivers/hid/hid-picolcd_fb.c | 41 +++++++++++++++++++++------------- drivers/hid/hid-picolcd_lcd.c | 3 +- drivers/hid/hid-picolcd_leds.c | 3 +- 5 files changed, 46 insertions(+), 25 deletions(-) diff --git a/drivers/hid/hid-picolcd_backlight.c b/drivers/hid/hid-picolcd_backlight.c index cd1ccd7..b91f309 100644 --- a/drivers/hid/hid-picolcd_backlight.c +++ b/drivers/hid/hid-picolcd_backlight.c @@ -45,7 +45,8 @@ static int picolcd_set_brightness(struct backlight_device *bdev) data->lcd_power = bdev->props.power; spin_lock_irqsave(&data->lock, flags); hid_set_field(report->field[0], 0, data->lcd_power == FB_BLANK_UNBLANK ? data->lcd_brightness : 0); - usbhid_submit_report(data->hdev, report, USB_DIR_OUT); + if (!(data->status & PICOLCD_FAILED)) + usbhid_submit_report(data->hdev, report, USB_DIR_OUT); spin_unlock_irqrestore(&data->lock, flags); return 0; } diff --git a/drivers/hid/hid-picolcd_core.c b/drivers/hid/hid-picolcd_core.c index 8d5d341..2d7ef68 100644 --- a/drivers/hid/hid-picolcd_core.c +++ b/drivers/hid/hid-picolcd_core.c @@ -105,12 +105,17 @@ struct picolcd_pending *picolcd_send_and_wait(struct hid_device *hdev, hid_set_field(report->field[i], j, k < size ? raw_data[k] : 0); k++; } - data->pending = work; - usbhid_submit_report(data->hdev, report, USB_DIR_OUT); - spin_unlock_irqrestore(&data->lock, flags); - wait_for_completion_interruptible_timeout(&work->ready, HZ*2); - spin_lock_irqsave(&data->lock, flags); - data->pending = NULL; + if (data->status & PICOLCD_FAILED) { + kfree(work); + work = NULL; + } else { + data->pending = work; + usbhid_submit_report(data->hdev, report, USB_DIR_OUT); + spin_unlock_irqrestore(&data->lock, flags); + wait_for_completion_interruptible_timeout(&work->ready, HZ*2); + spin_lock_irqsave(&data->lock, flags); + data->pending = NULL; + } spin_unlock_irqrestore(&data->lock, flags); mutex_unlock(&data->mutex); return work; @@ -235,6 +240,10 @@ int picolcd_reset(struct hid_device *hdev) /* perform the reset */ hid_set_field(report->field[0], 0, 1); + if (data->status & PICOLCD_FAILED) { + spin_unlock_irqrestore(&data->lock, flags); + return -ENODEV; + } usbhid_submit_report(hdev, report, USB_DIR_OUT); spin_unlock_irqrestore(&data->lock, flags); diff --git a/drivers/hid/hid-picolcd_fb.c b/drivers/hid/hid-picolcd_fb.c index 602786c..4d8e22c 100644 --- a/drivers/hid/hid-picolcd_fb.c +++ b/drivers/hid/hid-picolcd_fb.c @@ -226,13 +226,16 @@ int picolcd_fb_reset(struct picolcd_data *data, int clear) } /* Update fb_vbitmap from the screen_base and send changed tiles to device */ -static void picolcd_fb_update(struct picolcd_data *data) +static void picolcd_fb_update(struct fb_info *info) { int chip, tile, n; unsigned long flags; + struct picolcd_data *data; + mutex_lock(&info->lock); + data = info->par; if (!data) - return; + goto out; spin_lock_irqsave(&data->lock, flags); if (!(data->status & PICOLCD_READY_FB)) { @@ -256,17 +259,31 @@ static void picolcd_fb_update(struct picolcd_data *data) data->fb_bitmap, data->fb_bpp, chip, tile) || data->fb_force) { n += 2; - if (data->status & PICOLCD_FAILED) - return; /* device lost! */ if (n >= HID_OUTPUT_FIFO_SIZE / 2) { + mutex_unlock(&info->lock); usbhid_wait_io(data->hdev); + mutex_lock(&info->lock); + data = info->par; + if (!data) + goto out; + spin_lock_irqsave(&data->lock, flags); + if (data->status & PICOLCD_FAILED) { + spin_unlock_irqrestore(&data->lock, flags); + goto out; + } + spin_unlock_irqrestore(&data->lock, flags); n = 0; } picolcd_fb_send_tile(data->hdev, chip, tile); } data->fb_force = false; - if (n) + if (n) { + mutex_unlock(&info->lock); usbhid_wait_io(data->hdev); + return; + } +out: + mutex_unlock(&info->lock); } /* Stub to call the system default and update the image on the picoLCD */ @@ -327,17 +344,12 @@ static int picolcd_fb_blank(int blank, struct fb_info *info) static void picolcd_fb_destroy(struct fb_info *info) { - struct picolcd_data *data; - /* make sure no work is deferred */ - cancel_delayed_work_sync(&info->deferred_work); - data = info->par; - info->par = NULL; - if (data) - data->fb_info = NULL; + fb_deferred_io_cleanup(info); vfree((u8 *)info->fix.smem_start); framebuffer_release(info); + printk(KERN_DEBUG "picolcd_fb_destroy(%p)\n", info); } static int picolcd_fb_check_var(struct fb_var_screeninfo *var, struct fb_info *info) @@ -425,7 +437,7 @@ static struct fb_ops picolcdfb_ops = { /* Callback from deferred IO workqueue */ static void picolcd_fb_deferred_io(struct fb_info *info, struct list_head *pagelist) { - picolcd_fb_update(info->par); + picolcd_fb_update(info); } static const struct fb_deferred_io picolcd_fb_defio = { @@ -582,10 +594,7 @@ void picolcd_exit_framebuffer(struct picolcd_data *data) return; device_remove_file(&data->hdev->dev, &dev_attr_fb_update_rate); - mutex_lock(&info->lock); - fb_deferred_io_cleanup(info); info->par = NULL; - mutex_unlock(&info->lock); unregister_framebuffer(info); data->fb_vbitmap = NULL; data->fb_bitmap = NULL; diff --git a/drivers/hid/hid-picolcd_lcd.c b/drivers/hid/hid-picolcd_lcd.c index 64a067f..2d0ddc5 100644 --- a/drivers/hid/hid-picolcd_lcd.c +++ b/drivers/hid/hid-picolcd_lcd.c @@ -47,7 +47,8 @@ static int picolcd_set_contrast(struct lcd_device *ldev, int contrast) data->lcd_contrast = contrast & 0x0ff; spin_lock_irqsave(&data->lock, flags); hid_set_field(report->field[0], 0, data->lcd_contrast); - usbhid_submit_report(data->hdev, report, USB_DIR_OUT); + if (!(data->status & PICOLCD_FAILED)) + usbhid_submit_report(data->hdev, report, USB_DIR_OUT); spin_unlock_irqrestore(&data->lock, flags); return 0; } diff --git a/drivers/hid/hid-picolcd_leds.c b/drivers/hid/hid-picolcd_leds.c index 5573cd8..28cb6a4 100644 --- a/drivers/hid/hid-picolcd_leds.c +++ b/drivers/hid/hid-picolcd_leds.c @@ -54,7 +54,8 @@ void picolcd_leds_set(struct picolcd_data *data) spin_lock_irqsave(&data->lock, flags); hid_set_field(report->field[0], 0, data->led_state); - usbhid_submit_report(data->hdev, report, USB_DIR_OUT); + if (!(data->status & PICOLCD_FAILED)) + usbhid_submit_report(data->hdev, report, USB_DIR_OUT); spin_unlock_irqrestore(&data->lock, flags); }