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fc54b9bf15
(stable-branch of Openmoko) git-svn-id: svn://svn.openwrt.org/openwrt/trunk@13613 3c298f89-4303-0410-b956-a3cf2f4a3e73
256 lines
9.3 KiB
Diff
256 lines
9.3 KiB
Diff
From 36879992de8774cbf8686740bbda383cc6fbdcbb Mon Sep 17 00:00:00 2001
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From: \\\\\\\"Mike (mwester)\\\\\\ <mwester@dls.net>
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Date: Mon, 11 Aug 2008 20:16:09 +0100
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Subject: [PATCH] always-call-resume-dependencies.patch
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Attached is a patch that has greatly reduced the frequency of failures
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to resume (due to an oops from the glamo resume handler), and the
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dreaded "white screen after resume". I can't say that it fixes all of
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these, although I have yet to see the white-screen since applying this
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patch and suspending/resuming several hundred times (with the 30-second
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suspend on the 2008.8 image and the endless stream of GSM error messages
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generated by something in that image, it has proved to be very useful to
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do an automated stress test!)
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This patch will apply to stable, and should make stable slightly more,
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well, "stable".
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[Feel free to remove the debug messages if someone feels strongly about
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that; I left them in because I think they might be useful in triaging
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further crashes; I'm not at all convinced that this patch will fix all
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the cases of resume failures.]
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[[And, yes, this is ugly, really ugly.]]
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[[[Oh yeah - there's still one extreme case that will result in an oops:
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if a dependent driver is built as a module, and it is unloaded, and it
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happened that the preceding suspend/resume was aborted, and that abort
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happened between the dependent driver and the driver upon which it is
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dependent, then a list entry will be left behind referencing the
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unloaded module. There's just no good way to fix that given the way the
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resume dependency plumbing is connected up right now, so just avoid
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using modules for any of the drivers involved in the resume dependency
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stuff.]]]
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Regards,
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Mike (mwester)
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commit 905d2fc9c45f622418ce9ef4e67c23453aab7571
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Author: Mike Westerhof <mwester@dls.net>
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Date: Mon Aug 11 11:11:25 2008 -0500
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always-call-resume-dependencies.patch
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Ensure that a dependent resume handler is always executed,
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even if the resume handler for driver upon which it is
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dependent never suspends (and therefore never resumes either).
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Also make sure that we do not end up with duplicate
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dependencies registered, something that can happen if the
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suspend is aborted due to driver failure or an early resume
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(such as occurs when the GSM interrupts during suspend).
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Signed-off-by: Mike Westerhof <mwester@dls.net>
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---
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drivers/i2c/chips/pcf50633.c | 6 +++++
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drivers/mfd/glamo/glamo-core.c | 5 ++++
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drivers/mfd/glamo/glamo-core.h | 1 +
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drivers/serial/s3c2410.c | 7 ++++++
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include/linux/resume-dependency.h | 38 ++++++++++++++++++++++++++++++++++++-
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5 files changed, 56 insertions(+), 1 deletions(-)
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diff --git a/drivers/i2c/chips/pcf50633.c b/drivers/i2c/chips/pcf50633.c
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index 98c254c..b90ea8c 100644
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--- a/drivers/i2c/chips/pcf50633.c
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+++ b/drivers/i2c/chips/pcf50633.c
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@@ -183,6 +183,7 @@ struct pcf50633_data {
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} standby_regs;
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struct resume_dependency resume_dependency;
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+ int is_suspended;
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#endif
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};
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@@ -2366,6 +2367,8 @@ void pcf50633_register_resume_dependency(struct pcf50633_data *pcf,
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struct resume_dependency *dep)
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{
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register_resume_dependency(&pcf->resume_dependency, dep);
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+ if (pcf->is_suspended)
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+ activate_all_resume_dependencies(&pcf->resume_dependency);
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}
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EXPORT_SYMBOL_GPL(pcf50633_register_resume_dependency);
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@@ -2462,6 +2465,8 @@ static int pcf50633_suspend(struct device *dev, pm_message_t state)
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mutex_unlock(&pcf->lock);
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+ pcf->is_suspended = 1;
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+ activate_all_resume_dependencies(&pcf->resume_dependency);
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return 0;
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}
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@@ -2590,6 +2595,7 @@ static int pcf50633_resume(struct device *dev)
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get_device(&pcf->client.dev);
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pcf50633_work(&pcf->work);
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+ pcf->is_suspended = 0;
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callback_all_resume_dependencies(&pcf->resume_dependency);
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return 0;
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diff --git a/drivers/mfd/glamo/glamo-core.c b/drivers/mfd/glamo/glamo-core.c
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index c094a8c..e310382 100644
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--- a/drivers/mfd/glamo/glamo-core.c
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+++ b/drivers/mfd/glamo/glamo-core.c
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@@ -1248,6 +1248,8 @@ void glamo_register_resume_dependency(struct resume_dependency *
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{
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register_resume_dependency(&glamo_handle->resume_dependency,
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resume_dependency);
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+ if (glamo_handle->is_suspended)
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+ activate_all_resume_dependencies(&glamo_handle->resume_dependency);
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}
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EXPORT_SYMBOL_GPL(glamo_register_resume_dependency);
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@@ -1255,12 +1257,15 @@ EXPORT_SYMBOL_GPL(glamo_register_resume_dependency);
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static int glamo_suspend(struct platform_device *pdev, pm_message_t state)
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{
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glamo_power(glamo_handle, GLAMO_POWER_SUSPEND);
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+ glamo_handle->is_suspended = 1;
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+ activate_all_resume_dependencies(&glamo_handle->resume_dependency);
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return 0;
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}
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static int glamo_resume(struct platform_device *pdev)
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{
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glamo_power(glamo_handle, GLAMO_POWER_ON);
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+ glamo_handle->is_suspended = 0;
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callback_all_resume_dependencies(&glamo_handle->resume_dependency);
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return 0;
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diff --git a/drivers/mfd/glamo/glamo-core.h b/drivers/mfd/glamo/glamo-core.h
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index d3f4309..ac5eacf 100644
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--- a/drivers/mfd/glamo/glamo-core.h
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+++ b/drivers/mfd/glamo/glamo-core.h
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@@ -32,6 +32,7 @@ struct glamo_core {
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struct resume_dependency resume_dependency;
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u32 engine_enabled_bitfield;
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u32 engine_enabled_bitfield_suspend;
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+ int is_suspended;
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};
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struct glamo_script {
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diff --git a/drivers/serial/s3c2410.c b/drivers/serial/s3c2410.c
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index 2a388cf..3b1c07b 100644
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--- a/drivers/serial/s3c2410.c
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+++ b/drivers/serial/s3c2410.c
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@@ -116,6 +116,7 @@ struct s3c24xx_uart_port {
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struct uart_port port;
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struct resume_dependency resume_dependency;
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+ int is_suspended;
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};
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@@ -1188,10 +1189,13 @@ static int s3c24xx_serial_remove(struct platform_device *dev)
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static int s3c24xx_serial_suspend(struct platform_device *dev, pm_message_t state)
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{
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struct uart_port *port = s3c24xx_dev_to_port(&dev->dev);
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+ struct s3c24xx_uart_port *ourport = to_ourport(port);
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if (port)
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uart_suspend_port(&s3c24xx_uart_drv, port);
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+ activate_all_resume_dependencies(&ourport->resume_dependency);
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+ ourport->is_suspended = 1;
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return 0;
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}
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@@ -1202,6 +1206,8 @@ void s3c24xx_serial_register_resume_dependency(struct resume_dependency *
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register_resume_dependency(&ourport->resume_dependency,
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resume_dependency);
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+ if (ourport->is_suspended)
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+ activate_all_resume_dependencies(&ourport->resume_dependency);
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}
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EXPORT_SYMBOL(s3c24xx_serial_register_resume_dependency);
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@@ -1218,6 +1224,7 @@ static int s3c24xx_serial_resume(struct platform_device *dev)
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uart_resume_port(&s3c24xx_uart_drv, port);
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}
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+ ourport->is_suspended = 0;
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callback_all_resume_dependencies(&ourport->resume_dependency);
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return 0;
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diff --git a/include/linux/resume-dependency.h b/include/linux/resume-dependency.h
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index e0c0f33..959cadd 100644
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--- a/include/linux/resume-dependency.h
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+++ b/include/linux/resume-dependency.h
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@@ -38,6 +38,7 @@ struct resume_dependency {
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*/
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#define init_resume_dependency_list(_head) \
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+ printk(KERN_ERR "##### init_resume_dependency_list(head=%p)\n", (_head)); \
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INIT_LIST_HEAD(&(_head)->list);
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@@ -48,7 +49,18 @@ struct resume_dependency {
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*/
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#define register_resume_dependency(_head, _dep) { \
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- (_dep)->called_flag = 0; \
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+ struct list_head *_pos, *_q; \
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+ struct resume_dependency *_d; \
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+\
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+ printk(KERN_ERR "##### register_resume_dependency(head=%p, dep=%p)\n", (_head), (_dep)); \
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+ (_dep)->called_flag = 1; \
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+ list_for_each_safe(_pos, _q, &((_head)->list)) { \
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+ _d = list_entry(_pos, struct resume_dependency, list); \
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+ if (_d == (_dep)) { \
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+ list_del(_pos); \
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+ printk(KERN_ERR "##### duplicate dependency removed first\n"); \
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+ } \
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+ } \
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list_add(&(_dep)->list, &(_head)->list); \
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}
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@@ -61,14 +73,38 @@ struct resume_dependency {
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struct list_head *_pos, *_q; \
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struct resume_dependency *_dep; \
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\
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+ printk(KERN_ERR "##### callback_all_resume_dependencies(head=%p)\n", (_head)); \
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list_for_each_safe(_pos, _q, &((_head)->list)) { \
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_dep = list_entry(_pos, struct resume_dependency, list); \
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+ printk(KERN_ERR "##### callback list entry (head=%p, dep=%p)\n", (_head), (_dep)); \
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_dep->called_flag = 1; \
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+ printk(KERN_ERR "##### callback=%p(context=%p))\n", (_dep->callback),(_dep->context)); \
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(_dep->callback)(_dep->context); \
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list_del(_pos); \
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} \
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}
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+/* When a dependency is added, it is not actually active; the dependent resume
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+ * handler will function as normal. The dependency is activated by the suspend
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+ * handler for the driver that will be doing the callbacks. This ensures that
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+ * if the suspend is aborted for any reason (error, driver busy, etc), that all
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+ * suspended drivers will resume, even if the driver upon which they are dependent
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+ * did not suspend, and hence will not resume, and thus would be unable to perform
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+ * the callbacks.
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+ */
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+
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+#define activate_all_resume_dependencies(_head) { \
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+ struct list_head *_pos, *_q; \
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+ struct resume_dependency *_dep; \
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+\
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+ printk(KERN_ERR "##### activate_all_resume_dependencies(head=%p)\n", (_head)); \
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+ list_for_each_safe(_pos, _q, &((_head)->list)) { \
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+ _dep = list_entry(_pos, struct resume_dependency, list); \
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+ printk(KERN_ERR "##### activating callback list entry (head=%p, dep=%p)\n", (_head), (_dep)); \
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+ _dep->called_flag = 0; \
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+ } \
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+}
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+
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/* if your resume action is dependent on multiple drivers being resumed already,
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* register the same callback with each driver you are dependent on, and check
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* .called_flag for all of the struct resume_dependency. When they are all 1
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--
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1.5.6.5
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