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Message-id: <4914B8AC.7070202@acm.org>
Date: Fri, 07 Nov 2008 15:52:44 -0600
From: Corey Minyard <minyard@....org>
To: "Darrick J. Wong" <djwong@...ibm.com>
Cc: Jean Delvare <khali@...ux-fr.org>,
openipmi-developer@...ts.sourceforge.net,
linux-kernel <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
lm-sensors <lm-sensors@...sensors.org>
Subject: Re: [Openipmi-developer] [PATCH] Fix platform drivers that crash on
suspend/resume
Ok, thanks for this.
Might this be a candidate for the stable-kernel?
Acked-by: Corey Minyard <cminyard@...sta.com>
Darrick J. Wong wrote:
> It turns out that if one registers a struct platform_device, the platform
> device code expects that platform_device.device->driver points to a struct
> driver inside a struct platform_driver. This is not the case with the ipmi-si,
> ipmi-msghandler and ibmaem drivers, which causes the suspend/resume hook
> functions to jump off into nowhere, causing a crash. Make this assumption hold
> true for these three drivers.
>
> Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
> ---
>
> drivers/char/ipmi/ipmi_msghandler.c | 20 +++++++++++---------
> drivers/char/ipmi/ipmi_si_intf.c | 16 +++++++++-------
> drivers/hwmon/ibmaem.c | 18 ++++++++++--------
> 3 files changed, 30 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
> index 8a59aaa..7a88dfd 100644
> --- a/drivers/char/ipmi/ipmi_msghandler.c
> +++ b/drivers/char/ipmi/ipmi_msghandler.c
> @@ -422,9 +422,11 @@ struct ipmi_smi {
> /**
> * The driver model view of the IPMI messaging driver.
> */
> -static struct device_driver ipmidriver = {
> - .name = "ipmi",
> - .bus = &platform_bus_type
> +static struct platform_driver ipmidriver = {
> + .driver = {
> + .name = "ipmi",
> + .bus = &platform_bus_type
> + }
> };
> static DEFINE_MUTEX(ipmidriver_mutex);
>
> @@ -2384,9 +2386,9 @@ static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum,
> * representing the interfaced BMC already
> */
> if (bmc->guid_set)
> - old_bmc = ipmi_find_bmc_guid(&ipmidriver, bmc->guid);
> + old_bmc = ipmi_find_bmc_guid(&ipmidriver.driver, bmc->guid);
> else
> - old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver,
> + old_bmc = ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
> bmc->id.product_id,
> bmc->id.device_id);
>
> @@ -2416,7 +2418,7 @@ static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum,
> snprintf(name, sizeof(name),
> "ipmi_bmc.%4.4x", bmc->id.product_id);
>
> - while (ipmi_find_bmc_prod_dev_id(&ipmidriver,
> + while (ipmi_find_bmc_prod_dev_id(&ipmidriver.driver,
> bmc->id.product_id,
> bmc->id.device_id)) {
> if (!warn_printed) {
> @@ -2446,7 +2448,7 @@ static int ipmi_bmc_register(ipmi_smi_t intf, int ifnum,
> " Unable to allocate platform device\n");
> return -ENOMEM;
> }
> - bmc->dev->dev.driver = &ipmidriver;
> + bmc->dev->dev.driver = &ipmidriver.driver;
> dev_set_drvdata(&bmc->dev->dev, bmc);
> kref_init(&bmc->refcount);
>
> @@ -4247,7 +4249,7 @@ static int ipmi_init_msghandler(void)
> if (initialized)
> return 0;
>
> - rv = driver_register(&ipmidriver);
> + rv = driver_register(&ipmidriver.driver);
> if (rv) {
> printk(KERN_ERR PFX "Could not register IPMI driver\n");
> return rv;
> @@ -4308,7 +4310,7 @@ static __exit void cleanup_ipmi(void)
> remove_proc_entry(proc_ipmi_root->name, NULL);
> #endif /* CONFIG_PROC_FS */
>
> - driver_unregister(&ipmidriver);
> + driver_unregister(&ipmidriver.driver);
>
> initialized = 0;
>
> diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
> index 3123bf5..3000135 100644
> --- a/drivers/char/ipmi/ipmi_si_intf.c
> +++ b/drivers/char/ipmi/ipmi_si_intf.c
> @@ -114,9 +114,11 @@ static char *si_to_str[] = { "kcs", "smic", "bt" };
>
> #define DEVICE_NAME "ipmi_si"
>
> -static struct device_driver ipmi_driver = {
> - .name = DEVICE_NAME,
> - .bus = &platform_bus_type
> +static struct platform_driver ipmi_driver = {
> + .driver = {
> + .name = DEVICE_NAME,
> + .bus = &platform_bus_type
> + }
> };
>
>
> @@ -2868,7 +2870,7 @@ static int try_smi_init(struct smi_info *new_smi)
> goto out_err;
> }
> new_smi->dev = &new_smi->pdev->dev;
> - new_smi->dev->driver = &ipmi_driver;
> + new_smi->dev->driver = &ipmi_driver.driver;
>
> rv = platform_device_add(new_smi->pdev);
> if (rv) {
> @@ -2983,7 +2985,7 @@ static __devinit int init_ipmi_si(void)
> initialized = 1;
>
> /* Register the device drivers. */
> - rv = driver_register(&ipmi_driver);
> + rv = driver_register(&ipmi_driver.driver);
> if (rv) {
> printk(KERN_ERR
> "init_ipmi_si: Unable to register driver: %d\n",
> @@ -3052,7 +3054,7 @@ static __devinit int init_ipmi_si(void)
> #ifdef CONFIG_PPC_OF
> of_unregister_platform_driver(&ipmi_of_platform_driver);
> #endif
> - driver_unregister(&ipmi_driver);
> + driver_unregister(&ipmi_driver.driver);
> printk(KERN_WARNING
> "ipmi_si: Unable to find any System Interface(s)\n");
> return -ENODEV;
> @@ -3151,7 +3153,7 @@ static __exit void cleanup_ipmi_si(void)
> cleanup_one_si(e);
> mutex_unlock(&smi_infos_lock);
>
> - driver_unregister(&ipmi_driver);
> + driver_unregister(&ipmi_driver.driver);
> }
> module_exit(cleanup_ipmi_si);
>
> diff --git a/drivers/hwmon/ibmaem.c b/drivers/hwmon/ibmaem.c
> index 7b0ed5d..fe74609 100644
> --- a/drivers/hwmon/ibmaem.c
> +++ b/drivers/hwmon/ibmaem.c
> @@ -88,9 +88,11 @@
> static DEFINE_IDR(aem_idr);
> static DEFINE_SPINLOCK(aem_idr_lock);
>
> -static struct device_driver aem_driver = {
> - .name = DRVNAME,
> - .bus = &platform_bus_type,
> +static struct platform_driver aem_driver = {
> + .driver = {
> + .name = DRVNAME,
> + .bus = &platform_bus_type,
> + }
> };
>
> struct aem_ipmi_data {
> @@ -583,7 +585,7 @@ static int aem_init_aem1_inst(struct aem_ipmi_data *probe, u8 module_handle)
> data->pdev = platform_device_alloc(DRVNAME, data->id);
> if (!data->pdev)
> goto dev_err;
> - data->pdev->dev.driver = &aem_driver;
> + data->pdev->dev.driver = &aem_driver.driver;
>
> res = platform_device_add(data->pdev);
> if (res)
> @@ -716,7 +718,7 @@ static int aem_init_aem2_inst(struct aem_ipmi_data *probe,
> data->pdev = platform_device_alloc(DRVNAME, data->id);
> if (!data->pdev)
> goto dev_err;
> - data->pdev->dev.driver = &aem_driver;
> + data->pdev->dev.driver = &aem_driver.driver;
>
> res = platform_device_add(data->pdev);
> if (res)
> @@ -1085,7 +1087,7 @@ static int __init aem_init(void)
> {
> int res;
>
> - res = driver_register(&aem_driver);
> + res = driver_register(&aem_driver.driver);
> if (res) {
> printk(KERN_ERR "Can't register aem driver\n");
> return res;
> @@ -1097,7 +1099,7 @@ static int __init aem_init(void)
> return 0;
>
> ipmi_reg_err:
> - driver_unregister(&aem_driver);
> + driver_unregister(&aem_driver.driver);
> return res;
>
> }
> @@ -1107,7 +1109,7 @@ static void __exit aem_exit(void)
> struct aem_data *p1, *next1;
>
> ipmi_smi_watcher_unregister(&driver_data.bmc_events);
> - driver_unregister(&aem_driver);
> + driver_unregister(&aem_driver.driver);
> list_for_each_entry_safe(p1, next1, &driver_data.aem_devices, list)
> aem_delete(p1);
> }
>
>
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