From 865212abb5268d56ab5e1035426bbeebba01138e Mon Sep 17 00:00:00 2001 From: Aaro Koskinen Date: Mon, 7 Feb 2011 16:08:04 +0200 Subject: arm: mach-omap2: smartreflex: fix another memory leak Temporary strings with volt_* file names should be released after the debugfs entries are created. While at it, also simplify the string allocation, and use just snprintf() to create the name. The patch eliminates kmemleak reports with the following stack trace (multiple objects depending on HW): unreferenced object 0xcedbc5a0 (size 64): comm "swapper", pid 1, jiffies 4294929375 (age 423.734s) hex dump (first 32 bytes): 76 6f 6c 74 5f 39 37 35 30 30 30 00 00 00 00 00 volt_975000..... 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ backtrace: [] create_object+0x104/0x208 [] kmem_cache_alloc_trace+0xf0/0x17c [] omap_sr_probe+0x314/0x420 [] platform_drv_probe+0x18/0x1c [] driver_probe_device+0xc8/0x188 [] __driver_attach+0x68/0x8c [] bus_for_each_dev+0x44/0x74 [] bus_add_driver+0xa0/0x228 [] driver_register+0xa8/0x130 [] platform_driver_probe+0x18/0x8c [] sr_init+0x40/0x74 [] do_one_initcall+0xc8/0x1a0 [] kernel_init+0x150/0x218 [] kernel_thread_exit+0x0/0x8 [] 0xffffffff Signed-off-by: Aaro Koskinen Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/smartreflex.c | 15 +++------------ 1 file changed, 3 insertions(+), 12 deletions(-) (limited to 'arch/arm/mach-omap2/smartreflex.c') diff --git a/arch/arm/mach-omap2/smartreflex.c b/arch/arm/mach-omap2/smartreflex.c index 95ac336fe3f..5a849c98173 100644 --- a/arch/arm/mach-omap2/smartreflex.c +++ b/arch/arm/mach-omap2/smartreflex.c @@ -926,19 +926,10 @@ static int __init omap_sr_probe(struct platform_device *pdev) } for (i = 0; i < sr_info->nvalue_count; i++) { - char *name; - char volt_name[32]; - - name = kzalloc(NVALUE_NAME_LEN + 1, GFP_KERNEL); - if (!name) { - dev_err(&pdev->dev, "%s: Unable to allocate memory" - " for n-value directory name\n", __func__); - return -ENOMEM; - } + char name[NVALUE_NAME_LEN + 1]; - strcpy(name, "volt_"); - sprintf(volt_name, "%d", volt_data[i].volt_nominal); - strcat(name, volt_name); + snprintf(name, sizeof(name), "volt_%d", + volt_data[i].volt_nominal); (void) debugfs_create_x32(name, S_IRUGO | S_IWUSR, nvalue_dir, &(sr_info->nvalue_table[i].nvalue)); } -- cgit v1.2.3-70-g09d2 From b3329a33b5a3902e65c5517f41c374f5adb060e1 Mon Sep 17 00:00:00 2001 From: Shweta Gulati Date: Tue, 15 Feb 2011 13:40:30 +0530 Subject: OMAP2+: PM: SmartReflex: fix memory leaks in Smartreflex driver This Patch frees all the dynamically allocated memory which couldn't have been released in some error hitting cases. Signed-off-by: Shweta Gulati Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/smartreflex.c | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) (limited to 'arch/arm/mach-omap2/smartreflex.c') diff --git a/arch/arm/mach-omap2/smartreflex.c b/arch/arm/mach-omap2/smartreflex.c index 5a849c98173..1a777e34d0c 100644 --- a/arch/arm/mach-omap2/smartreflex.c +++ b/arch/arm/mach-omap2/smartreflex.c @@ -282,6 +282,7 @@ error: dev_err(&sr_info->pdev->dev, "%s: ERROR in registering" "interrupt handler. Smartreflex will" "not function as desired\n", __func__); + kfree(name); kfree(sr_info); return ret; } @@ -879,7 +880,7 @@ static int __init omap_sr_probe(struct platform_device *pdev) ret = sr_late_init(sr_info); if (ret) { pr_warning("%s: Error in SR late init\n", __func__); - return ret; + goto err_release_region; } } @@ -890,14 +891,17 @@ static int __init omap_sr_probe(struct platform_device *pdev) * not try to create rest of the debugfs entries. */ vdd_dbg_dir = omap_voltage_get_dbgdir(sr_info->voltdm); - if (!vdd_dbg_dir) - return -EINVAL; + if (!vdd_dbg_dir) { + ret = -EINVAL; + goto err_release_region; + } dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir); if (IS_ERR(dbg_dir)) { dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n", __func__); - return PTR_ERR(dbg_dir); + ret = PTR_ERR(dbg_dir); + goto err_release_region; } (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, dbg_dir, @@ -913,7 +917,8 @@ static int __init omap_sr_probe(struct platform_device *pdev) if (IS_ERR(nvalue_dir)) { dev_err(&pdev->dev, "%s: Unable to create debugfs directory" "for n-values\n", __func__); - return PTR_ERR(nvalue_dir); + ret = PTR_ERR(nvalue_dir); + goto err_release_region; } omap_voltage_get_volttable(sr_info->voltdm, &volt_data); @@ -922,7 +927,8 @@ static int __init omap_sr_probe(struct platform_device *pdev) " corresponding vdd vdd_%s. Cannot create debugfs" "entries for n-values\n", __func__, sr_info->voltdm->name); - return -ENODATA; + ret = -ENODATA; + goto err_release_region; } for (i = 0; i < sr_info->nvalue_count; i++) { -- cgit v1.2.3-70-g09d2 From 5c56f32e80ac8ea9878a0a5eb9ca99c703e953ab Mon Sep 17 00:00:00 2001 From: Vasiliy Kulikov Date: Wed, 19 Jan 2011 15:57:22 +0300 Subject: OMAP: PM: SmartReflex: fix potential NULL dereference kzalloc() may fail, if so return -ENOMEM. Also Walter Harms suggested to use kasprintf() instead of kzalloc+strcpy+strcat. Signed-off-by: Vasiliy Kulikov Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/smartreflex.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'arch/arm/mach-omap2/smartreflex.c') diff --git a/arch/arm/mach-omap2/smartreflex.c b/arch/arm/mach-omap2/smartreflex.c index 1a777e34d0c..b57ae502e0c 100644 --- a/arch/arm/mach-omap2/smartreflex.c +++ b/arch/arm/mach-omap2/smartreflex.c @@ -260,9 +260,11 @@ static int sr_late_init(struct omap_sr *sr_info) if (sr_class->class_type == SR_CLASS2 && sr_class->notify_flags && sr_info->irq) { - name = kzalloc(SMARTREFLEX_NAME_LEN + 1, GFP_KERNEL); - strcpy(name, "sr_"); - strcat(name, sr_info->voltdm->name); + name = kasprintf(GFP_KERNEL, "sr_%s", sr_info->voltdm->name); + if (name == NULL) { + ret = -ENOMEM; + goto error; + } ret = request_irq(sr_info->irq, sr_interrupt, 0, name, (void *)sr_info); if (ret) -- cgit v1.2.3-70-g09d2 From b1ace38094c4926255343a81faba8fb4faf59a45 Mon Sep 17 00:00:00 2001 From: Anand S Sawant Date: Thu, 17 Feb 2011 21:27:30 +0530 Subject: OMAP2+: smartreflex: remove SR debug directory in omap_sr_remove() omap_sr_probe() creates the smartreflex debug directory and its underlying nvalue debug directory. These directories are removed in omap_sr_remove(). Basic smartreflex functionality tested on OMAP3630 Zoom3 & OMAP4430 SDP Signed-off-by: Anand S Sawant Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/smartreflex.c | 23 +++++++++++++---------- 1 file changed, 13 insertions(+), 10 deletions(-) (limited to 'arch/arm/mach-omap2/smartreflex.c') diff --git a/arch/arm/mach-omap2/smartreflex.c b/arch/arm/mach-omap2/smartreflex.c index b57ae502e0c..0ab4dd5081e 100644 --- a/arch/arm/mach-omap2/smartreflex.c +++ b/arch/arm/mach-omap2/smartreflex.c @@ -54,6 +54,7 @@ struct omap_sr { struct list_head node; struct omap_sr_nvalue_table *nvalue_table; struct voltagedomain *voltdm; + struct dentry *dbg_dir; }; /* sr_list contains all the instances of smartreflex module */ @@ -823,7 +824,7 @@ static int __init omap_sr_probe(struct platform_device *pdev) struct omap_sr *sr_info = kzalloc(sizeof(struct omap_sr), GFP_KERNEL); struct omap_sr_data *pdata = pdev->dev.platform_data; struct resource *mem, *irq; - struct dentry *vdd_dbg_dir, *dbg_dir, *nvalue_dir; + struct dentry *vdd_dbg_dir, *nvalue_dir; struct omap_volt_data *volt_data; int i, ret = 0; @@ -898,24 +899,24 @@ static int __init omap_sr_probe(struct platform_device *pdev) goto err_release_region; } - dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir); - if (IS_ERR(dbg_dir)) { + sr_info->dbg_dir = debugfs_create_dir("smartreflex", vdd_dbg_dir); + if (IS_ERR(sr_info->dbg_dir)) { dev_err(&pdev->dev, "%s: Unable to create debugfs directory\n", __func__); - ret = PTR_ERR(dbg_dir); + ret = PTR_ERR(sr_info->dbg_dir); goto err_release_region; } - (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, dbg_dir, - (void *)sr_info, &pm_sr_fops); - (void) debugfs_create_x32("errweight", S_IRUGO, dbg_dir, + (void) debugfs_create_file("autocomp", S_IRUGO | S_IWUSR, + sr_info->dbg_dir, (void *)sr_info, &pm_sr_fops); + (void) debugfs_create_x32("errweight", S_IRUGO, sr_info->dbg_dir, &sr_info->err_weight); - (void) debugfs_create_x32("errmaxlimit", S_IRUGO, dbg_dir, + (void) debugfs_create_x32("errmaxlimit", S_IRUGO, sr_info->dbg_dir, &sr_info->err_maxlimit); - (void) debugfs_create_x32("errminlimit", S_IRUGO, dbg_dir, + (void) debugfs_create_x32("errminlimit", S_IRUGO, sr_info->dbg_dir, &sr_info->err_minlimit); - nvalue_dir = debugfs_create_dir("nvalue", dbg_dir); + nvalue_dir = debugfs_create_dir("nvalue", sr_info->dbg_dir); if (IS_ERR(nvalue_dir)) { dev_err(&pdev->dev, "%s: Unable to create debugfs directory" "for n-values\n", __func__); @@ -972,6 +973,8 @@ static int __devexit omap_sr_remove(struct platform_device *pdev) if (sr_info->autocomp_active) sr_stop_vddautocomp(sr_info); + if (sr_info->dbg_dir) + debugfs_remove_recursive(sr_info->dbg_dir); list_del(&sr_info->node); iounmap(sr_info->base); -- cgit v1.2.3-70-g09d2