The patch titled ipmi: proper spinlock initialization has been added to the -mm tree. Its filename is ipmi-proper-spinlocks-initializations.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: ipmi: proper spinlock initialization From: Eric Dumazet <eric.dumazet@xxxxxxxxx> Unloading ipmi module can trigger following error. (if CONFIG_DEBUG_SPINLOCK=y) [ 9633.779590] BUG: spinlock bad magic on CPU#1, rmmod/7170 [ 9633.779606] lock: f41f5414, .magic: 00000000, .owner: <none>/-1, .owner_cpu: 0 [ 9633.779626] Pid: 7170, comm: rmmod Not tainted 2.6.36-rc7-11474-gb71eb1e-dirty #328 [ 9633.779644] Call Trace: [ 9633.779657] [<c13921cc>] ? printk+0x18/0x1c [ 9633.779672] [<c11a1f33>] spin_bug+0xa3/0xf0 [ 9633.779685] [<c11a1ffd>] do_raw_spin_lock+0x7d/0x160 [ 9633.779702] [<c1131537>] ? release_sysfs_dirent+0x47/0xb0 [ 9633.779718] [<c1131b78>] ? sysfs_addrm_finish+0xa8/0xd0 [ 9633.779734] [<c1394bac>] _raw_spin_lock_irqsave+0xc/0x20 [ 9633.779752] [<f99d93da>] cleanup_one_si+0x6a/0x200 [ipmi_si] [ 9633.779768] [<c11305b2>] ? sysfs_hash_and_remove+0x72/0x80 [ 9633.779786] [<f99dcf26>] ipmi_pnp_remove+0xd/0xf [ipmi_si] [ 9633.779802] [<c11f622b>] pnp_device_remove+0x1b/0x40 Fix this by initializing spinlocks in a smi_info_alloc() helper function, right after memory allocation and clearing. Signed-off-by: Eric Dumazet <eric.dumazet@xxxxxxxxx> Acked-by: David Miller <davem@xxxxxxxxxxxxx> Cc: Yinghai Lu <yinghai@xxxxxxxxxx> Acked-by: Corey Minyard <cminyard@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/char/ipmi/ipmi_si_intf.c | 30 ++++++++++++++++++----------- 1 file changed, 19 insertions(+), 11 deletions(-) diff -puN drivers/char/ipmi/ipmi_si_intf.c~ipmi-proper-spinlocks-initializations drivers/char/ipmi/ipmi_si_intf.c --- a/drivers/char/ipmi/ipmi_si_intf.c~ipmi-proper-spinlocks-initializations +++ a/drivers/char/ipmi/ipmi_si_intf.c @@ -1665,6 +1665,17 @@ static int check_hotmod_int_op(const cha return 0; } +static struct smi_info *smi_info_alloc(void) +{ + struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL); + + if (info) { + spin_lock_init(&info->si_lock); + spin_lock_init(&info->msg_lock); + } + return info; +} + static int hotmod_handler(const char *val, struct kernel_param *kp) { char *str = kstrdup(val, GFP_KERNEL); @@ -1779,7 +1790,7 @@ static int hotmod_handler(const char *va } if (op == HM_ADD) { - info = kzalloc(sizeof(*info), GFP_KERNEL); + info = smi_info_alloc(); if (!info) { rv = -ENOMEM; goto out; @@ -1844,7 +1855,7 @@ static __devinit void hardcode_find_bmc( if (!ports[i] && !addrs[i]) continue; - info = kzalloc(sizeof(*info), GFP_KERNEL); + info = smi_info_alloc(); if (!info) return; @@ -2028,7 +2039,7 @@ static __devinit int try_init_spmi(struc return -ENODEV; } - info = kzalloc(sizeof(*info), GFP_KERNEL); + info = smi_info_alloc(); if (!info) { printk(KERN_ERR PFX "Could not allocate SI data (3)\n"); return -ENOMEM; @@ -2138,7 +2149,7 @@ static int __devinit ipmi_pnp_probe(stru if (!acpi_dev) return -ENODEV; - info = kzalloc(sizeof(*info), GFP_KERNEL); + info = smi_info_alloc(); if (!info) return -ENOMEM; @@ -2319,7 +2330,7 @@ static __devinit void try_init_dmi(struc { struct smi_info *info; - info = kzalloc(sizeof(*info), GFP_KERNEL); + info = smi_info_alloc(); if (!info) { printk(KERN_ERR PFX "Could not allocate SI data\n"); return; @@ -2426,7 +2437,7 @@ static int __devinit ipmi_pci_probe(stru int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK; struct smi_info *info; - info = kzalloc(sizeof(*info), GFP_KERNEL); + info = smi_info_alloc(); if (!info) return -ENOMEM; @@ -2567,7 +2578,7 @@ static int __devinit ipmi_of_probe(struc return -EINVAL; } - info = kzalloc(sizeof(*info), GFP_KERNEL); + info = smi_info_alloc(); if (!info) { dev_err(&dev->dev, @@ -3014,7 +3025,7 @@ static __devinit void default_find_bmc(v if (check_legacy_ioport(ipmi_defaults[i].port)) continue; #endif - info = kzalloc(sizeof(*info), GFP_KERNEL); + info = smi_info_alloc(); if (!info) return; @@ -3139,9 +3150,6 @@ static int try_smi_init(struct smi_info goto out_err; } - spin_lock_init(&(new_smi->si_lock)); - spin_lock_init(&(new_smi->msg_lock)); - /* Do low-level detection first. */ if (new_smi->handlers->detect(new_smi->si_sm)) { if (new_smi->addr_source) _ Patches currently in -mm which might be from eric.dumazet@xxxxxxxxx are origin.patch ipmi-proper-spinlocks-initializations.patch linux-next.patch net-avoid-limits-overflow.patch fs-allow-for-more-than-231-files.patch percpu_counter-use-this_cpu_ptr-instead-of-per_cpu_ptr.patch signals-annotate-lock_task_sighand.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html