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ipmi: proper spinlock initialization
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@gmail.com> Acked-by: David Miller <davem@davemloft.net> Cc: Yinghai Lu <yinghai@kernel.org> Acked-by: Corey Minyard <cminyard@mvista.com> Cc: <stable@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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parent
1f9fa5216e
commit
de5e2ddf9b
1 changed files with 19 additions and 11 deletions
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@ -1665,6 +1665,17 @@ static int check_hotmod_int_op(const char *curr, const char *option,
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return 0;
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}
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static struct smi_info *smi_info_alloc(void)
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{
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struct smi_info *info = kzalloc(sizeof(*info), GFP_KERNEL);
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if (info) {
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spin_lock_init(&info->si_lock);
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spin_lock_init(&info->msg_lock);
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}
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return info;
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}
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static int hotmod_handler(const char *val, struct kernel_param *kp)
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{
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char *str = kstrdup(val, GFP_KERNEL);
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@ -1779,7 +1790,7 @@ static int hotmod_handler(const char *val, struct kernel_param *kp)
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}
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if (op == HM_ADD) {
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = smi_info_alloc();
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if (!info) {
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rv = -ENOMEM;
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goto out;
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@ -1844,7 +1855,7 @@ static __devinit void hardcode_find_bmc(void)
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if (!ports[i] && !addrs[i])
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continue;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = smi_info_alloc();
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if (!info)
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return;
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@ -2027,7 +2038,7 @@ static __devinit int try_init_spmi(struct SPMITable *spmi)
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return -ENODEV;
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}
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = smi_info_alloc();
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if (!info) {
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printk(KERN_ERR PFX "Could not allocate SI data (3)\n");
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return -ENOMEM;
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@ -2137,7 +2148,7 @@ static int __devinit ipmi_pnp_probe(struct pnp_dev *dev,
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if (!acpi_dev)
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return -ENODEV;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = smi_info_alloc();
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if (!info)
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return -ENOMEM;
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@ -2318,7 +2329,7 @@ static __devinit void try_init_dmi(struct dmi_ipmi_data *ipmi_data)
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{
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struct smi_info *info;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = smi_info_alloc();
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if (!info) {
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printk(KERN_ERR PFX "Could not allocate SI data\n");
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return;
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@ -2425,7 +2436,7 @@ static int __devinit ipmi_pci_probe(struct pci_dev *pdev,
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int class_type = pdev->class & PCI_ERMC_CLASSCODE_TYPE_MASK;
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struct smi_info *info;
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = smi_info_alloc();
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if (!info)
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return -ENOMEM;
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@ -2566,7 +2577,7 @@ static int __devinit ipmi_of_probe(struct platform_device *dev,
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return -EINVAL;
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}
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = smi_info_alloc();
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if (!info) {
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dev_err(&dev->dev,
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@ -3013,7 +3024,7 @@ static __devinit void default_find_bmc(void)
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if (check_legacy_ioport(ipmi_defaults[i].port))
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continue;
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#endif
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info = kzalloc(sizeof(*info), GFP_KERNEL);
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info = smi_info_alloc();
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if (!info)
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return;
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@ -3138,9 +3149,6 @@ static int try_smi_init(struct smi_info *new_smi)
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goto out_err;
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}
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spin_lock_init(&(new_smi->si_lock));
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spin_lock_init(&(new_smi->msg_lock));
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/* Do low-level detection first. */
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if (new_smi->handlers->detect(new_smi->si_sm)) {
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if (new_smi->addr_source)
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