OMAP3: PM: introduce a new powerdomain walk helper
The 'pwrdm_for_each()' function walks powerdomains with a spinlock locked, so the the callbacks cannot do anything which may sleep. This patch introduces a 'pwrdm_for_each_nolock()' helper which does the same, but without the spinlock locked. This fixes the following lockdep warning: [ 0.000000] WARNING: at kernel/lockdep.c:2460 lockdep_trace_alloc+0xac/0xec() [ 0.000000] Modules linked in: (unwind_backtrace+0x0/0xdc) from [<c0045464>] (warn_slowpath_common+0x48/0x60) (warn_slowpath_common+0x48/0x60) from [<c0067dd4>] (lockdep_trace_alloc+0xac/0xec) (lockdep_trace_alloc+0xac/0xec) from [<c009da14>] (kmem_cache_alloc+0x1c/0xd0) (kmem_cache_alloc+0x1c/0xd0) from [<c00b21d8>] (d_alloc+0x1c/0x1a4) (d_alloc+0x1c/0x1a4) from [<c00a887c>] (__lookup_hash+0xd8/0x118) (__lookup_hash+0xd8/0x118) from [<c00a9f20>] (lookup_one_len+0x84/0x94) (lookup_one_len+0x84/0x94) from [<c010d12c>] (debugfs_create_file+0x8c/0x20c) (debugfs_create_file+0x8c/0x20c) from [<c010d320>] (debugfs_create_dir+0x1c/0x20) (debugfs_create_dir+0x1c/0x20) from [<c000e8cc>] (pwrdms_setup+0x60/0x90) (pwrdms_setup+0x60/0x90) from [<c002e010>] (pwrdm_for_each+0x30/0x80) (pwrdm_for_each+0x30/0x80) from [<c000e79c>] (pm_dbg_init+0x7c/0x14c) (pm_dbg_init+0x7c/0x14c) from [<c00232b4>] (do_one_initcall+0x5c/0x1b8) (do_one_initcall+0x5c/0x1b8) from [<c00083f8>] (kernel_init+0x90/0x10c) (kernel_init+0x90/0x10c) from [<c00242c4>] (kernel_thread_exit+0x0/0x8) Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com> Signed-off-by: Kevin Hilman <khilman@deeprootsystems.com>
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@ -551,7 +551,7 @@ static int __init pm_dbg_init(void)
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(void) debugfs_create_file("time", S_IRUGO,
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d, (void *)DEBUG_FILE_TIMERS, &debug_fops);
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pwrdm_for_each(pwrdms_setup, (void *)d);
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pwrdm_for_each_nolock(pwrdms_setup, (void *)d);
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pm_dbg_dir = debugfs_create_dir("registers", d);
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if (IS_ERR(pm_dbg_dir))
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@ -273,35 +273,50 @@ struct powerdomain *pwrdm_lookup(const char *name)
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}
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/**
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* pwrdm_for_each - call function on each registered clockdomain
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* pwrdm_for_each_nolock - call function on each registered clockdomain
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* @fn: callback function *
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*
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* Call the supplied function for each registered powerdomain. The
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* callback function can return anything but 0 to bail out early from
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* the iterator. The callback function is called with the pwrdm_rwlock
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* held for reading, so no powerdomain structure manipulation
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* functions should be called from the callback, although hardware
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* powerdomain control functions are fine. Returns the last return
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* value of the callback function, which should be 0 for success or
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* anything else to indicate failure; or -EINVAL if the function
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* pointer is null.
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* the iterator. Returns the last return value of the callback function, which
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* should be 0 for success or anything else to indicate failure; or -EINVAL if
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* the function pointer is null.
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*/
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int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
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int pwrdm_for_each_nolock(int (*fn)(struct powerdomain *pwrdm, void *user),
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void *user)
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{
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struct powerdomain *temp_pwrdm;
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unsigned long flags;
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int ret = 0;
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if (!fn)
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return -EINVAL;
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read_lock_irqsave(&pwrdm_rwlock, flags);
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list_for_each_entry(temp_pwrdm, &pwrdm_list, node) {
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ret = (*fn)(temp_pwrdm, user);
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if (ret)
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break;
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}
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return ret;
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}
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/**
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* pwrdm_for_each - call function on each registered clockdomain
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* @fn: callback function *
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*
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* This function is the same as 'pwrdm_for_each_nolock()', but keeps the
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* &pwrdm_rwlock locked for reading, so no powerdomain structure manipulation
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* functions should be called from the callback, although hardware powerdomain
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* control functions are fine.
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*/
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int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
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void *user)
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{
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unsigned long flags;
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int ret;
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read_lock_irqsave(&pwrdm_rwlock, flags);
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ret = pwrdm_for_each_nolock(fn, user);
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read_unlock_irqrestore(&pwrdm_rwlock, flags);
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return ret;
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@ -135,6 +135,8 @@ struct powerdomain *pwrdm_lookup(const char *name);
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int pwrdm_for_each(int (*fn)(struct powerdomain *pwrdm, void *user),
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void *user);
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int pwrdm_for_each_nolock(int (*fn)(struct powerdomain *pwrdm, void *user),
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void *user);
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int pwrdm_add_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
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int pwrdm_del_clkdm(struct powerdomain *pwrdm, struct clockdomain *clkdm);
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