diff options
| author | Paul Mundt <lethal@linux-sh.org> | 2010-05-24 08:52:55 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2010-05-24 08:52:55 +0900 |
| commit | 1f782fee18b39b9ad438ebbd82c2915a16c879ee (patch) | |
| tree | f292930065e6c860714c134790ab8882680ac739 /kernel/resource.c | |
| parent | 8eda2f21ed9c936a54fd7bc16cbfa5ee656635c2 (diff) | |
| parent | f4b87dee923342505e1ddba8d34ce9de33e75050 (diff) | |
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'kernel/resource.c')
| -rw-r--r-- | kernel/resource.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/resource.c b/kernel/resource.c index 9c358e26353..7b36976e5de 100644 --- a/kernel/resource.c +++ b/kernel/resource.c @@ -15,6 +15,7 @@ #include <linux/spinlock.h> #include <linux/fs.h> #include <linux/proc_fs.h> +#include <linux/sched.h> #include <linux/seq_file.h> #include <linux/device.h> #include <linux/pfn.h> @@ -681,6 +682,8 @@ resource_size_t resource_alignment(struct resource *res) * release_region releases a matching busy region. */ +static DECLARE_WAIT_QUEUE_HEAD(muxed_resource_wait); + /** * __request_region - create a new busy resource region * @parent: parent resource descriptor @@ -693,6 +696,7 @@ struct resource * __request_region(struct resource *parent, resource_size_t start, resource_size_t n, const char *name, int flags) { + DECLARE_WAITQUEUE(wait, current); struct resource *res = kzalloc(sizeof(*res), GFP_KERNEL); if (!res) @@ -717,7 +721,15 @@ struct resource * __request_region(struct resource *parent, if (!(conflict->flags & IORESOURCE_BUSY)) continue; } - + if (conflict->flags & flags & IORESOURCE_MUXED) { + add_wait_queue(&muxed_resource_wait, &wait); + write_unlock(&resource_lock); + set_current_state(TASK_UNINTERRUPTIBLE); + schedule(); + remove_wait_queue(&muxed_resource_wait, &wait); + write_lock(&resource_lock); + continue; + } /* Uhhuh, that didn't work out.. */ kfree(res); res = NULL; @@ -791,6 +803,8 @@ void __release_region(struct resource *parent, resource_size_t start, break; *p = res->sibling; write_unlock(&resource_lock); + if (res->flags & IORESOURCE_MUXED) + wake_up(&muxed_resource_wait); kfree(res); return; } |