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author | Paul Mackerras <paulus@samba.org> | 2006-02-24 14:05:47 +1100 |
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committer | Paul Mackerras <paulus@samba.org> | 2006-02-24 14:05:47 +1100 |
commit | a00428f5b149e36b8225b2a0812742a6dfb07b8c (patch) | |
tree | a78869cd67cf78a0eb091fb0ea5d397734bd6738 /drivers/scsi/scsi_lib.c | |
parent | 774fee58c465ea1c7e9775e347ec307bcf2deeb3 (diff) | |
parent | fb5c594c2acc441f0d2d8f457484a0e0e9285db3 (diff) | |
download | op-kernel-dev-a00428f5b149e36b8225b2a0812742a6dfb07b8c.zip op-kernel-dev-a00428f5b149e36b8225b2a0812742a6dfb07b8c.tar.gz |
Merge ../powerpc-merge
Diffstat (limited to 'drivers/scsi/scsi_lib.c')
-rw-r--r-- | drivers/scsi/scsi_lib.c | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c index 4a60285..4362dcd 100644 --- a/drivers/scsi/scsi_lib.c +++ b/drivers/scsi/scsi_lib.c @@ -16,6 +16,7 @@ #include <linux/init.h> #include <linux/pci.h> #include <linux/delay.h> +#include <linux/hardirq.h> #include <scsi/scsi.h> #include <scsi/scsi_dbg.h> @@ -2248,3 +2249,61 @@ scsi_target_unblock(struct device *dev) device_for_each_child(dev, NULL, target_unblock); } EXPORT_SYMBOL_GPL(scsi_target_unblock); + + +struct work_queue_work { + struct work_struct work; + void (*fn)(void *); + void *data; +}; + +static void execute_in_process_context_work(void *data) +{ + void (*fn)(void *data); + struct work_queue_work *wqw = data; + + fn = wqw->fn; + data = wqw->data; + + kfree(wqw); + + fn(data); +} + +/** + * scsi_execute_in_process_context - reliably execute the routine with user context + * @fn: the function to execute + * @data: data to pass to the function + * + * Executes the function immediately if process context is available, + * otherwise schedules the function for delayed execution. + * + * Returns: 0 - function was executed + * 1 - function was scheduled for execution + * <0 - error + */ +int scsi_execute_in_process_context(void (*fn)(void *data), void *data) +{ + struct work_queue_work *wqw; + + if (!in_interrupt()) { + fn(data); + return 0; + } + + wqw = kmalloc(sizeof(struct work_queue_work), GFP_ATOMIC); + + if (unlikely(!wqw)) { + printk(KERN_ERR "Failed to allocate memory\n"); + WARN_ON(1); + return -ENOMEM; + } + + INIT_WORK(&wqw->work, execute_in_process_context_work, wqw); + wqw->fn = fn; + wqw->data = data; + schedule_work(&wqw->work); + + return 1; +} +EXPORT_SYMBOL_GPL(scsi_execute_in_process_context); |