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authorAlan Stern <stern@rowland.harvard.edu>2007-03-15 15:50:34 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-03-15 18:29:26 -0400
commitd9a9cdfb078d755e648d53ec25b7370f84ee5729 (patch)
tree308380483fd6241b1d0ef5916b9329c1c5df00f6 /drivers/scsi/scsi_sysfs.c
parent6ab27c6bf38d5ff71dafeca77b79e7c284804b75 (diff)
[PATCH] sysfs and driver core: add callback helper, used by SCSI and S390
This patch (as868) adds a helper routine for device drivers that need to set up a callback to perform some action in a different process's context. This is intended for use by attribute methods that want to unregister themselves or their parent device. Attribute method calls are mutually exclusive with unregistration, so such actions cannot be taken directly. Two attribute methods are converted to use the new helper routine: one for SCSI device deletion and one for System/390 ccwgroup devices. Signed-off-by: Alan Stern <stern@rowland.harvard.edu> Cc: Hugh Dickins <hugh@veritas.com> Cc: Cornelia Huck <cornelia.huck@de.ibm.com> Cc: Oliver Neukum <oneukum@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/scsi/scsi_sysfs.c')
-rw-r--r--drivers/scsi/scsi_sysfs.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/scsi/scsi_sysfs.c b/drivers/scsi/scsi_sysfs.c
index c275dcac3f18..939de0de18bc 100644
--- a/drivers/scsi/scsi_sysfs.c
+++ b/drivers/scsi/scsi_sysfs.c
@@ -452,10 +452,22 @@ store_rescan_field (struct device *dev, struct device_attribute *attr, const cha
452} 452}
453static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field); 453static DEVICE_ATTR(rescan, S_IWUSR, NULL, store_rescan_field);
454 454
455static void sdev_store_delete_callback(struct device *dev)
456{
457 scsi_remove_device(to_scsi_device(dev));
458}
459
455static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf, 460static ssize_t sdev_store_delete(struct device *dev, struct device_attribute *attr, const char *buf,
456 size_t count) 461 size_t count)
457{ 462{
458 scsi_remove_device(to_scsi_device(dev)); 463 int rc;
464
465 /* An attribute cannot be unregistered by one of its own methods,
466 * so we have to use this roundabout approach.
467 */
468 rc = device_schedule_callback(dev, sdev_store_delete_callback);
469 if (rc)
470 count = rc;
459 return count; 471 return count;
460}; 472};
461static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete); 473static DEVICE_ATTR(delete, S_IWUSR, NULL, sdev_store_delete);