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authorKleber Sacilotto de Souza <klebers@linux.vnet.ibm.com>2011-02-14 20:19:31 -0200
committerJames Bottomley <James.Bottomley@suse.de>2011-02-18 12:29:15 -0600
commit5767a1c498931417e69e663ddd5e110cbaabec32 (patch)
tree5d972d656b7d82fdad0356a09231094562a2a4f6 /drivers/scsi/ipr.c
parentc299190b9398d4edfbf80a749875d5bac199bfdc (diff)
[SCSI] ipr: Fix a race on multiple configuration changes
In a multiple configuration change scenario a remove notification can be followed by an immediate add notification for the same device, which will cause the device to be removed but never added back. This patch fixes the problem by ensuring that in such situations the device will be added back. Signed-off-by: Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com> Acked-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/ipr.c')
-rw-r--r--drivers/scsi/ipr.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index a8e24f06b8d..14857679f4e 100644
--- a/drivers/scsi/ipr.c
+++ b/drivers/scsi/ipr.c
@@ -1301,7 +1301,7 @@ static void ipr_handle_config_change(struct ipr_ioa_cfg *ioa_cfg,
ipr_clear_res_target(res);
list_move_tail(&res->queue, &ioa_cfg->free_res_q);
}
- } else if (!res->sdev) {
+ } else if (!res->sdev || res->del_from_ml) {
res->add_to_ml = 1;
if (ioa_cfg->allow_ml_add_del)
schedule_work(&ioa_cfg->work_q);
@@ -3104,7 +3104,10 @@ restart:
did_work = 1;
sdev = res->sdev;
if (!scsi_device_get(sdev)) {
- list_move_tail(&res->queue, &ioa_cfg->free_res_q);
+ if (!res->add_to_ml)
+ list_move_tail(&res->queue, &ioa_cfg->free_res_q);
+ else
+ res->del_from_ml = 0;
spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags);
scsi_remove_device(sdev);
scsi_device_put(sdev);