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| author | Kleber Sacilotto de Souza <klebers@linux.vnet.ibm.com> | 2011-02-14 20:19:31 -0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2011-02-18 12:29:15 -0600 |
| commit | 5767a1c498931417e69e663ddd5e110cbaabec32 (patch) | |
| tree | 5d972d656b7d82fdad0356a09231094562a2a4f6 | |
| parent | c299190b9398d4edfbf80a749875d5bac199bfdc (diff) | |
| download | linux-3.10-5767a1c498931417e69e663ddd5e110cbaabec32.tar.gz linux-3.10-5767a1c498931417e69e663ddd5e110cbaabec32.tar.bz2 linux-3.10-5767a1c498931417e69e663ddd5e110cbaabec32.zip | |
[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>
| -rw-r--r-- | drivers/scsi/ipr.c | 7 |
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); |