From: Kleber Sacilotto de Souza Date: Mon, 14 Feb 2011 22:19:31 +0000 (-0200) Subject: [SCSI] ipr: Fix a race on multiple configuration changes X-Git-Tag: v2.6.39-rc1~440^2~88 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5767a1c498931417e69e663ddd5e110cbaabec32;p=karo-tx-linux.git [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 Acked-by: Brian King Signed-off-by: James Bottomley --- diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c index a8e24f06b8d8..14857679f4e9 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);