From 22834ed6cec2690817120e960d43bbf76ddfda17 Mon Sep 17 00:00:00 2001 From: Xiang Chen Date: Fri, 9 Nov 2018 22:06:35 +0800 Subject: [PATCH 13/31] scsi: hisi_sas: Relocate some codes to avoid an unused check Origin: https://git.kernel.org/linus/745b6847634c11dda1079d0290781a443eddb4b7 In function hisi_sas_task_prep(), we check asd_sas_port, but in function hisi_sas_task_exec(), we already refer to asd_sas_port by using function dev_to_hisi_hba() implicitly. So to avoid this possible invalid dereference, relocate the check to function hisi_sas_task_prep(). Signed-off-by: Xiang Chen Signed-off-by: John Garry Signed-off-by: Martin K. Petersen --- drivers/scsi/hisi_sas/hisi_sas_main.c | 44 ++++++++++++++------------- 1 file changed, 23 insertions(+), 21 deletions(-) Index: linux/drivers/scsi/hisi_sas/hisi_sas_main.c =================================================================== --- linux.orig/drivers/scsi/hisi_sas/hisi_sas_main.c +++ linux/drivers/scsi/hisi_sas/hisi_sas_main.c @@ -303,36 +303,19 @@ static int hisi_sas_task_prep(struct sas int *pass) { struct domain_device *device = task->dev; - struct hisi_hba *hisi_hba; + struct hisi_hba *hisi_hba = dev_to_hisi_hba(device); struct hisi_sas_device *sas_dev = device->lldd_dev; struct hisi_sas_port *port; struct hisi_sas_slot *slot; struct hisi_sas_cmd_hdr *cmd_hdr_base; struct asd_sas_port *sas_port = device->port; - struct device *dev; + struct device *dev = hisi_hba->dev; int dlvry_queue_slot, dlvry_queue, rc, slot_idx; int n_elem = 0, n_elem_req = 0, n_elem_resp = 0; struct hisi_sas_dq *dq; unsigned long flags; int wr_q_index; - if (!sas_port) { - struct task_status_struct *ts = &task->task_status; - - ts->resp = SAS_TASK_UNDELIVERED; - ts->stat = SAS_PHY_DOWN; - /* - * libsas will use dev->port, should - * not call task_done for sata - */ - if (device->dev_type != SAS_SATA_DEV) - task->task_done(task); - return -ECOMM; - } - - hisi_hba = dev_to_hisi_hba(device); - dev = hisi_hba->dev; - if (DEV_IS_GONE(sas_dev)) { if (sas_dev) dev_info(dev, "task prep: device %d not ready\n", @@ -507,10 +490,29 @@ static int hisi_sas_task_exec(struct sas u32 rc; u32 pass = 0; unsigned long flags; - struct hisi_hba *hisi_hba = dev_to_hisi_hba(task->dev); - struct device *dev = hisi_hba->dev; + struct hisi_hba *hisi_hba; + struct device *dev; + struct domain_device *device = task->dev; + struct asd_sas_port *sas_port = device->port; struct hisi_sas_dq *dq = NULL; + if (!sas_port) { + struct task_status_struct *ts = &task->task_status; + + ts->resp = SAS_TASK_UNDELIVERED; + ts->stat = SAS_PHY_DOWN; + /* + * libsas will use dev->port, should + * not call task_done for sata + */ + if (device->dev_type != SAS_SATA_DEV) + task->task_done(task); + return -ECOMM; + } + + hisi_hba = dev_to_hisi_hba(device); + dev = hisi_hba->dev; + if (unlikely(test_bit(HISI_SAS_REJECT_CMD_BIT, &hisi_hba->flags))) { if (in_softirq()) return -EINVAL;