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stex: Add hotplug support

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1. Add hotplug support. Pegasus support surprise removal. To this end, I
   use return_abnormal_state function to return DID_NO_CONNECT for all
   commands which sent to driver.

2. Remove stex_hba_stop in stex_remove because we cannot send command to
   device after hotplug.

3. Add new device status: MU_STATE_STOP, MU_STATE_NOCONNECT,
   MU_STATE_STOP. MU_STATE_STOP is currently not referenced.
   MU_STATE_NOCONNECT represent that device is plugged out from the
   host.

4. Use return_abnormal_function() to substitute part of code in
   stex_do_reset.

Signed-off-by: Charles Chiou <charles.chiou@tw.promise.com>
Reviewed-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Charles 2016-02-22 20:04:25 +08:00 committed by Martin K. Petersen
parent 1ec364e6a3
commit 45b42adbec
1 changed files with 34 additions and 19 deletions
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53
drivers/scsi/stex.c
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@ -84,6 +84,8 @@ enum {
MU_STATE_STARTED = 2,
MU_STATE_RESETTING = 3,
MU_STATE_FAILED = 4,
MU_STATE_STOP = 5,
MU_STATE_NOCONNECT = 6,
MU_MAX_DELAY = 120,
MU_HANDSHAKE_SIGNATURE = 0x55aaaa55,
@ -537,6 +539,27 @@ stex_ss_send_cmd(struct st_hba *hba, struct req_msg *req, u16 tag)
readl(hba->mmio_base + YH2I_REQ); /* flush */
}
static void return_abnormal_state(struct st_hba *hba, int status)
{
struct st_ccb *ccb;
unsigned long flags;
u16 tag;
spin_lock_irqsave(hba->host->host_lock, flags);
for (tag = 0; tag < hba->host->can_queue; tag++) {
ccb = &hba->ccb[tag];
if (ccb->req == NULL)
continue;
ccb->req = NULL;
if (ccb->cmd) {
scsi_dma_unmap(ccb->cmd);
ccb->cmd->result = status << 16;
ccb->cmd->scsi_done(ccb->cmd);
ccb->cmd = NULL;
}
}
spin_unlock_irqrestore(hba->host->host_lock, flags);
}
static int
stex_slave_config(struct scsi_device *sdev)
{
@ -560,8 +583,12 @@ stex_queuecommand_lck(struct scsi_cmnd *cmd, void (*done)(struct scsi_cmnd *))
id = cmd->device->id;
lun = cmd->device->lun;
hba = (struct st_hba *) &host->hostdata[0];
if (unlikely(hba->mu_status == MU_STATE_RESETTING))
if (hba->mu_status == MU_STATE_NOCONNECT) {
cmd->result = DID_NO_CONNECT;
done(cmd);
return 0;
}
if (unlikely(hba->mu_status != MU_STATE_STARTED))
return SCSI_MLQUEUE_HOST_BUSY;
switch (cmd->cmnd[0]) {
@ -1260,10 +1287,8 @@ static void stex_ss_reset(struct st_hba *hba)
static int stex_do_reset(struct st_hba *hba)
{
struct st_ccb *ccb;
unsigned long flags;
unsigned int mu_status = MU_STATE_RESETTING;
u16 tag;
spin_lock_irqsave(hba->host->host_lock, flags);
if (hba->mu_status == MU_STATE_STARTING) {
@ -1297,20 +1322,8 @@ static int stex_do_reset(struct st_hba *hba)
else if (hba->cardtype == st_yel)
stex_ss_reset(hba);
spin_lock_irqsave(hba->host->host_lock, flags);
for (tag = 0; tag < hba->host->can_queue; tag++) {
ccb = &hba->ccb[tag];
if (ccb->req == NULL)
continue;
ccb->req = NULL;
if (ccb->cmd) {
scsi_dma_unmap(ccb->cmd);
ccb->cmd->result = DID_RESET << 16;
ccb->cmd->scsi_done(ccb->cmd);
ccb->cmd = NULL;
}
}
spin_unlock_irqrestore(hba->host->host_lock, flags);
return_abnormal_state(hba, DID_RESET);
if (stex_handshake(hba) == 0)
return 0;
@ -1771,9 +1784,11 @@ static void stex_remove(struct pci_dev *pdev)
{
struct st_hba *hba = pci_get_drvdata(pdev);
hba->mu_status = MU_STATE_NOCONNECT;
return_abnormal_state(hba, DID_NO_CONNECT);
scsi_remove_host(hba->host);
stex_hba_stop(hba);
scsi_block_requests(hba->host);
stex_hba_free(hba);