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Date: Thu, 03 Sep 2015 16:01:55 +0200
From: Johannes Thumshirn <jthumshirn@...e.de>
To: Charles Chiou <ch1102chiou@...il.com>
Cc: Christoph Hellwig <hch@...radead.org>, JBottomley@...allels.com,
Oliver Neukum <oneukum@...e.de>, grace.chang@...promise.com,
linus.chen@...promise.com, victor.p@...mise.com,
linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [v2 PATCH 2/3] scsi:stex.c Add hotplug support
Charles Chiou <ch1102chiou@...il.com> writes:
> From 60e14c245c18cbe0300cfa244334e2850a52a381 Mon Sep 17 00:00:00 2001
> From: Charles <charles.chiou@...promise.com>
> Date: Wed, 2 Sep 2015 20:48:55 +0800
> Subject: [PATCH 2/3] scsi:stex.c Add hotplug support
>
> 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.
>
> V2: N/A
>
> Signed-off-by: Charles Chiou <charles.chiou@...promise.com>
> ---
> drivers/scsi/stex.c | 53 ++++++++++++++++++++++++++++++++++-------------------
> 1 file changed, 34 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/scsi/stex.c b/drivers/scsi/stex.c
> index 0c93f1f..4ef0c80 100644
> --- a/drivers/scsi/stex.c
> +++ b/drivers/scsi/stex.c
> @@ -83,6 +83,8 @@ 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,
> @@ -544,6 +546,27 @@ 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)
> {
> @@ -567,8 +590,12 @@ 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]) {
> @@ -1267,10 +1294,8 @@ 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) {
> @@ -1304,20 +1329,8 @@ 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;
> @@ -1786,9 +1799,11 @@ 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);
Looks OK to me, so
Reviewed-by: Johannes Thumshirn <jthumshirn@...e.de>
--
Johannes Thumshirn Storage
jthumshirn@...e.de +49 911 74053 689
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Felix Imendörffer, Jane Smithard, Graham Norton
HRB 21284 (AG Nürnberg)
Key fingerprint = EC38 9CAB C2C4 F25D 8600 D0D0 0393 969D 2D76 0850
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