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synced 2024-08-27 19:29:37 +00:00
tcmu: fix double se_cmd completion
If cmd_time_out != 0, then tcmu_queue_cmd_ring could end up sleeping waiting for ring space, timing out and then returning failure to lio, and tcmu_check_expired_cmd could also detect the timeout and call target_complete_cmd on the cmd. This patch just delays setting up the deadline value and adding the cmd to the udev->commands idr until we have allocated ring space and are about to send the cmd to userspace. Signed-off-by: Mike Christie <mchristi@redhat.com> Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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parent
a271eac46a
commit
0d44374c1a
1 changed files with 31 additions and 23 deletions
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@ -432,7 +432,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
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struct se_device *se_dev = se_cmd->se_dev;
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struct tcmu_dev *udev = TCMU_DEV(se_dev);
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struct tcmu_cmd *tcmu_cmd;
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int cmd_id;
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tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL);
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if (!tcmu_cmd)
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@ -440,9 +439,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
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tcmu_cmd->se_cmd = se_cmd;
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tcmu_cmd->tcmu_dev = udev;
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if (udev->cmd_time_out)
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tcmu_cmd->deadline = jiffies +
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msecs_to_jiffies(udev->cmd_time_out);
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tcmu_cmd_reset_dbi_cur(tcmu_cmd);
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tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd);
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@ -453,19 +449,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
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return NULL;
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}
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idr_preload(GFP_KERNEL);
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spin_lock_irq(&udev->commands_lock);
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cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0,
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USHRT_MAX, GFP_NOWAIT);
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spin_unlock_irq(&udev->commands_lock);
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idr_preload_end();
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if (cmd_id < 0) {
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tcmu_free_cmd(tcmu_cmd);
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return NULL;
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}
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tcmu_cmd->cmd_id = cmd_id;
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return tcmu_cmd;
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}
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@ -748,6 +731,30 @@ static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd,
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return command_size;
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}
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static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd)
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{
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struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
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unsigned long tmo = udev->cmd_time_out;
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int cmd_id;
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if (tcmu_cmd->cmd_id)
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return 0;
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cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT);
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if (cmd_id < 0) {
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pr_err("tcmu: Could not allocate cmd id.\n");
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return cmd_id;
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}
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tcmu_cmd->cmd_id = cmd_id;
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if (!tmo)
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return 0;
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tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo));
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mod_timer(&udev->timeout, tcmu_cmd->deadline);
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return 0;
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}
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static sense_reason_t
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tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
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{
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@ -841,7 +848,6 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
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entry = (void *) mb + CMDR_OFF + cmd_head;
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memset(entry, 0, command_size);
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tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD);
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entry->hdr.cmd_id = tcmu_cmd->cmd_id;
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/* Handle allocating space from the data area */
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tcmu_cmd_reset_dbi_cur(tcmu_cmd);
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@ -879,6 +885,13 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
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}
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entry->req.iov_bidi_cnt = iov_cnt;
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ret = tcmu_setup_cmd_timer(tcmu_cmd);
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if (ret) {
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tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
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return TCM_OUT_OF_RESOURCES;
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}
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entry->hdr.cmd_id = tcmu_cmd->cmd_id;
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/*
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* Recalaulate the command's base size and size according
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* to the actual needs
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@ -912,8 +925,6 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
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static sense_reason_t
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tcmu_queue_cmd(struct se_cmd *se_cmd)
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{
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struct se_device *se_dev = se_cmd->se_dev;
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struct tcmu_dev *udev = TCMU_DEV(se_dev);
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struct tcmu_cmd *tcmu_cmd;
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sense_reason_t ret;
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@ -924,9 +935,6 @@ tcmu_queue_cmd(struct se_cmd *se_cmd)
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ret = tcmu_queue_cmd_ring(tcmu_cmd);
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if (ret != TCM_NO_SENSE) {
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pr_err("TCMU: Could not queue command\n");
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spin_lock_irq(&udev->commands_lock);
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idr_remove(&udev->commands, tcmu_cmd->cmd_id);
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spin_unlock_irq(&udev->commands_lock);
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tcmu_free_cmd(tcmu_cmd);
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}
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