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author | James Bottomley <James.Bottomley@steeleye.com> | 2005-09-18 15:05:20 -0500 |
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committer | James Bottomley <jejb@titanic.(none)> | 2005-09-19 09:24:52 -0500 |
commit | 939647ee308e0ad924e776657704c7bedd498664 (patch) | |
tree | cfff68b8f65a53e186fd1e7443aa370885ac1ed9 /drivers/scsi/scsi_error.c | |
parent | a64358db1253b35d508a411e80a3ad23b859ec88 (diff) | |
download | kernel_samsung_smdk4412-939647ee308e0ad924e776657704c7bedd498664.zip kernel_samsung_smdk4412-939647ee308e0ad924e776657704c7bedd498664.tar.gz kernel_samsung_smdk4412-939647ee308e0ad924e776657704c7bedd498664.tar.bz2 |
[SCSI] fix oops on usb storage device disconnect
We fix the oops by enforcing the host state model. There have also
been two extra states added: SHOST_CANCEL_RECOVERY and
SHOST_DEL_RECOVERY so we can take the model through host removal while
the recovery thread is active.
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/scsi/scsi_error.c')
-rw-r--r-- | drivers/scsi/scsi_error.c | 23 |
1 files changed, 16 insertions, 7 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 895c945..af589fa 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -68,19 +68,24 @@ int scsi_eh_scmd_add(struct scsi_cmnd *scmd, int eh_flag) { struct Scsi_Host *shost = scmd->device->host; unsigned long flags; + int ret = 0; if (shost->eh_wait == NULL) return 0; spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_set_state(shost, SHOST_RECOVERY)) + if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) + goto out_unlock; + ret = 1; scmd->eh_eflags |= eh_flag; list_add_tail(&scmd->eh_entry, &shost->eh_cmd_q); - scsi_host_set_state(shost, SHOST_RECOVERY); shost->host_failed++; scsi_eh_wakeup(shost); + out_unlock: spin_unlock_irqrestore(shost->host_lock, flags); - return 1; + return ret; } /** @@ -176,8 +181,8 @@ void scsi_times_out(struct scsi_cmnd *scmd) } if (unlikely(!scsi_eh_scmd_add(scmd, SCSI_EH_CANCEL_CMD))) { - panic("Error handler thread not present at %p %p %s %d", - scmd, scmd->device->host, __FILE__, __LINE__); + scmd->result |= DID_TIME_OUT << 16; + __scsi_done(scmd); } } @@ -196,8 +201,7 @@ int scsi_block_when_processing_errors(struct scsi_device *sdev) { int online; - wait_event(sdev->host->host_wait, (sdev->host->shost_state != - SHOST_RECOVERY)); + wait_event(sdev->host->host_wait, !scsi_host_in_recovery(sdev->host)); online = scsi_device_online(sdev); @@ -1441,6 +1445,7 @@ static void scsi_eh_lock_door(struct scsi_device *sdev) static void scsi_restart_operations(struct Scsi_Host *shost) { struct scsi_device *sdev; + unsigned long flags; /* * If the door was locked, we need to insert a door lock request @@ -1460,7 +1465,11 @@ static void scsi_restart_operations(struct Scsi_Host *shost) SCSI_LOG_ERROR_RECOVERY(3, printk("%s: waking up host to restart\n", __FUNCTION__)); - scsi_host_set_state(shost, SHOST_RUNNING); + spin_lock_irqsave(shost->host_lock, flags); + if (scsi_host_set_state(shost, SHOST_RUNNING)) + if (scsi_host_set_state(shost, SHOST_CANCEL)) + BUG_ON(scsi_host_set_state(shost, SHOST_DEL)); + spin_unlock_irqrestore(shost->host_lock, flags); wake_up(&shost->host_wait); |