diff options
| author | Brian King <brking@linux.vnet.ibm.com> | 2011-09-21 08:51:11 -0500 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2011-09-22 15:30:28 +0400 |
| commit | 41e9a69641fb3fa86fa9277a179f3ad261d072f7 (patch) | |
| tree | cceabbe07245bf46b87278586a273f35a62b17bf | |
| parent | 5f7a643304553e87f531df95de0ed0d60c002627 (diff) | |
| download | linux-41e9a69641fb3fa86fa9277a179f3ad261d072f7.tar.bz2 | |
[SCSI] ipr: Stop reading adapter dump prematurely
When the ipr driver decides to dump the adapter, it changes the
sdt_state to GET_DUMP, then prepares the adapter so that the dump
can be read. However, if the ipr worker thread wakes up for some
reason before the driver has put the adapter in a state where it
can succesfully dump the adapter, the driver will start dumping
the adapter too early, which can potentially trigger a BUG check
in the pci config blocking API. Fix this by adding a new
sdt_state to differentiate between the ipr driver wanting to dump
the adapter in the near future and wanting to dump the adapter now.
Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
| -rw-r--r-- | drivers/scsi/ipr.c | 15 | ||||
| -rw-r--r-- | drivers/scsi/ipr.h | 1 |
2 files changed, 12 insertions, 4 deletions
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c index acbb9241262d..f03963a972fc 100644 --- a/drivers/scsi/ipr.c +++ b/drivers/scsi/ipr.c @@ -2901,7 +2901,7 @@ static void ipr_get_ioa_dump(struct ipr_ioa_cfg *ioa_cfg, struct ipr_dump *dump) spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags); - if (ioa_cfg->sdt_state != GET_DUMP) { + if (ioa_cfg->sdt_state != READ_DUMP) { spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags); return; } @@ -3097,7 +3097,7 @@ static void ipr_worker_thread(struct work_struct *work) ENTER; spin_lock_irqsave(ioa_cfg->host->host_lock, lock_flags); - if (ioa_cfg->sdt_state == GET_DUMP) { + if (ioa_cfg->sdt_state == READ_DUMP) { dump = ioa_cfg->dump; if (!dump) { spin_unlock_irqrestore(ioa_cfg->host->host_lock, lock_flags); @@ -7449,6 +7449,8 @@ static int ipr_reset_wait_for_dump(struct ipr_cmnd *ipr_cmd) struct ipr_ioa_cfg *ioa_cfg = ipr_cmd->ioa_cfg; if (ioa_cfg->sdt_state == GET_DUMP) + ioa_cfg->sdt_state = WAIT_FOR_DUMP; + else if (ioa_cfg->sdt_state == READ_DUMP) ioa_cfg->sdt_state = ABORT_DUMP; ipr_cmd->job_step = ipr_reset_alert; @@ -7614,6 +7616,7 @@ static int ipr_reset_restore_cfg_space(struct ipr_cmnd *ipr_cmd) ipr_cmd->job_step = ipr_reset_enable_ioa; if (GET_DUMP == ioa_cfg->sdt_state) { + ioa_cfg->sdt_state = READ_DUMP; if (ioa_cfg->sis64) ipr_reset_start_timer(ipr_cmd, IPR_SIS64_DUMP_TIMEOUT); else @@ -8003,8 +8006,12 @@ static void ipr_initiate_ioa_reset(struct ipr_ioa_cfg *ioa_cfg, if (ioa_cfg->ioa_is_dead) return; - if (ioa_cfg->in_reset_reload && ioa_cfg->sdt_state == GET_DUMP) - ioa_cfg->sdt_state = ABORT_DUMP; + if (ioa_cfg->in_reset_reload) { + if (ioa_cfg->sdt_state == GET_DUMP) + ioa_cfg->sdt_state = WAIT_FOR_DUMP; + else if (ioa_cfg->sdt_state == READ_DUMP) + ioa_cfg->sdt_state = ABORT_DUMP; + } if (ioa_cfg->reset_retries++ >= IPR_NUM_RESET_RELOAD_RETRIES) { dev_err(&ioa_cfg->pdev->dev, diff --git a/drivers/scsi/ipr.h b/drivers/scsi/ipr.h index f93f8637c5a1..f9766f84d91c 100644 --- a/drivers/scsi/ipr.h +++ b/drivers/scsi/ipr.h @@ -1360,6 +1360,7 @@ enum ipr_sdt_state { INACTIVE, WAIT_FOR_DUMP, GET_DUMP, + READ_DUMP, ABORT_DUMP, DUMP_OBTAINED }; |