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authorBrian King <brking@linux.vnet.ibm.com>2011-09-21 08:51:11 -0500
committerJames Bottomley <JBottomley@Parallels.com>2011-09-22 15:30:28 +0400
commit41e9a69641fb3fa86fa9277a179f3ad261d072f7 (patch)
treecceabbe07245bf46b87278586a273f35a62b17bf /drivers/scsi/ipr.c
parent5f7a643304553e87f531df95de0ed0d60c002627 (diff)
downloadop-kernel-dev-41e9a69641fb3fa86fa9277a179f3ad261d072f7.zip
op-kernel-dev-41e9a69641fb3fa86fa9277a179f3ad261d072f7.tar.gz
[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>
Diffstat (limited to 'drivers/scsi/ipr.c')
-rw-r--r--drivers/scsi/ipr.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c
index acbb924..f03963a 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,
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