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IB/hfi1: Fix double QSFP resource acquire on cache refresh 

The function refresh_qsfp_cache() acquires the i2c chain resource,
but one caller already holds the resource.  Change the acquire so
all calls to refresh_qsfp_cache() are covered by the acquire and
remove the acquire within refresh_qsfp_cache().

Reviewed-by: Easwar Hariharan <easwar.hariharan@intel.com>
Signed-off-by: Dean Luick <dean.luick@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Dean Luick 2016-04-12 11:28:36 -07:00 committed by Doug Ledford
parent 90315ad86a
commit e4e0e39c8d
2 changed files with 23 additions and 29 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

40
drivers/staging/rdma/hfi1/platform.c
View File

@ -603,6 +603,7 @@ static void apply_tunings(
"Applying TX settings");
}
/* Must be holding the QSFP i2c resource */
static int tune_active_qsfp(struct hfi1_pportdata *ppd, u32 *ptr_tx_preset,
u32 *ptr_rx_preset, u32 *ptr_total_atten)
{
@ -610,26 +611,19 @@ static int tune_active_qsfp(struct hfi1_pportdata *ppd, u32 *ptr_tx_preset,
u16 lss = ppd->link_speed_supported, lse = ppd->link_speed_enabled;
u8 *cache = ppd->qsfp_info.cache;
ret = acquire_chip_resource(ppd->dd, qsfp_resource(ppd->dd), QSFP_WAIT);
if (ret) {
dd_dev_err(ppd->dd, "%s: hfi%d: cannot lock i2c chain\n",
__func__, (int)ppd->dd->hfi1_id);
return ret;
}
ppd->qsfp_info.limiting_active = 1;
ret = set_qsfp_tx(ppd, 0);
if (ret)
goto bail_unlock;
return ret;
ret = qual_power(ppd);
if (ret)
goto bail_unlock;
return ret;
ret = qual_bitrate(ppd);
if (ret)
goto bail_unlock;
return ret;
if (ppd->qsfp_info.reset_needed) {
reset_qsfp(ppd);
@ -641,7 +635,7 @@ static int tune_active_qsfp(struct hfi1_pportdata *ppd, u32 *ptr_tx_preset,
ret = set_qsfp_high_power(ppd);
if (ret)
goto bail_unlock;
return ret;
if (cache[QSFP_EQ_INFO_OFFS] & 0x4) {
ret = get_platform_config_field(
@ -651,7 +645,7 @@ static int tune_active_qsfp(struct hfi1_pportdata *ppd, u32 *ptr_tx_preset,
ptr_tx_preset, 4);
if (ret) {
*ptr_tx_preset = OPA_INVALID_INDEX;
goto bail_unlock;
return ret;
}
} else {
ret = get_platform_config_field(
@ -661,7 +655,7 @@ static int tune_active_qsfp(struct hfi1_pportdata *ppd, u32 *ptr_tx_preset,
ptr_tx_preset, 4);
if (ret) {
*ptr_tx_preset = OPA_INVALID_INDEX;
goto bail_unlock;
return ret;
}
}
@ -670,7 +664,7 @@ static int tune_active_qsfp(struct hfi1_pportdata *ppd, u32 *ptr_tx_preset,
PORT_TABLE_RX_PRESET_IDX, ptr_rx_preset, 4);
if (ret) {
*ptr_rx_preset = OPA_INVALID_INDEX;
goto bail_unlock;
return ret;
}
if ((lss & OPA_LINK_SPEED_25G) && (lse & OPA_LINK_SPEED_25G))
@ -690,8 +684,6 @@ static int tune_active_qsfp(struct hfi1_pportdata *ppd, u32 *ptr_tx_preset,
ret = set_qsfp_tx(ppd, 1);
bail_unlock:
release_chip_resource(ppd->dd, qsfp_resource(ppd->dd));
return ret;
}
@ -846,6 +838,14 @@ void tune_serdes(struct hfi1_pportdata *ppd)
break;
case PORT_TYPE_QSFP:
if (qsfp_mod_present(ppd)) {
ret = acquire_chip_resource(ppd->dd,
qsfp_resource(ppd->dd),
QSFP_WAIT);
if (ret) {
dd_dev_err(ppd->dd, "%s: hfi%d: cannot lock i2c chain\n",
__func__, (int)ppd->dd->hfi1_id);
goto bail;
}
refresh_qsfp_cache(ppd, &ppd->qsfp_info);
if (ppd->qsfp_info.cache_valid) {
@ -860,17 +860,17 @@ void tune_serdes(struct hfi1_pportdata *ppd)
* update the cache to reflect the changes
*/
refresh_qsfp_cache(ppd, &ppd->qsfp_info);
if (ret)
goto bail;
limiting_active =
ppd->qsfp_info.limiting_active;
} else {
dd_dev_err(dd,
"%s: Reading QSFP memory failed\n",
__func__);
goto bail;
ret = -EINVAL; /* a fail indication */
}
release_chip_resource(ppd->dd, qsfp_resource(ppd->dd));
if (ret)
goto bail;
} else {
ppd->offline_disabled_reason =
HFI1_ODR_MASK(

12
drivers/staging/rdma/hfi1/qsfp.c
View File

@ -355,6 +355,8 @@ int one_qsfp_read(struct hfi1_pportdata *ppd, u32 target, int addr, void *bp,
* The calls to qsfp_{read,write} in this function correctly handle the
* address map difference between this mapping and the mapping implemented
* by those functions
*
* The caller must be holding the QSFP i2c chain resource.
*/
int refresh_qsfp_cache(struct hfi1_pportdata *ppd, struct qsfp_data *cp)
{
@ -371,13 +373,9 @@ int refresh_qsfp_cache(struct hfi1_pportdata *ppd, struct qsfp_data *cp)
if (!qsfp_mod_present(ppd)) {
ret = -ENODEV;
goto bail_no_release;
goto bail;
}
ret = acquire_chip_resource(ppd->dd, qsfp_resource(ppd->dd), QSFP_WAIT);
if (ret)
goto bail_no_release;
ret = qsfp_read(ppd, target, 0, cache, QSFP_PAGESIZE);
if (ret != QSFP_PAGESIZE) {
dd_dev_info(ppd->dd,
@ -440,8 +438,6 @@ int refresh_qsfp_cache(struct hfi1_pportdata *ppd, struct qsfp_data *cp)
}
}
release_chip_resource(ppd->dd, qsfp_resource(ppd->dd));
spin_lock_irqsave(&ppd->qsfp_info.qsfp_lock, flags);
ppd->qsfp_info.cache_valid = 1;
ppd->qsfp_info.cache_refresh_required = 0;
@ -450,8 +446,6 @@ int refresh_qsfp_cache(struct hfi1_pportdata *ppd, struct qsfp_data *cp)
return 0;
bail:
release_chip_resource(ppd->dd, qsfp_resource(ppd->dd));
bail_no_release:
memset(cache, 0, (QSFP_MAX_NUM_PAGES * 128));
return ret;
}