diff options
| author |   Dean Luick <dean.luick@intel.com> | 2016-04-12 11:28:36 -0700 |
|---|---|---|
| committer |   Doug Ledford <dledford@redhat.com> | 2016-04-28 16:32:28 -0400 |
| commit | e4e0e39c8d41d5f6cb664a34ac7b2c6388b1b523 (patch) | |
| tree | 4224c649e706e201f769907bd6a8dce6f31ddf4e /drivers/staging/rdma/hfi1/qsfp.c | |
| parent | IB/hfi1: Guard against concurrent I2C access across all chains (diff) | |
| download | linux-dev-e4e0e39c8d41d5f6cb664a34ac7b2c6388b1b523.tar.xz linux-dev-e4e0e39c8d41d5f6cb664a34ac7b2c6388b1b523.zip | |
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>
Diffstat (limited to '')
| -rw-r--r-- | drivers/staging/rdma/hfi1/qsfp.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/drivers/staging/rdma/hfi1/qsfp.c b/drivers/staging/rdma/hfi1/qsfp.c index dc5d1864dcd4..2441669f0817 100644 --- a/drivers/staging/rdma/hfi1/qsfp.c +++ b/drivers/staging/rdma/hfi1/qsfp.c @@ -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; } |