[PATCH 4.9 05/49] iwlwifi: mvm: take mutex for calling iwl_mvm_get_sync_time()

Greg Kroah-Hartman
2021-02-22T13:46:31Z

From: Johannes Berg <johannes.berg@intel.com>

[ Upstream commit 5c56d862c749669d45c256f581eac4244be00d4d ]

We need to take the mutex to call iwl_mvm_get_sync_time(), do it.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
Link: https://lore.kernel.org/r/iwlwifi.20210115130252.4bb5ccf881a6.I62973cbb081e80aa5b0447a5c3b9c3251a65cf6b@changeid
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c | 3 +++
1 file changed, 3 insertions(+)

diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
index f4d75ffe3d8a8..7f01fb91ea668 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/debugfs-vif.c
@@ -518,7 +518,10 @@ static ssize_t iwl_dbgfs_os_device_timediff_read(struct file *file,
const size_t bufsz = sizeof(buf);
int pos = 0;

+ mutex_lock(&mvm->mutex);
iwl_mvm_get_sync_time(mvm, &curr_gp2, &curr_os);
+ mutex_unlock(&mvm->mutex);
+
do_div(curr_os, NSEC_PER_USEC);
diff = curr_os - curr_gp2;
pos += scnprintf(buf + pos, bufsz - pos, "diff=%lld\n", diff);
--
2.27.0