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iwlwifi: pcie: try to get ownership several times

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Some races with the hardware can happen when we take
ownership of the device. Don't give up after the first try.

Cc: <stable@vger.kernel.org>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
This commit is contained in:
Emmanuel Grumbach 2014-05-08 12:15:22 +03:00
commit 501fd9895c
1 changed files with 16 additions and 10 deletions
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26
drivers/net/wireless/iwlwifi/pcie/trans.c
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@ -454,6 +454,7 @@ static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans)
{
int ret;
int t = 0;
int iter;
IWL_DEBUG_INFO(trans, "iwl_trans_prepare_card_hw enter\n");
@ -462,18 +463,23 @@ static int iwl_pcie_prepare_card_hw(struct iwl_trans *trans)
if (ret >= 0)
return 0;
/* If HW is not ready, prepare the conditions to check again */
iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
CSR_HW_IF_CONFIG_REG_PREPARE);
for (iter = 0; iter < 10; iter++) {
/* If HW is not ready, prepare the conditions to check again */
iwl_set_bit(trans, CSR_HW_IF_CONFIG_REG,
CSR_HW_IF_CONFIG_REG_PREPARE);
do {
ret = iwl_pcie_set_hw_ready(trans);
if (ret >= 0)
return 0;
do {
ret = iwl_pcie_set_hw_ready(trans);
if (ret >= 0)
return 0;
usleep_range(200, 1000);
t += 200;
} while (t < 150000);
usleep_range(200, 1000);
t += 200;
} while (t < 150000);
msleep(25);
}
IWL_DEBUG_INFO(trans, "got NIC after %d iterations\n", iter);
return ret;
}