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iwlwifi: mvm: fix possible division by zero 

Theoretically we may get only one IRQ from OS, in which
case we will have only 1 queue even in MSIx mode.
This will cause division by zero in the indirection table
calculation.
We do not need send the command in that case, as there is
only one queue so all RX traffic will be directed to it
anyway. Bail out early if there is only one queue.

Signed-off-by: Sara Sharon <sara.sharon@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
This commit is contained in:
Sara Sharon 2016-05-04 14:22:10 +03:00 committed by Luca Coelho
parent 2047fa5401
commit f43495fd5e
1 changed files with 3 additions and 0 deletions
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3
drivers/net/wireless/intel/iwlwifi/mvm/fw.c
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@ -122,6 +122,9 @@ static int iwl_send_rss_cfg_cmd(struct iwl_mvm *mvm)
IWL_RSS_HASH_TYPE_IPV6_PAYLOAD, IWL_RSS_HASH_TYPE_IPV6_PAYLOAD,
}; };
if (mvm->trans->num_rx_queues == 1)
return 0;
/* Do not direct RSS traffic to Q 0 which is our fallback queue */ /* Do not direct RSS traffic to Q 0 which is our fallback queue */
for (i = 0; i < ARRAY_SIZE(cmd.indirection_table); i++) for (i = 0; i < ARRAY_SIZE(cmd.indirection_table); i++)
cmd.indirection_table[i] = cmd.indirection_table[i] =