On 14.08.2018 09:50, Ajay Singh wrote:
> Avoid use of static variable 'clients_count' and move it part of 'wilc'
> structure.
>
> Signed-off-by: Ajay Singh <ajay.kat...@microchip.com>
> ---
> drivers/staging/wilc1000/host_interface.c | 9 ++++-----
> drivers/staging/wilc1000/wilc_wfi_netdevice.h | 1 +
> 2 files changed, 5 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/staging/wilc1000/host_interface.c
> b/drivers/staging/wilc1000/host_interface.c
> index 6225e67..d930f06 100644
> --- a/drivers/staging/wilc1000/host_interface.c
> +++ b/drivers/staging/wilc1000/host_interface.c
> @@ -199,7 +199,6 @@ static u8 rcv_assoc_resp[MAX_ASSOC_RESP_FRAME_SIZE];
>
> static u8 set_ip[2][4];
> static u8 get_ip[2][4];
> -static u32 clients_count;
>
> static int host_int_get_ipaddress(struct wilc_vif *vif, u8 *ip_addr, u8 idx);
>
> @@ -3456,7 +3455,7 @@ int wilc_init(struct net_device *dev, struct
> host_if_drv **hif_drv_handler)
>
> vif->obtaining_ip = false;
>
> - if (clients_count == 0) {
> + if (wilc->clients_count == 0) {
The check of this should be mutex protected or a hif init/deinit should be
done in probe/remove code not not in open (I'm for the second approach).
Imagine this scenario:
vif 1: is down
vif 2: is down. "ifconfig vif2 up" is executed and the execution reach this
point and then suspends after "if (wilc->clients_count == 0)" check
vif 1: "ifconfig vif1 up" and execution reach the end of this function and
then the execution for vif 2 resumes. This will init twice the hif
mutex, completion etc.
> init_completion(&hif_driver_comp);
> mutex_init(&hif_deinit_lock);
>
> @@ -3490,7 +3489,7 @@ int wilc_init(struct net_device *dev, struct
> host_if_drv **hif_drv_handler)
>
> mutex_unlock(&hif_drv->cfg_values_lock);
>
> - clients_count++;
> + wilc->clients_count++;
>
> return 0;
> }
> @@ -3526,7 +3525,7 @@ int wilc_deinit(struct wilc_vif *vif)
>
> hif_drv->hif_state = HOST_IF_IDLE;
>
> - if (clients_count == 1) {
> + if (vif->wilc->clients_count == 1) {
> struct host_if_msg *msg;
>
> msg = wilc_alloc_work(vif, handle_hif_exit_work, true);
> @@ -3544,7 +3543,7 @@ int wilc_deinit(struct wilc_vif *vif)
>
> kfree(hif_drv);
>
> - clients_count--;
> + vif->wilc->clients_count--;
> terminated_handle = NULL;
> mutex_unlock(&hif_deinit_lock);
> return result;
> diff --git a/drivers/staging/wilc1000/wilc_wfi_netdevice.h
> b/drivers/staging/wilc1000/wilc_wfi_netdevice.h
> index 8e56a28..8cccbbc 100644
> --- a/drivers/staging/wilc1000/wilc_wfi_netdevice.h
> +++ b/drivers/staging/wilc1000/wilc_wfi_netdevice.h
> @@ -171,6 +171,7 @@ struct wilc {
>
> struct rf_info dummy_statistics;
> bool enable_ps;
> + int clients_count;
> };
>
> struct wilc_wfi_mon_priv {
>
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