* Re: [PATCH] ath:Release resources for structure pointer, ar if error pointing device in the function, ath10k_core_register_work
[not found] <1425350171-26333-1-git-send-email-xerofoify@gmail.com>
@ 2015-03-03 6:40 ` Michal Kazior
0 siblings, 0 replies; only message in thread
From: Michal Kazior @ 2015-03-03 6:40 UTC (permalink / raw)
To: Nicholas Krause
Cc: Kalle Valo, Network Development, linux-wireless, linux-kernel, ath10k
On 3 March 2015 at 03:36, Nicholas Krause <xerofoify@gmail.com> wrote:
> Releases resources and deregisters the stucture pointer ar passed by the caller to the function, ath10k_core_register_work
> if unable to probe the structure pointer successfully with a call to ath10k_core_probe_fw. Further more if this happerns
> we must first jump to the label err for the goto statement required to jump to handle this particular error in the function,
> ath10k_core_register_work. After we are in the correct error section we must free the resources for the structure pointer,ar
> with a call to the function, ath10k_core_unregister to free resources allocated for the structure pointer,ar.
>
> Signed-off-by: Nicholas Krause <xerofoify@gmail.com>
> ---
> drivers/net/wireless/ath/ath10k/core.c | 4 +---
> 1 file changed, 1 insertion(+), 3 deletions(-)
>
> diff --git a/drivers/net/wireless/ath/ath10k/core.c b/drivers/net/wireless/ath/ath10k/core.c
> index 310e12b..8b2ca25 100644
> --- a/drivers/net/wireless/ath/ath10k/core.c
> +++ b/drivers/net/wireless/ath/ath10k/core.c
> @@ -1307,9 +1307,7 @@ err_unregister_mac:
> err_release_fw:
> ath10k_core_free_firmware_files(ar);
> err:
> - /* TODO: It's probably a good idea to release device from the driver
> - * but calling device_release_driver() here will cause a deadlock.
> - */
> + ath10k_core_unregister(ar);
> return;
> }
Did you test this? This will deadlock. ath10k_core_unregister() tries
to cancel ar->register_work. This won't work if you call it from the
worker itself. Moreover if I ignore the deadlock
ath10k_core_unregister() would do nothing else in this context because
ATH10K_FLAG_CORE_REGISTERED wouldn't be even set.
If you're interested in dealing with this TODO I suggest you read
through the original thread which led to the current state of affairs:
http://www.spinics.net/lists/linux-wireless/msg124004.html
Michał
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2015-03-03 6:40 ` [PATCH] ath:Release resources for structure pointer, ar if error pointing device in the function, ath10k_core_register_work Michal Kazior
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