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wil6210: move Rx reorder buffer allocation out of spinlock 

This fixes issue reported by Dan Carpenter:
The patch 3277213feb1b: "wil6210: ADDBA/DELBA flows" from Dec 23,
2014, leads to the following static checker warning:

        drivers/net/wireless/ath/wil6210/rx_reorder.c:205 wil_tid_ampdu_rx_alloc()
        error: scheduling with locks held: 'spin_lock:tid_rx_lock'

drivers/net/wireless/ath/wil6210/rx_reorder.c
   202  struct wil_tid_ampdu_rx *wil_tid_ampdu_rx_alloc(struct wil6210_priv *wil,
   203                                                  int size, u16 ssn)
   204  {
   205          struct wil_tid_ampdu_rx *r = kzalloc(sizeof(*r), GFP_KERNEL);
                                                                 ^^^^^^^^^^
   206
   207          if (!r)
   208                  return NULL;
   209
   210          r->reorder_buf =
   211                  kcalloc(size, sizeof(struct sk_buff *), GFP_KERNEL);
                                                                ^^^^^^^^^^^
   212          r->reorder_time =
   213                  kcalloc(size, sizeof(unsigned long), GFP_KERNEL);
                                                             ^^^^^^^^^^^
   214          if (!r->reorder_buf || !r->reorder_time) {
   215                  kfree(r->reorder_buf);
   216                  kfree(r->reorder_time);
   217                  kfree(r);
   218                  return NULL;
   219          }
   220

[ snip ]

   331          spin_lock_bh(&sta->tid_rx_lock);
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
spin lock held.

   332
   333          wil_tid_ampdu_rx_free(wil, sta->tid_rx[tid]);
   334          sta->tid_rx[tid] = wil_tid_ampdu_rx_alloc(wil, agg_wsize, ssn);
                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
function called with the lock held.

   335
   336          spin_unlock_bh(&sta->tid_rx_lock);

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Vladimir Kondratiev <qca_vkondrat@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Vladimir Kondratiev 2015-01-25 10:52:51 +02:00 committed by Kalle Valo
parent 40822a901e
commit 382afc3d05
1 changed files with 4 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/net/wireless/ath/wil6210/rx_reorder.c
View File

@ -1,5 +1,5 @@
/*
* Copyright (c) 2014 Qualcomm Atheros, Inc.
* Copyright (c) 2014-2015 Qualcomm Atheros, Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
@ -292,6 +292,7 @@ __acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
u16 agg_timeout = req->ba_timeout;
u16 status = WLAN_STATUS_SUCCESS;
u16 ssn = req->ba_seq_ctrl >> 4;
struct wil_tid_ampdu_rx *r;
int rc;
might_sleep();
@ -328,11 +329,10 @@ __acquires(&sta->tid_rx_lock) __releases(&sta->tid_rx_lock)
return;
/* apply */
r = wil_tid_ampdu_rx_alloc(wil, agg_wsize, ssn);
spin_lock_bh(&sta->tid_rx_lock);
wil_tid_ampdu_rx_free(wil, sta->tid_rx[tid]);
sta->tid_rx[tid] = wil_tid_ampdu_rx_alloc(wil, agg_wsize, ssn);
sta->tid_rx[tid] = r;
spin_unlock_bh(&sta->tid_rx_lock);
}