diff options
| author | Dmitry Tarnyagin <dmitry.tarnyagin@stericsson.com> | 2011-10-13 15:29:23 +0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2011-10-19 11:25:41 +0400 |
| commit | fe47f1250805438fa06580c9ce6d37bc4bc595d2 (patch) | |
| tree | 1e5b35b1e1c6fedad2c9d2eb3ec51b0e10941866 /drivers | |
| parent | 94230febe47f82331f9493c4fd61085e2a6bf756 (diff) | |
| download | linux-fe47f1250805438fa06580c9ce6d37bc4bc595d2.tar.xz | |
caif-hsi: Fixing a race condition in the caif_hsi code
cfhsi->tx_state was not protected by a spin lock. TX soft-irq could interrupt
cfhsi_tx_done_work work leading to inconsistent state of the driver.
Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/caif/caif_hsi.c | 25 |
1 files changed, 18 insertions, 7 deletions
diff --git a/drivers/net/caif/caif_hsi.c b/drivers/net/caif/caif_hsi.c index 193781389f73..36da27b50114 100644 --- a/drivers/net/caif/caif_hsi.c +++ b/drivers/net/caif/caif_hsi.c @@ -304,14 +304,22 @@ static void cfhsi_tx_done_work(struct work_struct *work) spin_unlock_bh(&cfhsi->lock); /* Create HSI frame. */ - len = cfhsi_tx_frm(desc, cfhsi); - if (!len) { - cfhsi->tx_state = CFHSI_TX_STATE_IDLE; - /* Start inactivity timer. */ - mod_timer(&cfhsi->timer, + do { + len = cfhsi_tx_frm(desc, cfhsi); + if (!len) { + spin_lock_bh(&cfhsi->lock); + if (unlikely(skb_peek(&cfhsi->qhead))) { + spin_unlock_bh(&cfhsi->lock); + continue; + } + cfhsi->tx_state = CFHSI_TX_STATE_IDLE; + /* Start inactivity timer. */ + mod_timer(&cfhsi->timer, jiffies + CFHSI_INACTIVITY_TOUT); - break; - } + spin_unlock_bh(&cfhsi->lock); + goto done; + } + } while (!len); /* Set up new transfer. */ res = cfhsi->dev->cfhsi_tx(cfhsi->tx_buf, len, cfhsi->dev); @@ -320,6 +328,9 @@ static void cfhsi_tx_done_work(struct work_struct *work) __func__, res); } } while (res < 0); + +done: + return; } static void cfhsi_tx_done_cb(struct cfhsi_drv *drv) |