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caif-hsi: Fixing a race condition in the caif_hsi code

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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>
This commit is contained in:
Dmitry Tarnyagin 2011-10-13 11:29:23 +00:00 committed by David S. Miller
parent 94230febe4
commit fe47f12508
1 changed files with 18 additions and 7 deletions
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25
drivers/net/caif/caif_hsi.c
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@ -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)