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authorDmitry Tarnyagin <dmitry.tarnyagin@stericsson.com>2011-10-13 15:29:23 +0400
committerDavid S. Miller <davem@davemloft.net>2011-10-19 11:25:41 +0400
commitfe47f1250805438fa06580c9ce6d37bc4bc595d2 (patch)
tree1e5b35b1e1c6fedad2c9d2eb3ec51b0e10941866 /drivers/net/caif
parent94230febe47f82331f9493c4fd61085e2a6bf756 (diff)
downloadlinux-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/net/caif')
-rw-r--r--drivers/net/caif/caif_hsi.c25
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)