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drivers/net: process the result of hdlc_open() and add call of hdlc_close() in uhdlc_close()

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[ Upstream commit a59addacf899b1b21a7b7449a1c52c98704c2472 ]

Process the result of hdlc_open() and call uhdlc_close()
in case of an error. It is necessary to pass the error
code up the control flow, similar to a possible
error in request_irq().
Also add a hdlc_close() call to the uhdlc_close()
because the comment to hdlc_close() says it must be called
by the hardware driver when the HDLC device is being closed

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: c19b6d246a35 ("drivers/net: support hdlc function for QE-UCC")
Signed-off-by: Alexandra Diupina <adiupina@astralinux.ru>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Alexandra Diupina 2023-09-19 17:25:02 +03:00 committed by Greg Kroah-Hartman
parent 16cc18b908
commit ded67599d6
1 changed files with 10 additions and 2 deletions
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12
drivers/net/wan/fsl_ucc_hdlc.c
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@ -37,6 +37,8 @@
#define TDM_PPPOHT_SLIC_MAXIN
static int uhdlc_close(struct net_device *dev);
static struct ucc_tdm_info utdm_primary_info = {
.uf_info = {
.tsa = 0,
@ -661,6 +663,7 @@ static int uhdlc_open(struct net_device *dev)
hdlc_device *hdlc = dev_to_hdlc(dev);
struct ucc_hdlc_private *priv = hdlc->priv;
struct ucc_tdm *utdm = priv->utdm;
int rc = 0;
if (priv->hdlc_busy != 1) {
if (request_irq(priv->ut_info->uf_info.irq,
@ -683,10 +686,13 @@ static int uhdlc_open(struct net_device *dev)
netif_device_attach(priv->ndev);
napi_enable(&priv->napi);
netif_start_queue(dev);
hdlc_open(dev);
rc = hdlc_open(dev);
if (rc)
uhdlc_close(dev);
}
return 0;
return rc;
}
static void uhdlc_memclean(struct ucc_hdlc_private *priv)
@ -775,6 +781,8 @@ static int uhdlc_close(struct net_device *dev)
netif_stop_queue(dev);
priv->hdlc_busy = 0;
hdlc_close(dev);
return 0;
}