From: Kangjie Lu kjlu@umn.edu
[ Upstream commit 22e8860cf8f777fbf6a83f2fb7127f682a8e9de4 ]
regmap_update_bits could fail and deserves a check.
The patch adds the checks and if it fails, returns its error code upstream.
Signed-off-by: Kangjie Lu kjlu@umn.edu Reviewed-by: Mukesh Ojha mojha@codeaurora.org Signed-off-by: Stefan Schmidt stefan@datenfreihafen.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ieee802154/mcr20a.c | 6 ++++++ 1 file changed, 6 insertions(+)
diff --git a/drivers/net/ieee802154/mcr20a.c b/drivers/net/ieee802154/mcr20a.c index 04891429a5542..fe4057fca83d8 100644 --- a/drivers/net/ieee802154/mcr20a.c +++ b/drivers/net/ieee802154/mcr20a.c @@ -539,6 +539,8 @@ mcr20a_start(struct ieee802154_hw *hw) dev_dbg(printdev(lp), "no slotted operation\n"); ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1, DAR_PHY_CTRL1_SLOTTED, 0x0); + if (ret < 0) + return ret;
/* enable irq */ enable_irq(lp->spi->irq); @@ -546,11 +548,15 @@ mcr20a_start(struct ieee802154_hw *hw) /* Unmask SEQ interrupt */ ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL2, DAR_PHY_CTRL2_SEQMSK, 0x0); + if (ret < 0) + return ret;
/* Start the RX sequence */ dev_dbg(printdev(lp), "start the RX sequence\n"); ret = regmap_update_bits(lp->regmap_dar, DAR_PHY_CTRL1, DAR_PHY_CTRL1_XCVSEQ_MASK, MCR20A_XCVSEQ_RX); + if (ret < 0) + return ret;
return 0; }