Re: [RFC PATCH net-next v3 05/20] net: dsa: qca8k: handle error with qca8k_read operation
From: Andrew Lunn <andrew@lunn.ch>
Date: 2021-05-05 00:36:23
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On Wed, May 05, 2021 at 12:28:59AM +0200, Ansuel Smith wrote:
quoted hunk ↗ jump to hunk
qca8k_read can fail. Rework any user to handle error values and correctly return. Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com> --- drivers/net/dsa/qca8k.c | 90 +++++++++++++++++++++++++++++++---------- 1 file changed, 69 insertions(+), 21 deletions(-)diff --git a/drivers/net/dsa/qca8k.c b/drivers/net/dsa/qca8k.c index 411b42d38819..cde68ed6856b 100644 --- a/drivers/net/dsa/qca8k.c +++ b/drivers/net/dsa/qca8k.c@@ -146,12 +146,13 @@ qca8k_set_page(struct mii_bus *bus, u16 page) static u32 qca8k_read(struct qca8k_priv *priv, u32 reg) { + struct mii_bus *bus = priv->bus; u16 r1, r2, page; u32 val; qca8k_split_addr(reg, &r1, &r2, &page); - mutex_lock_nested(&priv->bus->mdio_lock, MDIO_MUTEX_NESTED); + mutex_lock_nested(&bus->mdio_lock, MDIO_MUTEX_NESTED); val = qca8k_set_page(priv->bus, page); if (val < 0)@@ -160,8 +161,7 @@ qca8k_read(struct qca8k_priv *priv, u32 reg) val = qca8k_mii_read32(priv->bus, 0x10 | r2, r1); exit: - mutex_unlock(&priv->bus->mdio_lock); - + mutex_unlock(&bus->mdio_lock); return val;
This change does not have anything to do with the commit message.
quoted hunk ↗ jump to hunk
}@@ -226,8 +226,13 @@ static int qca8k_regmap_read(void *ctx, uint32_t reg, uint32_t *val) { struct qca8k_priv *priv = (struct qca8k_priv *)ctx; + int ret; - *val = qca8k_read(priv, reg); + ret = qca8k_read(priv, reg); + if (ret < 0) + return ret; + + *val = ret; return 0; }@@ -280,15 +285,17 @@ static int qca8k_busy_wait(struct qca8k_priv *priv, u32 reg, u32 mask) { unsigned long timeout; + u32 val; timeout = jiffies + msecs_to_jiffies(20); /* loop until the busy flag has cleared */ do { - u32 val = qca8k_read(priv, reg); - int busy = val & mask; + val = qca8k_read(priv, reg); + if (val < 0) + continue; - if (!busy) + if (!(val & mask)) break; cond_resched();
Maybe there is a patch doing this already, but it would be good to make use of include/linux/iopoll.h
qca8k_fdb_next(struct qca8k_priv *priv, struct qca8k_fdb *fdb, int port)
{
- int ret;
+ int ret, ret_read;
qca8k_fdb_write(priv, fdb->vid, fdb->port_mask, fdb->mac, fdb->aging);
ret = qca8k_fdb_access(priv, QCA8K_FDB_NEXT, port);
- if (ret >= 0)
- qca8k_fdb_read(priv, fdb);
+ if (ret >= 0) {
+ ret_read = qca8k_fdb_read(priv, fdb);
+ if (ret_read < 0)
+ return ret_read;
+ }
return ret;
}
This is oddly structured. Why not:
qca8k_fdb_next(struct qca8k_priv *priv, struct qca8k_fdb *fdb, int port)
{
int ret;
qca8k_fdb_write(priv, fdb->vid, fdb->port_mask, fdb->mac, fdb->aging);
ret = qca8k_fdb_access(priv, QCA8K_FDB_NEXT, port);
if (ret < 0)
return ret;
return qca8k_fdb_read(priv, fdb);
}
Andrew