Patch "net: dsa: mv88e6xxx: Correct check for empty list" has been added to the 6.6-stable tree

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This is a note to let you know that I've just added the patch titled

    net: dsa: mv88e6xxx: Correct check for empty list

to the 6.6-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     net-dsa-mv88e6xxx-correct-check-for-empty-list.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit f2443039b3205e6d8a3eadbb4cf29d3f70f5d265
Author: Simon Horman <horms@xxxxxxxxxx>
Date:   Tue Apr 30 18:46:45 2024 +0100

    net: dsa: mv88e6xxx: Correct check for empty list
    
    [ Upstream commit 4c7f3950a9fd53a62b156c0fe7c3a2c43b0ba19b ]
    
    Since commit a3c53be55c95 ("net: dsa: mv88e6xxx: Support multiple MDIO
    busses") mv88e6xxx_default_mdio_bus() has checked that the
    return value of list_first_entry() is non-NULL.
    
    This appears to be intended to guard against the list chip->mdios being
    empty.  However, it is not the correct check as the implementation of
    list_first_entry is not designed to return NULL for empty lists.
    
    Instead, use list_first_entry_or_null() which does return NULL if the
    list is empty.
    
    Flagged by Smatch.
    Compile tested only.
    
    Reviewed-by: Andrew Lunn <andrew@xxxxxxx>
    Signed-off-by: Simon Horman <horms@xxxxxxxxxx>
    Link: https://lore.kernel.org/r/20240430-mv88e6xx-list_empty-v3-1-c35c69d88d2e@xxxxxxxxxx
    Signed-off-by: Jakub Kicinski <kuba@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/net/dsa/mv88e6xxx/chip.c b/drivers/net/dsa/mv88e6xxx/chip.c
index 9571e1b1e59ef..354d4af134562 100644
--- a/drivers/net/dsa/mv88e6xxx/chip.c
+++ b/drivers/net/dsa/mv88e6xxx/chip.c
@@ -131,8 +131,8 @@ struct mii_bus *mv88e6xxx_default_mdio_bus(struct mv88e6xxx_chip *chip)
 {
 	struct mv88e6xxx_mdio_bus *mdio_bus;
 
-	mdio_bus = list_first_entry(&chip->mdios, struct mv88e6xxx_mdio_bus,
-				    list);
+	mdio_bus = list_first_entry_or_null(&chip->mdios,
+					    struct mv88e6xxx_mdio_bus, list);
 	if (!mdio_bus)
 		return NULL;
 




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