diff mbox series

[net-next,4/7] net: phy: move phy_suspend() to end of phy_state_machine()

Message ID E1qgoNf-007a4O-47@rmk-PC.armlinux.org.uk (mailing list archive)
State Accepted
Commit 6e19b3502c59ad21aa405383dfd0bdf4e841de57
Delegated to: Netdev Maintainers
Headers show
Series net: phy: avoid race when erroring stopping PHY | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1340 this patch: 1340
netdev/cc_maintainers success CCed 8 of 8 maintainers
netdev/build_clang success Errors and warnings before: 1363 this patch: 1363
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1363 this patch: 1363
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 27 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Russell King (Oracle) Sept. 14, 2023, 3:35 p.m. UTC 
Move the call to phy_suspend() to the end of phy_state_machine() after
we release the lock so that we can combine the locked areas.
phy_suspend() can not be called while holding phydev->lock as it has
caused deadlocks in the past.

Tested-by: Jijie Shao <shaojijie@huawei.com>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
---
 drivers/net/phy/phy.c | 13 ++++++-------
 1 file changed, 6 insertions(+), 7 deletions(-)

Comments

Florian Fainelli Sept. 14, 2023, 6:22 p.m. UTC | #1 
On 9/14/23 08:35, Russell King (Oracle) wrote:
> Move the call to phy_suspend() to the end of phy_state_machine() after
> we release the lock so that we can combine the locked areas.
> phy_suspend() can not be called while holding phydev->lock as it has
> caused deadlocks in the past.
> 
> Tested-by: Jijie Shao <shaojijie@huawei.com>
> Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
diff mbox series

Patch

diff --git a/drivers/net/phy/phy.c b/drivers/net/phy/phy.c
index 5bb33af2a4cb..756326f38b14 100644
--- a/drivers/net/phy/phy.c
+++ b/drivers/net/phy/phy.c
@@ -1494,15 +1494,11 @@  void phy_state_machine(struct work_struct *work)
 		func = &_phy_start_aneg;
 	}
 
-	mutex_unlock(&phydev->lock);
-
-	if (do_suspend)
-		phy_suspend(phydev);
-
-	if (err == -ENODEV)
+	if (err == -ENODEV) {
+		mutex_unlock(&phydev->lock);
 		return;
+	}
 
-	mutex_lock(&phydev->lock);
 	if (err < 0)
 		phy_error_precise(phydev, func, err);
 
@@ -1519,6 +1515,9 @@  void phy_state_machine(struct work_struct *work)
 	if (phy_polling_mode(phydev) && phy_is_started(phydev))
 		phy_queue_state_machine(phydev, PHY_STATE_TIME);
 	mutex_unlock(&phydev->lock);
+
+	if (do_suspend)
+		phy_suspend(phydev);
 }
 
 /**