diff mbox series

usb: musb: sunxi: Fix accessing an released usb phy

Message ID 20241029-sunxi_fix-v1-1-9431ed2ab826@quicinc.com
State New
Headers show
Series usb: musb: sunxi: Fix accessing an released usb phy | expand

Commit Message

Zijun Hu Oct. 29, 2024, 3:13 p.m. UTC 
From: Zijun Hu <quic_zijuhu@quicinc.com>

Commit 6ed05c68cbca ("usb: musb: sunxi: Explicitly release USB PHY on
exit") will cause that usb phy @glue->xceiv is accessed after released.

1) register platform driver @sunxi_musb_driver
// get the usb phy @glue->xceiv
sunxi_musb_probe() -> devm_usb_get_phy().

2) register and unregister platform driver @musb_driver
musb_probe() -> sunxi_musb_init()
use the phy here
//the phy is released here
musb_remove() -> sunxi_musb_exit() -> devm_usb_put_phy()

3) register @musb_driver again
musb_probe() -> sunxi_musb_init()
use the phy here but the phy has been released at 2).
...

Fixed by reverting the commit, namely, removing devm_usb_put_phy()
from sunxi_musb_exit().

Fixes: 6ed05c68cbca ("usb: musb: sunxi: Explicitly release USB PHY on exit")
Cc: stable@vger.kernel.org
Signed-off-by: Zijun Hu <quic_zijuhu@quicinc.com>
---
 drivers/usb/musb/sunxi.c | 2 --
 1 file changed, 2 deletions(-)


---
base-commit: afb92ad8733ef0a2843cc229e4d96aead80bc429
change-id: 20241029-sunxi_fix-07fe18228733

Best regards,
diff mbox series

Patch

diff --git a/drivers/usb/musb/sunxi.c b/drivers/usb/musb/sunxi.c
index d54283fd026b..05b6e7e52e02 100644
--- a/drivers/usb/musb/sunxi.c
+++ b/drivers/usb/musb/sunxi.c
@@ -293,8 +293,6 @@  static int sunxi_musb_exit(struct musb *musb)
 	if (test_bit(SUNXI_MUSB_FL_HAS_SRAM, &glue->flags))
 		sunxi_sram_release(musb->controller->parent);
 
-	devm_usb_put_phy(glue->dev, glue->xceiv);
-
 	return 0;
 }