diff options
| author | Johan Hovold <johan@kernel.org> | 2017-10-10 05:46:07 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-17 11:42:51 +0200 |
| commit | 4f190e0b9de89c4c917c3ffb3799e9d00fc534ac (patch) | |
| tree | d1ac2123f7f412a2a4f66cf397a3bcd1842927a5 /drivers | |
| parent | usb: cdc_acm: Add quirk for Elatec TWN3 (diff) | |
| download | linux-4f190e0b9de89c4c917c3ffb3799e9d00fc534ac.tar.xz linux-4f190e0b9de89c4c917c3ffb3799e9d00fc534ac.zip | |
USB: musb: fix session-bit runtime-PM quirk
The current session-bit quirk implementation does not prevent the retry
counter from underflowing, something which could break runtime PM and
keep the device active for a very long time (about 2^32 seconds) after a
disconnect.
This notably breaks the B-device timeout case, but could potentially
cause problems also when the controller is operating as an A-device.
Fixes: 2bff3916fda9 ("usb: musb: Fix PM for hub disconnect")
Cc: stable <stable@vger.kernel.org> # 4.9
Cc: Tony Lindgren <tony@atomide.com>
Signed-off-by: Johan Hovold <johan@kernel.org>
Tested-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Bin Liu <b-liu@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/usb/musb/musb_core.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/drivers/usb/musb/musb_core.c b/drivers/usb/musb/musb_core.c index 029692053dd3..07b8c7152e3d 100644 --- a/drivers/usb/musb/musb_core.c +++ b/drivers/usb/musb/musb_core.c @@ -1861,22 +1861,22 @@ static void musb_pm_runtime_check_session(struct musb *musb) MUSB_DEVCTL_HR; switch (devctl & ~s) { case MUSB_QUIRK_B_INVALID_VBUS_91: - if (musb->quirk_retries--) { + if (musb->quirk_retries) { musb_dbg(musb, "Poll devctl on invalid vbus, assume no session"); schedule_delayed_work(&musb->irq_work, msecs_to_jiffies(1000)); - + musb->quirk_retries--; return; } /* fall through */ case MUSB_QUIRK_A_DISCONNECT_19: - if (musb->quirk_retries--) { + if (musb->quirk_retries) { musb_dbg(musb, "Poll devctl on possible host mode disconnect"); schedule_delayed_work(&musb->irq_work, msecs_to_jiffies(1000)); - + musb->quirk_retries--; return; } if (!musb->session) |