diff options
| author | Caveh Jalali <caveh@chromium.org> | 2020-05-28 18:19:36 -0700 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2020-06-06 09:26:02 +0000 |
| commit | 96f231ac4b68fa34a2c0a6354f5089374ccc15c3 (patch) | |
| tree | c4f960bc9a129e200cf3ac7be97409e727eefb3b /payloads | |
| parent | 0a9e72e87e573183d713fca928c75464f829e5a8 (diff) | |
| download | coreboot-96f231ac4b68fa34a2c0a6354f5089374ccc15c3.tar.xz | |
usb/xhci: Fix timeout logic
This fixes a logic bug in how timeouts are reported back. In the
timeout case, the original code would return -1 instead of 0. All call
sites expect a return value of 0 as the timeout indicator.
Signed-off-by: Caveh Jalali <caveh@chromium.org>
Change-Id: I81a888aa0a1544e55e6a680be8f3b7f6e0d87812
Reviewed-on: https://review.coreboot.org/c/coreboot/+/41854
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Diffstat (limited to 'payloads')
| -rw-r--r-- | payloads/libpayload/drivers/usb/xhci.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/payloads/libpayload/drivers/usb/xhci.c b/payloads/libpayload/drivers/usb/xhci.c index 07d5b16486..749ff0a066 100644 --- a/payloads/libpayload/drivers/usb/xhci.c +++ b/payloads/libpayload/drivers/usb/xhci.c @@ -129,7 +129,12 @@ xhci_switchback_ppt_ports(pcidev_t addr) static long xhci_handshake(volatile u32 *const reg, u32 mask, u32 wait_for, long timeout_us) { - while ((*reg & mask) != wait_for && timeout_us--) udelay(1); + if (timeout_us <= 0) + return 0; + while ((*reg & mask) != wait_for && timeout_us != 0) { + --timeout_us; + udelay(1); + } return timeout_us; } |