This is a note to let you know that I've just added the patch titled
staging: wlan-ng: Avoid bitwise vs logical OR warning in hfa384x_usb_throttlefn()
to the 4.9-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:
staging-wlan-ng-avoid-bitwise-vs-logical-or-warning-in-hfa384x_usb_throttlefn.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 502408a61f4b7eb4713f44bd77f4a48e6cb1b59a Mon Sep 17 00:00:00 2001
From: Nathan Chancellor <nathan@xxxxxxxxxx>
Date: Thu, 14 Oct 2021 14:57:03 -0700
Subject: staging: wlan-ng: Avoid bitwise vs logical OR warning in hfa384x_usb_throttlefn()
From: Nathan Chancellor <nathan@xxxxxxxxxx>
commit 502408a61f4b7eb4713f44bd77f4a48e6cb1b59a upstream.
A new warning in clang points out a place in this file where a bitwise
OR is being used with boolean expressions:
In file included from drivers/staging/wlan-ng/prism2usb.c:2:
drivers/staging/wlan-ng/hfa384x_usb.c:3787:7: warning: use of bitwise '|' with boolean operands [-Wbitwise-instead-of-logical]
((test_and_clear_bit(THROTTLE_RX, &hw->usb_flags) &&
~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/staging/wlan-ng/hfa384x_usb.c:3787:7: note: cast one or both operands to int to silence this warning
1 warning generated.
The comment explains that short circuiting here is undesirable, as the
calls to test_and_{clear,set}_bit() need to happen for both sides of the
expression.
Clang's suggestion would work to silence the warning but the readability
of the expression would suffer even more. To clean up the warning and
make the block more readable, use a variable for each side of the
bitwise expression.
Link: https://github.com/ClangBuiltLinux/linux/issues/1478
Signed-off-by: Nathan Chancellor <nathan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20211014215703.3705371-1-nathan@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/staging/wlan-ng/hfa384x_usb.c | 22 +++++++++++-----------
1 file changed, 11 insertions(+), 11 deletions(-)
--- a/drivers/staging/wlan-ng/hfa384x_usb.c
+++ b/drivers/staging/wlan-ng/hfa384x_usb.c
@@ -3848,18 +3848,18 @@ static void hfa384x_usb_throttlefn(unsig
spin_lock_irqsave(&hw->ctlxq.lock, flags);
- /*
- * We need to check BOTH the RX and the TX throttle controls,
- * so we use the bitwise OR instead of the logical OR.
- */
pr_debug("flags=0x%lx\n", hw->usb_flags);
- if (!hw->wlandev->hwremoved &&
- ((test_and_clear_bit(THROTTLE_RX, &hw->usb_flags) &&
- !test_and_set_bit(WORK_RX_RESUME, &hw->usb_flags)) |
- (test_and_clear_bit(THROTTLE_TX, &hw->usb_flags) &&
- !test_and_set_bit(WORK_TX_RESUME, &hw->usb_flags))
- )) {
- schedule_work(&hw->usb_work);
+ if (!hw->wlandev->hwremoved) {
+ bool rx_throttle = test_and_clear_bit(THROTTLE_RX, &hw->usb_flags) &&
+ !test_and_set_bit(WORK_RX_RESUME, &hw->usb_flags);
+ bool tx_throttle = test_and_clear_bit(THROTTLE_TX, &hw->usb_flags) &&
+ !test_and_set_bit(WORK_TX_RESUME, &hw->usb_flags);
+ /*
+ * We need to check BOTH the RX and the TX throttle controls,
+ * so we use the bitwise OR instead of the logical OR.
+ */
+ if (rx_throttle | tx_throttle)
+ schedule_work(&hw->usb_work);
}
spin_unlock_irqrestore(&hw->ctlxq.lock, flags);
Patches currently in stable-queue which might be from nathan@xxxxxxxxxx are
queue-4.9/staging-wlan-ng-avoid-bitwise-vs-logical-or-warning-in-hfa384x_usb_throttlefn.patch
queue-4.9/drm-i915-avoid-bitwise-vs-logical-or-warning-in-snb_wm_latency_quirk.patch
