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driver core: Fix device_link_flag_is_sync_state_only() 

commit 7fddac12c3 upstream.

device_link_flag_is_sync_state_only() correctly returns true on the flags
of an existing device link that only implements sync_state() functionality.
However, it incorrectly and confusingly returns false if it's called with
DL_FLAG_SYNC_STATE_ONLY.

This bug doesn't manifest in any of the existing calls to this function,
but fix this confusing behavior to avoid future bugs.

Fixes: 67cad5c670 ("driver core: fw_devlink: Add DL_FLAG_CYCLE support to device links")
Signed-off-by: Saravana Kannan <saravanak@google.com>
Tested-by: Xu Yang <xu.yang_2@nxp.com>
Link: https://lore.kernel.org/r/20240202095636.868578-2-saravanak@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Saravana Kannan 2024-02-02 01:56:33 -08:00 committed by Greg Kroah-Hartman
parent 02f2b95b00
commit 0f081fcfaa
1 changed files with 4 additions and 2 deletions
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6
drivers/base/core.c
View File

@ -337,10 +337,12 @@ static bool device_is_ancestor(struct device *dev, struct device *target)
return false;
}
#define DL_MARKER_FLAGS (DL_FLAG_INFERRED | \
DL_FLAG_CYCLE | \
DL_FLAG_MANAGED)
static inline bool device_link_flag_is_sync_state_only(u32 flags)
{
return (flags & ~(DL_FLAG_INFERRED | DL_FLAG_CYCLE)) ==
(DL_FLAG_SYNC_STATE_ONLY | DL_FLAG_MANAGED);
return (flags & ~DL_MARKER_FLAGS) == DL_FLAG_SYNC_STATE_ONLY;
}
/**