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igc: change default return of igc_read_phy_reg()
[ Upstream commit 05682a0 ] Static analysis reports this problem igc_main.c:4944:20: warning: The left operand of '&' is a garbage value if (!(phy_data & SR_1000T_REMOTE_RX_STATUS) && ~~~~~~~~ ^ phy_data is set by the call to igc_read_phy_reg() only if there is a read_reg() op, else it is unset and a 0 is returned. Change the return to -EOPNOTSUPP. Fixes: 208983f ("igc: Add watchdog") Signed-off-by: Tom Rix <trix@redhat.com> Tested-by: Dvora Fuxbrumer <dvorax.fuxbrumer@linux.intel.com> Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
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