Messages in this thread | | | From | Colin Ian King <> | Subject | re: net: phy: continue searching for C45 MMDs even if first returned ffff:ffff | Date | Mon, 20 Jul 2020 17:21:13 +0100 |
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Hi,
Static analysis by Coverity has found a potential issue with the following commit in /drivers/net/phy/phy_device.c:
commit bba238ed037c60242332dd1e4c5778af9eba4d9b Author: Vladimir Oltean <vladimir.oltean@nxp.com> Date: Sun Jul 12 19:48:15 2020 +0300
net: phy: continue searching for C45 MMDs even if first returned ffff:ffff
The analysis is as follows:
735 * for 802.3 c45 complied PHYs, so don't probe it at first. 736 */
dead_error_condition: The condition (devs_in_pkg & 0x1fffffffU) == 0x1fffffffU cannot be true.
737 for (i = 1; i < MDIO_MMD_NUM && devs_in_pkg == 0 &&
const: At condition (devs_in_pkg & 0x1fffffffU) == 0x1fffffffU, the value of devs_in_pkg must be equal to 0.
738 (devs_in_pkg & 0x1fffffff) == 0x1fffffff; i++) {
Logically dead code (DEADCODE)dead_error_line: Execution cannot reach this statement: if (i == 30 || i == 31) {
To summarize, if devs_in_pkg is zero, then (devs_in_pkg & 0x1fffffffU) == 0x1fffffffU can never be true, so the loop is never iterated over.
Colin
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