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hw/net/imx_fec: return 0xffff when accessing non-existing PHY

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If a PHY does not exist, attempts to read from it should return 0xffff.
Otherwise the Linux kernel will believe that a PHY is there and select
the non-existing PHY. This in turn will result in network errors later
on since the real PHY is not selected or configured.

Since reading from or writing to a non-existing PHY is not an emulation
error, replace guest error messages with traces.

Fixes: 461c51ad42 ("Add a phy-num property to the i.MX FEC emulator")
Cc: Jean-Christophe Dubois <jcd@tribudubois.net>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Jason Wang <jasowang@redhat.com>
This commit is contained in:
Guenter Roeck 2021-05-03 06:53:00 -07:00 • committed by Jason Wang
parent d90f154867
commit f607dce2ed
2 changed files with 5 additions and 5 deletions
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8
hw/net/imx_fec.c
View file

@ -283,9 +283,8 @@ static uint32_t imx_phy_read(IMXFECState *s, int reg)
uint32_t phy = reg / 32;
if (phy != s->phy_num) {
qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
TYPE_IMX_FEC, __func__, phy);
return 0;
trace_imx_phy_read_num(phy, s->phy_num);
return 0xffff;
}
reg %= 32;
@ -345,8 +344,7 @@ static void imx_phy_write(IMXFECState *s, int reg, uint32_t val)
uint32_t phy = reg / 32;
if (phy != s->phy_num) {
qemu_log_mask(LOG_GUEST_ERROR, "[%s.phy]%s: Bad phy num %u\n",
TYPE_IMX_FEC, __func__, phy);
trace_imx_phy_write_num(phy, s->phy_num);
return;
}