Patch "RISC-V: Don't fail in riscv_of_parent_hartid() for disabled HARTs" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    RISC-V: Don't fail in riscv_of_parent_hartid() for disabled HARTs

to the 6.6-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:
     risc-v-don-t-fail-in-riscv_of_parent_hartid-for-disa.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit aef4f87b6653518d5f507ee4883c8f166b6f5de7
Author: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
Date:   Fri Oct 27 21:12:53 2023 +0530

    RISC-V: Don't fail in riscv_of_parent_hartid() for disabled HARTs
    
    [ Upstream commit c4676f8dc1e12e68d6511f9ed89707fdad4c962c ]
    
    The riscv_of_processor_hartid() used by riscv_of_parent_hartid() fails
    for HARTs disabled in the DT. This results in the following warning
    thrown by the RISC-V INTC driver for the E-core on SiFive boards:
    
    [    0.000000] riscv-intc: unable to find hart id for /cpus/cpu@0/interrupt-controller
    
    The riscv_of_parent_hartid() is only expected to read the hartid
    from the DT so we directly call of_get_cpu_hwid() instead of calling
    riscv_of_processor_hartid().
    
    Fixes: ad635e723e17 ("riscv: cpu: Add 64bit hartid support on RV64")
    Signed-off-by: Anup Patel <apatel@xxxxxxxxxxxxxxxx>
    Reviewed-by: Atish Patra <atishp@xxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/20231027154254.355853-2-apatel@xxxxxxxxxxxxxxxx
    Signed-off-by: Palmer Dabbelt <palmer@xxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/arch/riscv/kernel/cpu.c b/arch/riscv/kernel/cpu.c
index c17dacb1141cb..157ace8b262c2 100644
--- a/arch/riscv/kernel/cpu.c
+++ b/arch/riscv/kernel/cpu.c
@@ -125,13 +125,14 @@ int __init riscv_early_of_processor_hartid(struct device_node *node, unsigned lo
  */
 int riscv_of_parent_hartid(struct device_node *node, unsigned long *hartid)
 {
-	int rc;
-
 	for (; node; node = node->parent) {
 		if (of_device_is_compatible(node, "riscv")) {
-			rc = riscv_of_processor_hartid(node, hartid);
-			if (!rc)
-				return 0;
+			*hartid = (unsigned long)of_get_cpu_hwid(node, 0);
+			if (*hartid == ~0UL) {
+				pr_warn("Found CPU without hart ID\n");
+				return -ENODEV;
+			}
+			return 0;
 		}
 	}