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| author | Adriano Vero <adri.vero.dev@gmail.com> | 2026-05-07 01:20:23 +0300 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2026-06-02 08:53:57 +0300 |
| commit | b3580dd1c68cec23d44a39c439e18b4686c13480 (patch) | |
| tree | ee6d122a1ab471c7b65a515309f640a110c8dafe /include/linux/stackprotector.h | |
| parent | b55b6b9ad76cdb82123c62a15c6a4ebe4abb8bfa (diff) | |
| download | linux-b3580dd1c68cec23d44a39c439e18b4686c13480.tar.xz | |
powerpc/fadump: Add timeout to RTAS busy-wait loops
The ibm,configure-kernel-dump RTAS call sites in
rtas_fadump_register(), rtas_fadump_unregister(), and
rtas_fadump_invalidate() polled indefinitely while firmware returned
a busy status. A misbehaving or hung firmware could stall these paths
forever, blocking fadump registration at boot or preventing clean
teardown.
Introduce rtas_fadump_call(), a helper that wraps the common
busy-wait pattern shared by all three sites. The helper accumulates
the total delay and returns -ETIMEDOUT if firmware keeps returning a
busy status beyond RTAS_FADUMP_MAX_WAIT_MS (60 seconds). A pr_debug()
message is emitted on each busy iteration to aid diagnosis when the
timeout is hit.
Signed-off-by: Adriano Vero <adri.vero.dev@gmail.com>
Reviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com>
[Maddy: Fixed newline after Signed-off-by]
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260506222024.30352-1-adri.vero.dev@gmail.com
Diffstat (limited to 'include/linux/stackprotector.h')
0 files changed, 0 insertions, 0 deletions