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Mon, 06 Apr 2026 21:07:46 -0700 (PDT) From: Ritesh Harjani (IBM) To: Adriano Vero , maddy@linux.ibm.com, mpe@ellerman.id.au Cc: npiggin@gmail.com, chleroy@kernel.org, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Adriano Vero Subject: Re: [PATCH] powerpc/fadump: Add timeout to RTAS busy-wait loops In-Reply-To: <20260406061542.22354-1-litaliano00.contact@gmail.com> Date: Tue, 07 Apr 2026 09:36:50 +0530 Message-ID: References: <20260406061542.22354-1-litaliano00.contact@gmail.com> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list Adriano Vero writes: > 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. Was there an issue which you encountered? Can you share the details of the same please? > > Track the accumulated delay in a total_wait counter and bail out with > -ETIMEDOUT if it reaches RTAS_FADUMP_MAX_WAIT_MS (60 seconds) before > firmware signals completion. This follows the bounded busy-wait pattern > used in rtas-rtc.c. > > Signed-off-by: Adriano Vero