From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D1DEB22AE65; Sun, 1 Mar 2026 01:46:13 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329573; cv=none; b=KjcFU6BIeAOeK4gUAyOkXA9GUrjl73lxp50p8oshJWGFb1qoyp2SrMZwBklN1p6yQT66cKfMMAQog6cT4yWXJZsQCGMxKoq0lrNMVQW/OLllH2YHEM5vcIZ6pAHUrf1NhkskFFJfpxh7jHnVuaicdt7NwVTwVJIQWKJLwTnut+A= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772329573; c=relaxed/simple; bh=ftzj8GHh7m8E+Gc/Njg6CANRxmFUpbpLPuL1d49KtLY=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=gaHdffzy7cb/2ub9gphpJMNaVzTGWsH3jDdaVBuwRHvSQL+osqvifDzj8HXXnuU3YSGN7FF3uE7j3cHNfyB8/jl7fpZseljh5tFQZ/sR26Y5nctzB0mv2pLhmwPcf3R2EpzSDwGwxLuUNw7BRJ5VljADf5f9y9lG5teV/hXiPeA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=FgHmuFkP; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="FgHmuFkP" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C492DC19421; Sun, 1 Mar 2026 01:46:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772329573; bh=ftzj8GHh7m8E+Gc/Njg6CANRxmFUpbpLPuL1d49KtLY=; h=From:To:Cc:Subject:Date:From; b=FgHmuFkPbhau2aaTTP3jPbWhCinc9sY/vpEnBviLq1mLZUpjVs0y1B/TZG9dngkNy kR+kxSi3mviV/eGxk9dXaJA6iRS/W76/Jo/3Yxrqu8jFtMfWQ2Ie/TVF/DdyBnFgdA g+qPk3UtwwYvcztteroJChReh8RbnXxLA/SOoGkjNSeQV37S4fjC1ls9nPgHm7gxkn 05PlUeMDI5sHO8uxO6LeYj2Cdb7nmtz+b9Kd8tULbW2YV6z7fXl+CA7bsABJu84G2Z PwJvPbznYqTYb2HQ8zEL3524ZN0ODlAD57SeW+dQsm0hZr2Nw3Sr2MaGkoMNXbuQkG fF8CJJShOSOJg== From: Sasha Levin To: stable@vger.kernel.org, metze@samba.org Cc: Steve French , Tom Talpey , Long Li , Namjae Jeon , linux-cifs@vger.kernel.org, samba-technical@lists.samba.org, Steve French Subject: FAILED: Patch "smb: client: port and use the wait_for_credits logic used by server" failed to apply to 6.1-stable tree Date: Sat, 28 Feb 2026 20:46:10 -0500 Message-ID: <20260301014610.1709037-1-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: 8bit The patch below does not apply to the 6.1-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha ------------------ original commit in Linus's tree ------------------ >From bb848d205f7ac0141af52a5acb6dd116d9b71177 Mon Sep 17 00:00:00 2001 From: Stefan Metzmacher Date: Thu, 22 Jan 2026 18:16:53 +0100 Subject: [PATCH] smb: client: port and use the wait_for_credits logic used by server This simplifies the logic and prepares the use of smbdirect_send_batch in order to make sure all messages in a multi fragment send are grouped together. We'll add the smbdirect_send_batch processin in a later patch. Cc: # 6.18.x Cc: Steve French Cc: Tom Talpey Cc: Long Li Cc: Namjae Jeon Cc: linux-cifs@vger.kernel.org Cc: samba-technical@lists.samba.org Signed-off-by: Stefan Metzmacher Signed-off-by: Steve French --- fs/smb/client/smbdirect.c | 70 ++++++++++++++++++++++++--------------- 1 file changed, 43 insertions(+), 27 deletions(-) diff --git a/fs/smb/client/smbdirect.c b/fs/smb/client/smbdirect.c index cfbe8ce0db422..405931ce3978f 100644 --- a/fs/smb/client/smbdirect.c +++ b/fs/smb/client/smbdirect.c @@ -1137,6 +1137,44 @@ static int smbd_post_send(struct smbdirect_socket *sc, return rc; } +static int wait_for_credits(struct smbdirect_socket *sc, + wait_queue_head_t *waitq, atomic_t *total_credits, + int needed) +{ + int ret; + + do { + if (atomic_sub_return(needed, total_credits) >= 0) + return 0; + + atomic_add(needed, total_credits); + ret = wait_event_interruptible(*waitq, + atomic_read(total_credits) >= needed || + sc->status != SMBDIRECT_SOCKET_CONNECTED); + + if (sc->status != SMBDIRECT_SOCKET_CONNECTED) + return -ENOTCONN; + else if (ret < 0) + return ret; + } while (true); +} + +static int wait_for_send_lcredit(struct smbdirect_socket *sc) +{ + return wait_for_credits(sc, + &sc->send_io.lcredits.wait_queue, + &sc->send_io.lcredits.count, + 1); +} + +static int wait_for_send_credits(struct smbdirect_socket *sc) +{ + return wait_for_credits(sc, + &sc->send_io.credits.wait_queue, + &sc->send_io.credits.count, + 1); +} + static int smbd_post_send_iter(struct smbdirect_socket *sc, struct iov_iter *iter, int *_remaining_data_length) @@ -1149,41 +1187,19 @@ static int smbd_post_send_iter(struct smbdirect_socket *sc, struct smbdirect_data_transfer *packet; int new_credits = 0; -wait_lcredit: - /* Wait for local send credits */ - rc = wait_event_interruptible(sc->send_io.lcredits.wait_queue, - atomic_read(&sc->send_io.lcredits.count) > 0 || - sc->status != SMBDIRECT_SOCKET_CONNECTED); - if (rc) - goto err_wait_lcredit; - - if (sc->status != SMBDIRECT_SOCKET_CONNECTED) { - log_outgoing(ERR, "disconnected not sending on wait_credit\n"); + rc = wait_for_send_lcredit(sc); + if (rc) { + log_outgoing(ERR, "disconnected not sending on wait_lcredit\n"); rc = -EAGAIN; goto err_wait_lcredit; } - if (unlikely(atomic_dec_return(&sc->send_io.lcredits.count) < 0)) { - atomic_inc(&sc->send_io.lcredits.count); - goto wait_lcredit; - } -wait_credit: - /* Wait for send credits. A SMBD packet needs one credit */ - rc = wait_event_interruptible(sc->send_io.credits.wait_queue, - atomic_read(&sc->send_io.credits.count) > 0 || - sc->status != SMBDIRECT_SOCKET_CONNECTED); - if (rc) - goto err_wait_credit; - - if (sc->status != SMBDIRECT_SOCKET_CONNECTED) { + rc = wait_for_send_credits(sc); + if (rc) { log_outgoing(ERR, "disconnected not sending on wait_credit\n"); rc = -EAGAIN; goto err_wait_credit; } - if (unlikely(atomic_dec_return(&sc->send_io.credits.count) < 0)) { - atomic_inc(&sc->send_io.credits.count); - goto wait_credit; - } request = mempool_alloc(sc->send_io.mem.pool, GFP_KERNEL); if (!request) { -- 2.51.0