From patchwork Tue Mar 5 10:56:24 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wolfram Sang X-Patchwork-Id: 778189 Received: from mail.zeus03.de (www.zeus03.de [194.117.254.33]) (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 7BE995811A for ; Tue, 5 Mar 2024 10:56:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=194.117.254.33 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709636194; cv=none; b=pqrytunwK1AAW339EVx4+zYWI4csHtDWiVSYkfxA12Wm4LjO0cka9CKlMp6KvVq5/nLF8hgLoCTWdC36x9GTPx3pVHexlTBw0tmTzHLMjNMO3Kd7+y2zCFHJVdsHYplydGgS95RJ+oLOpfMUTrSmJV+1C4xU0ttSUo/MkAGche0= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1709636194; c=relaxed/simple; bh=QXDl9xM9tqxHgFDPTmCT4hBXojuNai8u3sev/Ridsgk=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=bqJaduHi8xiLxkPb+TP3OZcZ66FwxEOuREOtIrS9XO5n/yxLvF+iGIQ88pOnZL6yKn5RUxxBghUXJFnZQM0nAR2qjCvPE7bhzMKNQREKxgPQEHE/CYfX+kiRBi1P6YWy++EJdejLWQ61S4Tz/mcGA2Ym6Skd8Xw2xNqkuKmk0TU= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com; spf=pass smtp.mailfrom=sang-engineering.com; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b=fQeUxQhG; arc=none smtp.client-ip=194.117.254.33 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sang-engineering.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=sang-engineering.com header.i=@sang-engineering.com header.b="fQeUxQhG" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= sang-engineering.com; h=from:to:cc:subject:date:message-id :mime-version:content-transfer-encoding; s=k1; bh=9vtX0y6MGSwbev WbXEHzzpxjbAsk2wCJm/2gzbK8mwg=; b=fQeUxQhGMveW+vzM5FDxaBVyvV+HmP TDV/ytKReSPdpHIu2PYIkkhABleQVpyvymOOIgMGWnL7XlGubvT0O4YjBNelijWl guxOeSXzCvoMyuAGNsWOcljK9ULcg6XArW2lI4GI2I20XIPyJiWcEiRb9//XP9nH 5+RPT2VdtWnIUiXPctJB9ZCaR8xI3CJa6j3317U1Wy4OlCUAMcf+sbpVExBdtFKq hA6K6DlWBweJRyB2229hq/jP2PjIwDJWCU8vL9bxfTFv2kH4C6XB0kEYPck8OAy7 9R/oiYWAUwEIci9/LXMJ48QrNq32r9uj/BEGfwfW/xHuX5hjKAQgThlg== Received: (qmail 3848119 invoked from network); 5 Mar 2024 11:56:30 +0100 Received: by mail.zeus03.de with ESMTPSA (TLS_AES_256_GCM_SHA384 encrypted, authenticated); 5 Mar 2024 11:56:30 +0100 X-UD-Smtp-Session: l3s3148p1@19vMsecS0pIgAwDPXyskAOYD60938Lkb From: Wolfram Sang To: linux-renesas-soc@vger.kernel.org Cc: Dirk Behme , Wolfram Sang , Ulf Hansson , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH] mmc: tmio: comment the ERR_PTR usage in this driver Date: Tue, 5 Mar 2024 11:56:24 +0100 Message-ID: <20240305105623.3379-2-wsa+renesas@sang-engineering.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-mmc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 It is not super obvious why the driver sometimes uses an ERR_PTR for the current mrq. Explain why in comments. Signed-off-by: Wolfram Sang --- drivers/mmc/host/tmio_mmc_core.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/mmc/host/tmio_mmc_core.c b/drivers/mmc/host/tmio_mmc_core.c index c253d176db69..93e912afd3ae 100644 --- a/drivers/mmc/host/tmio_mmc_core.c +++ b/drivers/mmc/host/tmio_mmc_core.c @@ -972,6 +972,7 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) return; } + /* Disallow new mrqs and work handlers to run */ host->mrq = ERR_PTR(-EBUSY); spin_unlock_irqrestore(&host->lock, flags); @@ -1006,8 +1007,9 @@ static void tmio_mmc_set_ios(struct mmc_host *mmc, struct mmc_ios *ios) "%s.%d: IOS interrupted: clk %u, mode %u", current->comm, task_pid_nr(current), ios->clock, ios->power_mode); - host->mrq = NULL; + /* Ready for new mrqs */ + host->mrq = NULL; host->clk_cache = ios->clock; mutex_unlock(&host->ios_lock);